GeneralsZeroHour/Generals/Code/Libraries/Source/WWVegas/WW3D2/mesh.cpp

/*
**	Command & Conquer Generals(tm)
**	Copyright 2025 Electronic Arts Inc.
**
**	This program is free software: you can redistribute it and/or modify
**	it under the terms of the GNU General Public License as published by
**	the Free Software Foundation, either version 3 of the License, or
**	(at your option) any later version.
**
**	This program is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**	GNU General Public License for more details.
**
**	You should have received a copy of the GNU General Public License
**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/* $Header: /VSS_Sync/ww3d2/mesh.cpp 56    8/29/01 9:50p Vss_sync $ */
/*********************************************************************************************** 
 ***                            Confidential - Westwood Studios                              *** 
 *********************************************************************************************** 
 *                                                                                             * 
 *                 Project Name : Commando / G 3D engine                                       * 
 *                                                                                             * 
 *                    File Name : MESH.CPP                                                     * 
 *                                                                                             * 
 *                   Programmer : Greg Hjelstrom                                               * 
 *                                                                                             * 
 *                   Start Date : 06/11/97                                                     * 
 *                                                                                             * 
 *                  Last Update : June 12, 1997 [GH]                                           * 
 *                                                                                             * 
 *---------------------------------------------------------------------------------------------* 
 * Functions:                                                                                  * 
 *   MeshClass::MeshClass -- Constructor for MeshClass                                         *
 *   MeshClass::MeshClass -- Copy Constructor for MeshClass                                    *
 *	  MeshClass::operator == -- assignment operator for MeshClass                               *
 *   MeshClass::~MeshClass -- destructor                                                       *
 *   MeshClass::Contains -- Determines whether mesh contains a (worldspace) point.             *
 *   MeshClass::Free -- Releases all memory/assets in use by this mesh                         *
 *   MeshClass::Clone -- Creates a clone of this mesh                                          *
 *   MeshClass::Get_Name -- returns the name of the mesh                                       *
 *   MeshClass::Set_Name -- sets the name of this mesh                                         *
 *   MeshClass::Get_W3D_Flags -- access to the W3D flags                                       *
 *   MeshClass::Get_User_Text -- access to the text buffer                                     *
 *   MeshClass::Scale -- Scales the mesh                                                       *
 *   MeshClass::Scale -- Scales the mesh                                                       *
 *   MeshClass::Init -- Init the mesh from a MeshBuilder object                                *
 *   MeshClass::Load -- creates a mesh out of a mesh chunk in a .w3d file                      * 
 *   MeshClass::Cast_Ray -- compute a ray intersection with this mesh                          *
 *   MeshClass::Cast_AABox -- cast an AABox against this mesh                                  *
 *   MeshClass::Cast_OBBox -- Cast an obbox against this mesh                                  *
 *   MeshClass::Intersect_AABox -- test for intersection with given AABox                      *
 *   MeshClass::Intersect_OBBox -- test for intersection with the given OBBox                  *
 *   MeshClass::Generate_Culling_Tree -- Generates a hierarchical culling tree for the mesh    *
 *   MeshClass::Direct_Load -- read the w3d file directly into this mesh object                *
 *   MeshClass::read_chunks -- read all of the chunks from the .wtm file                       * 
 *	  MeshClass::read_vertices -- reads the vertex chunk                                        * 
 *   MeshClass::read_texcoords -- read in the texture coordinates chunk                        *
 *   MeshClass::install_texture_coordinates -- installs the given u-v's in each channel that is*
 *   MeshClass::read_vertex_normals -- reads a surrender normal chunk from the wtm file        * 
 *   MeshClass::read_v3_materials -- Reads in version 3 materials.                             *
 *   MeshClass::read_map -- Reads definition of a texture map from the file                    *
 *   MeshClass::read_triangles -- read the triangles chunk                                     *
 *   MeshClass::read_per_tri_materials -- read the material indices for each triangle          *
 *   MeshClass::read_user_text -- read in the user text chunk                                  * 
 *   MeshClass::read_vertex_colors -- read in the vertex colors chunk                          * 
 *   MeshClass::read_vertex_influences -- read in the vertex influences chunk                  * 
 *   MeshClass::Get_Material_Info -- returns a pointer to the material info                    *
 *   MeshClass::Create_Decal -- creates a decal on this mesh                                   *
 *   MeshClass::Delete_Decal -- removes a decal from this mesh                                 *
 *   MeshClass::Get_Num_Polys -- returns the number of polys (tris) in this mesh               *
 *   MeshClass::Render -- renders this mesh                                                    *
 *   MeshClass::Special_Render -- special render function for meshes                           *
 *   MeshClass::update_skin -- deforms the mesh                                                *
 *   MeshClass::clone_materials -- clone the materials for this mesh                           *
 *   MeshClass::install_materials -- transfers the materials into the mesh                     *
 *   MeshClass::Get_Model -- user access to the mesh model                                     *
 *   MeshClass::Get_Obj_Space_Bounding_Sphere -- returns obj-space bounding sphere             *
 *   MeshClass::Get_Obj_Space_Bounding_Box -- returns the obj-space bounding box               *
 *   MeshClass::Get_Deformed_Vertices -- Gets the deformed vertices for a skin                 *
 *   MeshClass::Get_Deformed_Vertices -- Gets the deformed vertices for a skin                 *
 *   MeshClass::Render_Material_Pass -- Render a procedural material pass for this mesh        *
 *   MeshClass::Replace_VertexMaterial -- Replaces existing vertex material with a new one. Wi *
 *   MeshClass::Make_Unique -- Makes mesh unique in the renderer, but still shares system ram  *
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

