assimp.assimp/code/ACLoader.cpp

/*
---------------------------------------------------------------------------
Open Asset Import Library (assimp)
---------------------------------------------------------------------------

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All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
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  derived from this software without specific prior
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*/

/** @file Implementation of the AC3D importer class */



#ifndef ASSIMP_BUILD_NO_AC_IMPORTER

// internal headers
#include "ACLoader.h"
#include "ParsingUtils.h"
#include "fast_atof.h"
#include "Subdivision.h"
#include "Importer.h"
#include "BaseImporter.h"
#include "../include/assimp/Importer.hpp"
#include "../include/assimp/light.h"
#include "../include/assimp/DefaultLogger.hpp"
#include "../include/assimp/material.h"
#include "../include/assimp/scene.h"
#include "../include/assimp/config.h"
#include "../include/assimp/IOSystem.hpp"
#include <boost/scoped_ptr.hpp>

using namespace Assimp;

static const aiImporterDesc desc = {
	"AC3D Importer",
	"",
	"",
	"",
	aiImporterFlags_SupportTextFlavour,
	0,
	0,
	0,
	0,
	"ac acc ac3d"
};

// ------------------------------------------------------------------------------------------------
// skip to the next token
#define AI_AC_SKIP_TO_NEXT_TOKEN() \
	if (!SkipSpaces(&buffer)) \
	{ \
		DefaultLogger::get()->error("AC3D: Unexpected EOF/EOL"); \
		continue; \
	} 

// ------------------------------------------------------------------------------------------------
// read a string (may be enclosed in double quotation marks). buffer must point to "
#define AI_AC_GET_STRING(out) \
	++buffer; \
	const char* sz = buffer; \
	while ('\"' != *buffer) \
	{ \
		if (IsLineEnd( *buffer )) \
		{ \
			DefaultLogger::get()->error("AC3D: Unexpected EOF/EOL in string"); \
			out = "ERROR"; \
			break; \
		} \
		++buffer; \
	} \
	if (IsLineEnd( *buffer ))continue; \
	out = std::string(sz,(unsigned int)(buffer-sz)); \
	++buffer;


// ------------------------------------------------------------------------------------------------
// read 1 to n floats prefixed with an optional predefined identifier 
#define AI_AC_CHECKED_LOAD_FLOAT_ARRAY(name,name_length,num,out) \
	AI_AC_SKIP_TO_NEXT_TOKEN(); \
	if (name_length) \
	{ \
		if (strncmp(buffer,name,name_length) || !IsSpace(buffer[name_length])) \
		{ \
			DefaultLogger::get()->error("AC3D: Unexpexted token. " name " was expected."); \
			continue; \
		} \
		buffer += name_length+1; \
	} \
	for (unsigned int i = 0; i < num;++i) \
	{ \
		AI_AC_SKIP_TO_NEXT_TOKEN(); \
		buffer = fast_atoreal_move<float>(buffer,((float*)out)[i]); \
	}


// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
AC3DImporter::AC3DImporter()
{
	// nothing to be done here
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well 
AC3DImporter::~AC3DImporter()
{
	// nothing to be done here
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file. 
bool AC3DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const
{
	std::string extension = GetExtension(pFile);

	// fixme: are acc and ac3d *really* used? Some sources say they are
	if(extension == "ac" || extension == "ac3d" || extension == "acc") {
		return true;
	}
	if (!extension.length() || checkSig) {
		uint32_t token = AI_MAKE_MAGIC("AC3D");
		return CheckMagicToken(pIOHandler,pFile,&token,1,0);
	}
	return false;
}

// ------------------------------------------------------------------------------------------------
// Loader meta information
const aiImporterDesc* AC3DImporter::GetInfo () const
{
	return &desc;
}

// ------------------------------------------------------------------------------------------------
// Get a pointer to the next line from the file
bool AC3DImporter::GetNextLine( )
{
	SkipLine(&buffer); 
	return SkipSpaces(&buffer);
}

// ------------------------------------------------------------------------------------------------
// Parse an object section in an AC file
void AC3DImporter::LoadObjectSection(std::vector<Object>& objects)
{
	if (!TokenMatch(buffer,"OBJECT",6))
		return;

	SkipSpaces(&buffer);

	++mNumMeshes;

	objects.push_back(Object());
	Object& obj = objects.back();

	aiLight* light = NULL;
	if (!ASSIMP_strincmp(buffer,"light",5))
	{
		// This is a light source. Add it to the list
		mLights->push_back(light = new aiLight());

		// Return a point light with no attenuation
		light->mType = aiLightSource_POINT;
		light->mColorDiffuse = light->mColorSpecular = aiColor3D(1.f,1.f,1.f);
		light->mAttenuationConstant = 1.f;

		// Generate a default name for both the light source and the node
		// FIXME - what's the right way to print a size_t? Is 'zu' universally available? stick with the safe version.
		light->mName.length = ::sprintf(light->mName.data,"ACLight_%i",static_cast<unsigned int>(mLights->size())-1);
		obj.name = std::string( light->mName.data );

		DefaultLogger::get()->debug("AC3D: Light source encountered");
		obj.type = Object::Light;
	}
	else if (!ASSIMP_strincmp(buffer,"group",5))
	{
		obj.type = Object::Group;
	}
	else if (!ASSIMP_strincmp(buffer,"world",5))
	{
		obj.type = Object::World;
	}
	else obj.type = Object::Poly;
	while (GetNextLine())
	{
		if (TokenMatch(buffer,"kids",4))
		{
			SkipSpaces(&buffer);
			unsigned int num = strtoul10(buffer,&buffer);
			GetNextLine();
			if (num)
			{
				// load the children of this object recursively
				obj.children.reserve(num);
				for (unsigned int i = 0; i < num; ++i)
					LoadObjectSection(obj.children);
			}
			return;
		}
		else if (TokenMatch(buffer,"name",4))
		{
			SkipSpaces(&buffer);
			AI_AC_GET_STRING(obj.name);