#include "mesh.h"
#include <assert.h>
#include <string.h>
#include "w3d_file.h"
#include "assetmgr.h"
#include "w3derr.h"
#include "wwdebug.h"
#include "vertmaterial.h"
#include "shader.h"
#include "matinfo.h"
#include "htree.h"
#include "meshbuild.h"
#include "tri.h"
#include "aaplane.h"
#include "aabtree.h"
#include "chunkio.h"
#include "w3d_util.h"
#include "meshmdl.h"
#include "meshgeometry.h"
#include "ww3d.h"
#include "camera.h"
#include "texture.h"
#include "rinfo.h"
#include "coltest.h"
#include "inttest.h"
#include "decalmsh.h"
#include "decalsys.h"
#include "dx8polygonrenderer.h"
#include "dx8indexbuffer.h"
#include "dx8renderer.h"
#include "visrasterizer.h"
#include "wwmemlog.h"
#include <stdio.h>


bool MeshClass::Legacy_Meshes_Fogged = true;

/*
** This #define causes the collision code to always recompute the triangle normals rather
** than using the ones in the model. 
** TODO: ensure that the models have unit normals and start re-using them again or write
** collision code to handle non-unit normals!
*/
#if (OPTIMIZE_PLANEEQ_RAM)
#define COMPUTE_NORMALS
#endif


/*
** Temporary storage used during decal creation
*/
static DynamicVectorClass<Vector3>	_TempVertexBuffer;


/***********************************************************************************************
 * MeshClass::MeshClass -- Constructor for MeshClass                                           *
 *                                                                                             *
 *    Initializes an empty mesh class                                                          *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
MeshClass::MeshClass(void) :
	Model(NULL),
	DecalMesh(NULL),
	LightEnvironment(NULL),
	BaseVertexOffset(0),
	NextVisibleSkin(NULL),
	m_alphaOverride(1.0f),
	m_materialPassAlphaOverride(1.0f),
	m_materialPassEmissiveOverride(1.0f)
{
}


/***********************************************************************************************
 * MeshClass::MeshClass -- Copy Constructor for MeshClass                                      *
 *                                                                                             *
 *    Creates a mesh which is a copy of the given mesh                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *=============================================================================================*/
MeshClass::MeshClass(const MeshClass & that) :
	RenderObjClass(that),
	Model(NULL),
	DecalMesh(NULL),
	LightEnvironment(NULL),
	BaseVertexOffset(that.BaseVertexOffset),
	NextVisibleSkin(NULL),
	m_alphaOverride(1.0f),
	m_materialPassAlphaOverride(1.0f),
	m_materialPassEmissiveOverride(1.0f)
{
	REF_PTR_SET(Model,that.Model);					// mesh instances share models by default
}


/***********************************************************************************************
 * operator == -- assignment operator for MeshClass                                            *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
MeshClass & MeshClass::operator = (const MeshClass & that)
{
	if (this != &that) {

		RenderObjClass::operator = (that);

		REF_PTR_SET(Model,that.Model);				// mesh instances share models by default
		BaseVertexOffset = that.BaseVertexOffset;

		// just dont copy the decals or light environment
		REF_PTR_RELEASE(DecalMesh);
		LightEnvironment = NULL;
	}
	return * this;
}


/***********************************************************************************************
 * MeshClass::~MeshClass -- destructor                                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
MeshClass::~MeshClass(void) 
{
	Free();
}


/***********************************************************************************************
 * MeshClass::Contains -- Determines whether mesh contains a (worldspace) point.               *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS: Assumes mesh is a closed manifold - results are undefined otherwise               *
 *           This function will NOT work for skins                                             *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   8/30/00     NH : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Contains(const Vector3 &point)
{
	// Transform point to object space and pass on to model
	Vector3 obj_point;
	Matrix3D::Inverse_Transform_Vector(Transform, point, &obj_point);
	return Model->Contains(obj_point);
}


/***********************************************************************************************
 * MeshClass::Free -- Releases all memory/assets in use by this mesh                           *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Free(void)
{
	REF_PTR_RELEASE(Model);
	REF_PTR_RELEASE(DecalMesh);
}


/***********************************************************************************************
 * MeshClass::Clone -- Creates a clone of this mesh                                            *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
RenderObjClass * MeshClass::Clone(void) const
{
	return NEW_REF( MeshClass, (*this));
}


/***********************************************************************************************
 * MeshClass::Get_Name -- returns the name of the mesh                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   5/15/98    GTH : Created.                                                                 *
 *=============================================================================================*/
const char * MeshClass::Get_Name(void) const
{ 
	return Model->Get_Name(); 
}


/***********************************************************************************************
 * MeshClass::Set_Name -- sets the name of this mesh                                           *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   3/9/99     GTH : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Set_Name(const char * name)
{
	Model->Set_Name(name);
}

/***********************************************************************************************
 * MeshClass::Get_W3D_Flags -- access to the W3D flags                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   5/15/98    GTH : Created.                                                                 *
 *=============================================================================================*/
uint32 MeshClass::Get_W3D_Flags(void)
{ 
	return Model->W3dAttributes; 
}


/***********************************************************************************************
 * MeshClass::Get_User_Text -- access to the text buffer                                       *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   5/15/98    GTH : Created.                                                                 *
 *=============================================================================================*/
const char * MeshClass::Get_User_Text(void) const
{ 
	return Model->Get_User_Text(); 
}		


/***********************************************************************************************
 * MeshClass::Get_Material_Info -- returns a pointer to the material info                      *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   5/20/98    GTH : Created.                                                                 *
 *=============================================================================================*/
MaterialInfoClass * MeshClass::Get_Material_Info(void)
{ 
	if (Model) {
		if (Model->MatInfo) {
			Model->MatInfo->Add_Ref();
			return Model->MatInfo; 
		}
	}
	return NULL;
}


/***********************************************************************************************
 * MeshClass::Get_Model -- user access to the mesh model                                       *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   2/4/99     GTH : Created.                                                                 *
 *=============================================================================================*/
MeshModelClass * MeshClass::Get_Model(void)
{
	if (Model != NULL) {
		Model->Add_Ref();
	}
	return Model;
}

/***********************************************************************************************
 * MeshClass::Scale -- Scales the mesh                                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *=============================================================================================*/
void MeshClass::Scale(float scale)
{
	if (scale==1.0f) return;

	Vector3 sc;
	sc.X = sc.Y = sc.Z = scale;
	Make_Unique();
	Model->Make_Geometry_Unique();
	Model->Scale(sc);
	
   Invalidate_Cached_Bounding_Volumes();

   // Now update the object space bounding volumes of this object's container:
   RenderObjClass *container = Get_Container();
   if (container) container->Update_Obj_Space_Bounding_Volumes();
}


/***********************************************************************************************
 * MeshClass::Scale -- Scales the mesh                                                         *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *   12/8/98    GTH : Modified the box scaling to use the non-uniform parameters               *
 *=============================================================================================*/
void MeshClass::Scale(float scalex, float scaley, float scalez)
{
	// scale the surrender mesh model
	Vector3 sc;
	sc.X = scalex;
	sc.Y = scaley;
	sc.Z = scalez;
	Make_Unique();
	Model->Make_Geometry_Unique();
	Model->Scale(sc);
	
   Invalidate_Cached_Bounding_Volumes();

   // Now update the object space bounding volumes of this object's container:
   RenderObjClass *container = Get_Container();
   if (container) container->Update_Obj_Space_Bounding_Volumes();
}


/***********************************************************************************************
 * MeshClass::Get_Deformed_Vertices -- Gets the deformed vertices for a skin                   *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   3/4/2001   gth : Created.                                                                 *
 *=============================================================================================*/
void	MeshClass::Get_Deformed_Vertices(Vector3 *dst_vert, Vector3 *dst_norm)
{
	WWASSERT(Model->Get_Flag(MeshGeometryClass::SKIN));
	Model->get_deformed_vertices(dst_vert,dst_norm,Container->Get_HTree());
}


/***********************************************************************************************
 * MeshClass::Get_Deformed_Vertices -- Gets the deformed vertices for a skin                   *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   3/4/2001   gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Get_Deformed_Vertices(Vector3 *dst_vert)
{
	WWASSERT(Model->Get_Flag(MeshGeometryClass::SKIN));
	WWASSERT(Container != NULL);
	WWASSERT(Container->Get_HTree() != NULL);

	Model->get_deformed_vertices(dst_vert,Container->Get_HTree());
}

void MeshClass::Compose_Deformed_Vertex_Buffer(
	VertexFormatXYZNDUV2* verts,
	const Vector2* uv0,
	const Vector2* uv1,
	const unsigned* diffuse)
{
	WWASSERT(Model->Get_Flag(MeshGeometryClass::SKIN));
	Model->compose_deformed_vertex_buffer(verts,uv0,uv1,diffuse,Container->Get_HTree());
}

/***********************************************************************************************
 * MeshClass::Create_Decal -- creates a decal on this mesh                                     *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/26/00    gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Create_Decal(DecalGeneratorClass * generator)
{
	WWMEMLOG(MEM_GEOMETRY);

	if (WW3D::Are_Decals_Enabled() == false) {
		return;
	}

	if (Is_Translucent() && (generator->Is_Applied_To_Translucent_Meshes() == false)) {
		return;
	}
	
	if (!Model->Get_Flag(MeshGeometryClass::SKIN)) {
		
		// Rigid mesh
		Matrix3D modeltm_inv;
		OBBoxClass localbox;

		Get_Transform().Get_Orthogonal_Inverse(modeltm_inv);
		OBBoxClass::Transform(modeltm_inv, generator->Get_Bounding_Volume(), &localbox);

		// generate apt, if it is not empty, add a decal.
		SimpleDynVecClass<uint32> apt;
		Model->Generate_Rigid_APT(localbox, apt);
		
		if (apt.Count() > 0) {
			if (DecalMesh == NULL) {
				DecalMesh =		NEW_REF(RigidDecalMeshClass, (this, generator->Peek_Decal_System()));
			}
			DecalMesh->Create_Decal(generator, localbox, apt);
		}

	} else {
		
		WWDEBUG_SAY(("PERFORMANCE WARNING: Decal being applied to a SKIN mesh!\r\n"));

		// Skin
		// The deformed worldspace vertices are used both for the APT and in Create_Decal() to
		// generate the texture coordinates.
		int vertex_count = Model->Get_Vertex_Count();
		if (_TempVertexBuffer.Count() < vertex_count) _TempVertexBuffer.Resize(vertex_count);
		Vector3 *dst_vert = &(_TempVertexBuffer[0]);
		Get_Deformed_Vertices(dst_vert);

		// generate apt, if it is not empty, add a decal.
		SimpleDynVecClass<uint32> apt;

		OBBoxClass worldbox = generator->Get_Bounding_Volume();

		// We compare the worldspace box vs. the worldspace vertices
		Model->Generate_Skin_APT(worldbox, apt, dst_vert);
		
		// if it is not empty, add a decal
		if (apt.Count() > 0) {
			if (DecalMesh == NULL) {
				DecalMesh = NEW_REF(SkinDecalMeshClass, (this, generator->Peek_Decal_System()));
			}
			DecalMesh->Create_Decal(generator, worldbox, apt, &_TempVertexBuffer);
		}
	}
}


/***********************************************************************************************
 * MeshClass::Delete_Decal -- removes a decal from this mesh                                   *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/26/00    gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Delete_Decal(uint32 decal_id)
{
	if (DecalMesh != NULL) {
		DecalMesh->Delete_Decal(decal_id);
	}
}


/***********************************************************************************************
 * MeshClass::Get_Num_Polys -- returns the number of polys (tris) in this mesh                 *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/6/98     GTH : Created.                                                                 *
 *=============================================================================================*/
int MeshClass::Get_Num_Polys(void) const
{
	if (Model) {
		return Model->Get_Polygon_Count();
	} else {
		return 0;
	}
}

/***********************************************************************************************
 * MeshClass::Render -- renders this mesh                                                      *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   12/10/98   GTH : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Render(RenderInfoClass & rinfo)
{
	if (Is_Not_Hidden_At_All() == false) {
		return;
	}

	// If static sort lists are enabled and this mesh has a sort level, put it on the list instead
	// of rendering it.
	unsigned int sort_level = (unsigned int)Model->Get_Sort_Level();

	if (WW3D::Are_Static_Sort_Lists_Enabled() && sort_level != SORT_LEVEL_NONE) {

		Set_Lighting_Environment(rinfo.light_environment);
		//Add custom alpha
		m_alphaOverride = rinfo.alphaOverride;
		m_materialPassAlphaOverride = rinfo.materialPassAlphaOverride;
		m_materialPassEmissiveOverride = rinfo.materialPassEmissiveOverride;

		WW3D::Add_To_Static_Sort_List(this, sort_level);

	} else {

		const FrustumClass & frustum=rinfo.Camera.Get_Frustum();

		if (	Model->Get_Flag(MeshGeometryClass::SKIN) ||
				CollisionMath::Overlap_Test(frustum,Get_Bounding_Box())!=CollisionMath::OUTSIDE ) 
		{
			bool rendered_something = false;
			
			/*
			** If this mesh model has never been rendered, we need to generate the DX8 datastructures
			*/
			if (Model->PolygonRendererList.Is_Empty()) {
				Model->Register_For_Rendering();
				WWASSERT(!Model->PolygonRendererList.Is_Empty());
			}

			/*
			** Plug in lighting
			*/
			if (sort_level == SORT_LEVEL_NONE)	//sorting ones get their environment set above.
			{	Set_Lighting_Environment(rinfo.light_environment);
				//Add custom alpha
				m_alphaOverride = rinfo.alphaOverride;
				m_materialPassAlphaOverride = rinfo.materialPassAlphaOverride;
				m_materialPassEmissiveOverride = rinfo.materialPassEmissiveOverride;
			}

			/*
			** Process texture reductions:
			*/
//			Model->Process_Texture_Reduction();

			/*
			** Look up the FVF container that this mesh is in
			** TODO: make this a little nicer?
			*/
			DX8FVFCategoryContainer * fvf_container = Model->PolygonRendererList.Peek_Head()->Get_Texture_Category()->Get_Container();
			if ((rinfo.Current_Override_Flags() & RenderInfoClass::RINFO_OVERRIDE_ADDITIONAL_PASSES_ONLY) == 0) {

				/*
				** Link each polygon renderer for this mesh into the visible list
				*/
				DX8PolygonRendererListIterator it(&(Model->PolygonRendererList));
				while (!it.Is_Done()) {
					DX8PolygonRendererClass* polygon_renderer=it.Peek_Obj();
					polygon_renderer->Get_Texture_Category()->Add_Render_Task(polygon_renderer,this);
					it.Next();
				}

				rendered_something = true;

			}

			/*
			** If the rendering context specifies procedural material passes, register them
			** for rendering
			*/
			for (int i=0; i<rinfo.Additional_Pass_Count(); i++) {
				
				MaterialPassClass * matpass = rinfo.Peek_Additional_Pass(i);

				if ((!Is_Translucent()) || (matpass->Is_Enabled_On_Translucent_Meshes())) {
					fvf_container->Add_Visible_Material_Pass(matpass,this);
					rendered_something = true;
				}
			}

			/*
			** If we rendered any base or procedural passes and this is a skin, we need
			** to tell the mesh rendering system to process this skin
			*/
			if (rendered_something && Model->Get_Flag(MeshGeometryClass::SKIN)) {
				//WWASSERT(dynamic_cast<DX8SkinFVFCategoryContainer *>(fvf_container) != NULL);
				static_cast<DX8SkinFVFCategoryContainer*>(fvf_container)->Add_Visible_Skin(this);
			}

			/*
			** If we have a decal mesh, link it into the mesh rendering system
			*/
			if (DecalMesh != NULL) {
				const SphereClass & ws_sphere = Get_Bounding_Sphere();
				Vector3 cam_space_sphere_center;
				rinfo.Camera.Transform_To_View_Space(cam_space_sphere_center,ws_sphere.Center);
				if (-cam_space_sphere_center.Z - ws_sphere.Radius < WW3D::Get_Decal_Rejection_Distance()) {
					TheDX8MeshRenderer.Add_To_Render_List(DecalMesh);
				}
			}
		}
	}
}


/***********************************************************************************************
 * MeshClass::Render_Material_Pass -- Render a procedural material pass for this mesh          *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   3/4/2001   gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Render_Material_Pass(MaterialPassClass * pass,IndexBufferClass * ib)
{
	//Added to allow dynamic opacity on additional render passed
	//without having to create a new material pass per object instance. -MW
	float oldOpacity=-1.0f;
	Vector3 oldEmissive(-1,-1,-1);

	if (LightEnvironment != NULL) {
		DX8Wrapper::Set_Light_Environment(LightEnvironment);
	}

	if (Model->Get_Flag(MeshModelClass::SKIN)) {

		/*
		** In the case of skin meshes, we need to render our polys with the identity transform
		*/
		if (m_materialPassAlphaOverride != 1.0f)
		{	VertexMaterialClass *mat=pass->Peek_Material();
			if (mat)
			{
				oldOpacity=mat->Get_Opacity();
				mat->Set_Opacity(m_materialPassAlphaOverride);
			}
		}
		if (m_materialPassEmissiveOverride != 1.0f)
		{	VertexMaterialClass *mat=pass->Peek_Material();
			if (mat)
			{
				mat->Get_Emissive(&oldEmissive);
				mat->Set_Emissive(m_materialPassEmissiveOverride*oldEmissive);
			}
		}
		pass->Install_Materials();
		DX8Wrapper::Set_Index_Buffer(ib,0);

		SNAPSHOT_SAY(("Set_World_Identity\n"));
		DX8Wrapper::Set_World_Identity();

		DX8PolygonRendererListIterator it(&Model->PolygonRendererList);
		while (!it.Is_Done()) {
			if (it.Peek_Obj()->Get_Pass() == 0)
				it.Peek_Obj()->Render(BaseVertexOffset);
			it.Next();
		}

		if (oldOpacity >= 0)
		{	//opacity was modified for this mesh instance, so need to restore the material setting which may be shared
			//among other instances.
			pass->Peek_Material()->Set_Opacity(oldOpacity);
		}
		if (oldEmissive.X >= 0)
		{	//emissive was modified for this mesh instance, so need to restore the material setting which may be shared
			//among other instances.
			pass->Peek_Material()->Set_Emissive(oldEmissive);
		}
		//MW: Need uninstall custom materials in case they leave D3D in unknown state
		pass->UnInstall_Materials();

	} else if ((pass->Get_Cull_Volume() != NULL) && (MaterialPassClass::Is_Per_Polygon_Culling_Enabled())) {
		
		/*
		** Generate the APT 
		*/
		static SimpleDynVecClass<uint32> _apt;
		_apt.Delete_All(false);
			
		Matrix3D modeltminv;
		Get_Transform().Get_Orthogonal_Inverse(modeltminv);
		
		OBBoxClass localbox;
		OBBoxClass::Transform(modeltminv,*(pass->Get_Cull_Volume()),&localbox);

		Vector3 view_dir;
		localbox.Basis.Get_Z_Vector(&view_dir);
		view_dir = -view_dir;
			
		if (Model->Has_Cull_Tree()) {
			Model->Generate_Rigid_APT(localbox,view_dir,_apt);
		} else {
			Model->Generate_Rigid_APT(view_dir,_apt);
		}
	
		if (_apt.Count() > 0) {

			int buftype = BUFFER_TYPE_DYNAMIC_DX8;
			if (Model->Get_Flag(MeshGeometryClass::SORT) && WW3D::Is_Sorting_Enabled()) {
				buftype = BUFFER_TYPE_DYNAMIC_SORTING;
			}

			/*
			** Spew triangles in the APT into the dynamic index buffer
			*/
			int min_v = Model->Get_Vertex_Count();
			int max_v = 0;

			DynamicIBAccessClass dynamic_ib(buftype,_apt.Count() * 3);
			{
				DynamicIBAccessClass::WriteLockClass lock(&dynamic_ib);
				unsigned short * indices = lock.Get_Index_Array();
				const Vector3i * polys = Model->Get_Polygon_Array();

				for (int i=0; i < _apt.Count(); i++)
				{
					unsigned v0 = polys[_apt[i]].I;
					unsigned v1 = polys[_apt[i]].J;
					unsigned v2 = polys[_apt[i]].K;

					indices[i*3 + 0] = (unsigned short)v0;
					indices[i*3 + 1] = (unsigned short)v1;
					indices[i*3 + 2] = (unsigned short)v2;

					min_v = WWMath::Min(v0,min_v);
					min_v = WWMath::Min(v1,min_v);
					min_v = WWMath::Min(v2,min_v);

					max_v = WWMath::Max(v0,max_v);
					max_v = WWMath::Max(v1,max_v);
					max_v = WWMath::Max(v2,max_v);
				}
			}

			/*
			** Render
			*/
			int vertex_offset = Model->PolygonRendererList.Peek_Head()->Get_Vertex_Offset();
			pass->Install_Materials();
			
			DX8Wrapper::Set_Transform(D3DTS_WORLD,Get_Transform());
			DX8Wrapper::Set_Index_Buffer(dynamic_ib,vertex_offset);

			DX8Wrapper::Draw_Triangles(
				0,
				_apt.Count(),
				min_v,
				max_v-min_v+1);
			//MW: Need uninstall custom materials in case they leave D3D in unknown state
			pass->UnInstall_Materials();
		}
	} else {		
		
		/*
		** Normal mesh case, render polys with this mesh's transform
		*/
		if (m_materialPassAlphaOverride != 1.0f)
		{	VertexMaterialClass *mat=pass->Peek_Material();
			if (mat)
			{
				oldOpacity=mat->Get_Opacity();
				mat->Set_Opacity(m_materialPassAlphaOverride);
			}
		}
		if (m_materialPassEmissiveOverride != 1.0f)
		{	VertexMaterialClass *mat=pass->Peek_Material();
			if (mat)
			{
				mat->Get_Emissive(&oldEmissive);
				mat->Set_Emissive(m_materialPassEmissiveOverride*oldEmissive);
			}
		}
		pass->Install_Materials();
		DX8Wrapper::Set_Index_Buffer(ib,0);

		SNAPSHOT_SAY(("Set_World_Transform\n"));
		DX8Wrapper::Set_Transform(D3DTS_WORLD,Transform);

		DX8PolygonRendererListIterator it(&Model->PolygonRendererList);
		while (!it.Is_Done()) {

			if (it.Peek_Obj()->Get_Pass() == 0)
				it.Peek_Obj()->Render(BaseVertexOffset);
			it.Next();
		}
		
		if (oldOpacity >= 0)
		{	//opacity was modified for this mesh instance, so need to restore the material setting which may be shared
			//among other instances.
			pass->Peek_Material()->Set_Opacity(oldOpacity);
		}
		if (oldEmissive.X >= 0)
		{	//emissive was modified for this mesh instance, so need to restore the material setting which may be shared
			//among other instances.
			pass->Peek_Material()->Set_Emissive(oldEmissive);
		}
		//MW: Need uninstall custom materials in case they leave D3D in unknown state
		pass->UnInstall_Materials();
	}
}


/***********************************************************************************************
 * MeshClass::Special_Render -- special render function for meshes                             *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   12/10/98   GTH : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Special_Render(SpecialRenderInfoClass & rinfo)
{
	if ((Is_Not_Hidden_At_All() == false) && (rinfo.RenderType != SpecialRenderInfoClass::RENDER_SHADOW)) {
		return;
	}
	
	if (rinfo.RenderType == SpecialRenderInfoClass::RENDER_VIS) {
	
		WWASSERT(rinfo.VisRasterizer != NULL);
		if (Model->Get_Flag(MeshModelClass::SKIN) == 0) {

			rinfo.VisRasterizer->Set_Model_Transform(Transform);
			rinfo.VisRasterizer->Render_Triangles(	Model->Get_Vertex_Array(),
																Model->Get_Vertex_Count(),
																Model->Get_Polygon_Array(),
																Model->Get_Polygon_Count(),
																Get_Bounding_Box() );
		} else {

			int vertex_count = Model->Get_Vertex_Count();
			if (_TempVertexBuffer.Count() < vertex_count) _TempVertexBuffer.Resize(vertex_count);
			Vector3 *dst_vert = &(_TempVertexBuffer[0]);
			Get_Deformed_Vertices(dst_vert);

			rinfo.VisRasterizer->Set_Model_Transform(Matrix3D::Identity);
			rinfo.VisRasterizer->Render_Triangles(	dst_vert,
																Model->Get_Vertex_Count(),
																Model->Get_Polygon_Array(),
																Model->Get_Polygon_Count(),
																Get_Bounding_Box() );
		}
	}

	if (rinfo.RenderType == SpecialRenderInfoClass::RENDER_SHADOW) {
		const HTreeClass * htree = NULL;
		if (Container!=NULL) {
			htree = Container->Get_HTree();
		}
		Model->Shadow_Render(rinfo,Transform,htree);
	}
}

void MeshClass::Replace_Texture(TextureClass* texture,TextureClass* new_texture)
{
	Model->Replace_Texture(texture,new_texture);
}


/***********************************************************************************************
 * MeshClass::Replace_VertexMaterial -- Replaces existing vertex material with a new one. Will *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   4/2/2001   hy : Created.                                                                  *
 *=============================================================================================*/
void MeshClass::Replace_VertexMaterial(VertexMaterialClass* vmat,VertexMaterialClass* new_vmat)
{
	Model->Replace_VertexMaterial(vmat,new_vmat);
}


/***********************************************************************************************
 * MeshClass::Make_Unique -- Makes mesh unique in the renderer, but still shares system ram ge *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   4/2/2001   hy : Created.                                                                  *
 *=============================================================================================*/
void MeshClass::Make_Unique()
{
	if (Model->Num_Refs()==1) return;

	MeshModelClass *newmesh=NEW_REF(MeshModelClass,(*Model));
	REF_PTR_SET(Model,newmesh);
	REF_PTR_RELEASE(newmesh);
}

/*********************************************************************************************** 
 * MeshClass::Load -- creates a mesh out of a mesh chunk in a .w3d file                        * 
 *                                                                                             * 
 * INPUT:                                                                                      * 
 * 																														  * 
 * OUTPUT:                                                                                     * 
 *                                                                                             * 
 * WARNINGS:                                                                                   * 
 *                                                                                             * 
 * HISTORY:                                                                                    * 
 *   06/12/1997 GH  : Created.                                                                 * 
 *=============================================================================================*/
WW3DErrorType MeshClass::Load_W3D(ChunkLoadClass & cload)
{
	Vector3 boxmin,boxmax;

	/*
	** Make sure this mesh is "empty"
	*/
	Free();

	/*
	** Create empty MaterialInfo and Model
	*/
	Model = NEW_REF(MeshModelClass,());
	if (Model == NULL) {
		WWDEBUG_SAY(("MeshClass::Load - Failed to allocate model\r\n"));
		return WW3D_ERROR_LOAD_FAILED;
	}

	/*
	** Create and read in the model...
	*/
	if (Model->Load_W3D(cload) != WW3D_ERROR_OK) {
		Free();
		return WW3D_ERROR_LOAD_FAILED;
	}

	/*
	** Pull interesting stuff out of the w3d attributes bits
	*/
	int col_bits = (Model->W3dAttributes & W3D_MESH_FLAG_COLLISION_TYPE_MASK) >> W3D_MESH_FLAG_COLLISION_TYPE_SHIFT;
	Set_Collision_Type( col_bits << 1 );
	Set_Hidden(Model->W3dAttributes & W3D_MESH_FLAG_HIDDEN);
	
	/*
	** Indicate whether this mesh is translucent.  The mesh is considered translucent
	** if sorting has been enabled (alpha blending on pass 0) or if pass0 contains alpha-test.
	** This flag is mainly being used by visibility preprocessing code in Renegade.
	*/
	int is_translucent = Model->Get_Flag(MeshModelClass::SORT);
	int is_alpha = 0;	//keep track of alpha pieces that require sorting (including static sort lists).
	int is_additive = 0;

	if (Model->Has_Shader_Array(0)) {
		for (int i=0; i<Model->Get_Polygon_Count(); i++) {
			is_translucent |= (Model->Get_Shader(i,0).Get_Alpha_Test() == ShaderClass::ALPHATEST_ENABLE);
			is_alpha |= (Model->Get_Shader(i,0).Get_Dst_Blend_Func() != ShaderClass::DSTBLEND_ZERO ||
									Model->Get_Shader(i,0).Get_Src_Blend_Func() != ShaderClass::SRCBLEND_ONE) && (Model->Get_Shader(i,0).Get_Alpha_Test() != ShaderClass::ALPHATEST_ENABLE);
			is_additive |= (Model->Get_Shader(i,0).Get_Dst_Blend_Func() == ShaderClass::DSTBLEND_ONE &&
									Model->Get_Shader(i,0).Get_Src_Blend_Func() == ShaderClass::SRCBLEND_ONE);
		}
	} else {
		is_translucent |= (Model->Get_Single_Shader(0).Get_Alpha_Test() == ShaderClass::ALPHATEST_ENABLE);
		is_alpha |= (Model->Get_Single_Shader(0).Get_Dst_Blend_Func() != ShaderClass::DSTBLEND_ZERO ||
									Model->Get_Single_Shader(0).Get_Src_Blend_Func() != ShaderClass::SRCBLEND_ONE) && (Model->Get_Single_Shader(0).Get_Alpha_Test() != ShaderClass::ALPHATEST_ENABLE);
		is_additive |= (Model->Get_Single_Shader(0).Get_Dst_Blend_Func() == ShaderClass::DSTBLEND_ONE &&
									Model->Get_Single_Shader(0).Get_Src_Blend_Func() == ShaderClass::SRCBLEND_ONE);
	}
	Set_Translucent(is_translucent);
	Set_Alpha(is_alpha);
	Set_Additive(is_additive);

	return WW3D_ERROR_OK;

}


/***********************************************************************************************
 * MeshClass::Cast_Ray -- compute a ray intersection with this mesh                            *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   6/17/98    GTH : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Cast_Ray(RayCollisionTestClass & raytest)
{
	if ((Get_Collision_Type() & raytest.CollisionType) == 0) return false;
	//Modified for 'Generals' so we could select trees but filter out headlight beams, etc. -MW
	if (raytest.CheckTranslucent && Is_Alpha()!=0)
		return false;
	if (Is_Hidden() && !raytest.CheckHidden) return false;

	Matrix3D world_to_obj;
	Matrix3D world=Get_Transform();

	// if aligned or oriented rotate the mesh so that it's aligned to the ray
	if (Model->Get_Flag(MeshModelClass::ALIGNED)) {
			Vector3 mesh_position;
			world.Get_Translation(&mesh_position);
			world.Obj_Look_At(mesh_position,mesh_position - raytest.Ray.Get_Dir(),0.0f);
	} else if (Model->Get_Flag(MeshModelClass::ORIENTED)) {		
			Vector3 mesh_position;
			world.Get_Translation(&mesh_position);
			world.Obj_Look_At(mesh_position,raytest.Ray.Get_P0(),0.0f);
	}

	world.Get_Inverse(world_to_obj);
	RayCollisionTestClass objray(raytest,world_to_obj);

	WWASSERT(Model);
	
	bool hit = Model->Cast_Ray(objray);
	
	// transform result back into original coordinate system
	if (hit) {
		raytest.CollidedRenderObj = this;
		Matrix3D::Rotate_Vector(world,raytest.Result->Normal, &(raytest.Result->Normal));
		if (raytest.Result->ComputeContactPoint) {
			Matrix3D::Transform_Vector(world,raytest.Result->ContactPoint, &(raytest.Result->ContactPoint));
		}
	}
	
	return hit;
}


/***********************************************************************************************
 * MeshClass::Cast_AABox -- cast an AABox against this mesh                                    *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   6/17/98    GTH : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Cast_AABox(AABoxCollisionTestClass & boxtest)
{
	if ((Get_Collision_Type() & boxtest.CollisionType) == 0) return false;

	WWASSERT(Model);

	// This function analyses the tranform to call optimized functions in certain cases
	bool hit = Model->Cast_World_Space_AABox(boxtest, Get_Transform());

	if (hit) {
		boxtest.CollidedRenderObj = this;
	}

	return hit;
}


/***********************************************************************************************
 * Cast_OBBox -- Cast an obbox against this mesh                                               *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   6/17/98    GTH : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Cast_OBBox(OBBoxCollisionTestClass & boxtest)
{
	if ((Get_Collision_Type() & boxtest.CollisionType) == 0) return false;

	/*
	** transform into the local coordinate system of the mesh.
	*/
	const Matrix3D & tm = Get_Transform();
	Matrix3D world_to_obj;
	tm.Get_Orthogonal_Inverse(world_to_obj);
	OBBoxCollisionTestClass localtest(boxtest,world_to_obj);

	WWASSERT(Model);

	bool hit = Model->Cast_OBBox(localtest);

	/*
	** If we hit, transform the result of the test back to the original coordinate system.
	*/
	if (hit) {
		boxtest.CollidedRenderObj = this;
		Matrix3D::Rotate_Vector(tm,boxtest.Result->Normal, &(boxtest.Result->Normal));
		if (boxtest.Result->ComputeContactPoint) {
			Matrix3D::Transform_Vector(tm,boxtest.Result->ContactPoint, &(boxtest.Result->ContactPoint));
		}
	}

	return hit;
}


/***********************************************************************************************
 * MeshClass::Intersect_AABox -- test for intersection with given AABox                        *
 *                                                                                             *
 * The AAbox given is assumed to be in world space.  Since meshes aren't generally in world    *
 * space, the test must be transformed into our local coordinate system (which turns it into   *
 * an OBBox...)                                                                                *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/19/00    gth : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Intersect_AABox(AABoxIntersectionTestClass & boxtest)
{
	if ((Get_Collision_Type() & boxtest.CollisionType) == 0) return false;

	Matrix3D inv_tm;
	Get_Transform().Get_Orthogonal_Inverse(inv_tm);
	OBBoxIntersectionTestClass local_test(boxtest,inv_tm);
	WWASSERT(Model);
	return Model->Intersect_OBBox(local_test);
}


/***********************************************************************************************
 * MeshClass::Intersect_OBBox -- test for intersection with the given OBBox                    *
 *                                                                                             *
 * The given OBBox is assumed to be in world space so we need to transform it into the mesh's  *
 * local coordinate system.                                                                    *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/19/00    gth : Created.                                                                 *
 *=============================================================================================*/
bool MeshClass::Intersect_OBBox(OBBoxIntersectionTestClass & boxtest)
{
	if ((Get_Collision_Type() & boxtest.CollisionType) == 0) return false;

	Matrix3D inv_tm;
	Get_Transform().Get_Orthogonal_Inverse(inv_tm);
	OBBoxIntersectionTestClass local_test(boxtest,inv_tm);
	WWASSERT(Model);
	return Model->Intersect_OBBox(local_test);
}


/***********************************************************************************************
 * MeshClass::Get_Obj_Space_Bounding_Sphere -- returns obj-space bounding sphere               *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/19/00    gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Get_Obj_Space_Bounding_Sphere(SphereClass & sphere) const
{
	if (Model) {
		Model->Get_Bounding_Sphere(&sphere);
	} else {
		sphere.Center.Set(0,0,0);
		sphere.Radius = 1.0f;
	}
}


/***********************************************************************************************
 * MeshClass::Get_Obj_Space_Bounding_Box -- returns the obj-space bounding box                 *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   1/19/00    gth : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Get_Obj_Space_Bounding_Box(AABoxClass & box) const
{
	if (Model) {
		Model->Get_Bounding_Box(&box);
	} else {
		box.Init(Vector3(0,0,0),Vector3(1,1,1));
	}
}


/***********************************************************************************************
 * MeshClass::Generate_Culling_Tree -- Generates a hierarchical culling tree for the mesh      *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   6/18/98    GTH : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Generate_Culling_Tree(void)
{
	Model->Generate_Culling_Tree();
}


/***********************************************************************************************
 * MeshClass::Add_Dependencies_To_List -- Add dependent files to the list.                     *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   3/18/99    PDS : Created.                                                                 *
 *=============================================================================================*/
void MeshClass::Add_Dependencies_To_List
(
	DynamicVectorClass<StringClass> &file_list,
	bool										textures_only
)
{
	//
	// Get a pointer to this mesh's material information object
	//
	MaterialInfoClass *material = Get_Material_Info ();
	if (material != NULL) {
		
		//
		// Loop through all the textures and add their filenames to our list
		//
		for (int index = 0; index < material->Texture_Count (); index ++) {
			
			//
			//	Add this texture's filename to the list
			//
			TextureClass *texture = material->Peek_Texture (index);
			if (texture != NULL) {
				file_list.Add (texture->Get_Full_Path ());
			}
		}
		
		//
		// Release our hold on the material information object
		//
		material->Release_Ref ();
	}

	RenderObjClass::Add_Dependencies_To_List (file_list, textures_only);
	return ;
}


/***********************************************************************************************
 * MeshClass::Update_Cached_Bounding_Volumes -- default collision sphere.                      *
 *                                                                                             *
 * INPUT:                                                                                      *
 *                                                                                             *
 * OUTPUT:                                                                                     *
 *                                                                                             *
 * WARNINGS:                                                                                   *
 *                                                                                             *
 * HISTORY:                                                                                    *
 *   5/14/2001    NH : Created.                                                                *
 *=============================================================================================*/
void MeshClass::Update_Cached_Bounding_Volumes(void) const
{
	Get_Obj_Space_Bounding_Sphere(CachedBoundingSphere);

#ifdef ALLOW_TEMPORARIES
	CachedBoundingSphere.Center = Get_Transform() * CachedBoundingSphere.Center;
#else
	Get_Transform().mulVector3(CachedBoundingSphere.Center);
#endif

	// If we are camera-aligned or -oriented, we don't know which way we are facing at this point,
	// so the box we return needs to contain the sphere. Otherewise do the normal computation.
	if (Model->Get_Flag(MeshModelClass::ALIGNED) || Model->Get_Flag(MeshModelClass::ORIENTED)) {
		CachedBoundingBox.Center = CachedBoundingSphere.Center;
		CachedBoundingBox.Extent.Set(CachedBoundingSphere.Radius, CachedBoundingSphere.Radius, CachedBoundingSphere.Radius);
	} else {
		Get_Obj_Space_Bounding_Box(CachedBoundingBox);
		CachedBoundingBox.Transform(Get_Transform());
	}

	Validate_Cached_Bounding_Volumes();
}


// This utility function recurses throughout the subobjects of a renderobject, and for each
// MeshClass it finds it sets the given MeshModel flag on its model. This is useful for stuff
// like making a RenderObjects' polys sort.
void Set_MeshModel_Flag(RenderObjClass *robj, int flag, int onoff)
{
	if (robj->Class_ID() == RenderObjClass::CLASSID_MESH) {
		// Set flag on model (the assumption is that meshes don't have subobjects)
		MeshClass *mesh = (MeshClass *)robj;
		MeshModelClass *model = mesh->Get_Model();
		model->Set_Flag((MeshModelClass::FlagsType)flag, onoff != 0);
		model->Release_Ref();
	} else {
		// Recurse to subobjects (if any)
		int num_obj = robj->Get_Num_Sub_Objects();
		RenderObjClass *sub_obj;
		for (int i = 0; i < num_obj; i++) {
			sub_obj = robj->Get_Sub_Object(i);
			if (sub_obj) {
				Set_MeshModel_Flag(sub_obj, flag, onoff);
				sub_obj->Release_Ref();
			}
		}
	}
}

int MeshClass::Get_Sort_Level(void) const
{ 
	if (Model) {
		return (Model->Get_Sort_Level());
	}
	return(SORT_LEVEL_NONE);
}	

void MeshClass::Set_Sort_Level(int level)
{ 
	if (Model) {
		Model->Set_Sort_Level(level);
	}
}

int MeshClass::Get_Draw_Call_Count(void) const
{
	if (Model != NULL) {
		// Prefer to return the number of polygon renderers
		int prcount = Model->PolygonRendererList.Count();
		if (prcount > 0) {
			return prcount;
		}
		
		// Otherwise if we have textures, return the number of textures (e.g. dont have prs when sorting)
		if ((Model->MatInfo != NULL) && (Model->MatInfo->Texture_Count() > 0)) {
			return Model->MatInfo->Texture_Count();
		}

		// Otherwise, return 1
		return 1;

	} else {
		return 0;
	}
}