			// If this is a light source, we'll also need to store
			// the name of the node in it.
			if (light)
			{
				light->mName.Set(obj.name);
			}
		}
		else if (TokenMatch(buffer,"texture",7))
		{
			SkipSpaces(&buffer);
			AI_AC_GET_STRING(obj.texture);
		}
		else if (TokenMatch(buffer,"texrep",6))
		{
			SkipSpaces(&buffer);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&obj.texRepeat);
			if (!obj.texRepeat.x || !obj.texRepeat.y)
				obj.texRepeat = aiVector2D (1.f,1.f);
		}
		else if (TokenMatch(buffer,"texoff",6))
		{
			SkipSpaces(&buffer);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&obj.texOffset);
		}
		else if (TokenMatch(buffer,"rot",3))
		{
			SkipSpaces(&buffer);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,9,&obj.rotation);
		}
		else if (TokenMatch(buffer,"loc",3))
		{
			SkipSpaces(&buffer);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,3,&obj.translation);
		}
		else if (TokenMatch(buffer,"subdiv",6))
		{
			SkipSpaces(&buffer);
			obj.subDiv = strtoul10(buffer,&buffer);
		}
		else if (TokenMatch(buffer,"crease",6))
		{
			SkipSpaces(&buffer);
			obj.crease = fast_atof(buffer);
		}
		else if (TokenMatch(buffer,"numvert",7))
		{
			SkipSpaces(&buffer);

			unsigned int t = strtoul10(buffer,&buffer);
			if (t >= std::numeric_limits<int32_t>::max() / sizeof(aiVector3D)) {
				throw DeadlyImportError("AC3D: Too many vertices, would run out of memory");
			}
			obj.vertices.reserve(t);
			for (unsigned int i = 0; i < t;++i)
			{
				if (!GetNextLine())
				{
					DefaultLogger::get()->error("AC3D: Unexpected EOF: not all vertices have been parsed yet");
					break;
				}
				else if (!IsNumeric(*buffer))
				{
					DefaultLogger::get()->error("AC3D: Unexpected token: not all vertices have been parsed yet");
					--buffer; // make sure the line is processed a second time
					break;
				}
				obj.vertices.push_back(aiVector3D());
				aiVector3D& v = obj.vertices.back();
				AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,3,&v.x);
			}
		}
		else if (TokenMatch(buffer,"numsurf",7))
		{
			SkipSpaces(&buffer);
			
			bool Q3DWorkAround = false;

			const unsigned int t = strtoul10(buffer,&buffer);
			obj.surfaces.reserve(t);
			for (unsigned int i = 0; i < t;++i)
			{
				GetNextLine();
				if (!TokenMatch(buffer,"SURF",4))
				{
					// FIX: this can occur for some files - Quick 3D for 
					// example writes no surf chunks
					if (!Q3DWorkAround)
					{
						DefaultLogger::get()->warn("AC3D: SURF token was expected");
						DefaultLogger::get()->debug("Continuing with Quick3D Workaround enabled");
					}
					--buffer; // make sure the line is processed a second time
					// break; --- see fix notes above

					Q3DWorkAround = true;
				}
				SkipSpaces(&buffer);
				obj.surfaces.push_back(Surface());
				Surface& surf = obj.surfaces.back();
				surf.flags = strtoul_cppstyle(buffer);
			
				while (1)
				{
					if(!GetNextLine())
					{
						DefaultLogger::get()->error("AC3D: Unexpected EOF: surface is incomplete");
						break;
					}
					if (TokenMatch(buffer,"mat",3))
					{
						SkipSpaces(&buffer);
						surf.mat = strtoul10(buffer);
					}
					else if (TokenMatch(buffer,"refs",4))
					{
						// --- see fix notes above
						if (Q3DWorkAround)
						{
							if (!surf.entries.empty())
							{
								buffer -= 6;
								break;
							}
						}

						SkipSpaces(&buffer);
						const unsigned int m = strtoul10(buffer);
						surf.entries.reserve(m);

						obj.numRefs += m;

						for (unsigned int k = 0; k < m; ++k)
						{
							if(!GetNextLine())
							{
								DefaultLogger::get()->error("AC3D: Unexpected EOF: surface references are incomplete");
								break;
							}
							surf.entries.push_back(Surface::SurfaceEntry());
							Surface::SurfaceEntry& entry = surf.entries.back();

							entry.first = strtoul10(buffer,&buffer);
							SkipSpaces(&buffer);
							AI_AC_CHECKED_LOAD_FLOAT_ARRAY("",0,2,&entry.second);
						}
					}
					else 
					{

						--buffer; // make sure the line is processed a second time
						break;
					}
				}
			}
		}
	}
	DefaultLogger::get()->error("AC3D: Unexpected EOF: \'kids\' line was expected");
}

// ------------------------------------------------------------------------------------------------
// Convert a material from AC3DImporter::Material to aiMaterial
void AC3DImporter::ConvertMaterial(const Object& object,
	const Material& matSrc,
	aiMaterial& matDest)
{
	aiString s;

	if (matSrc.name.length())
	{
		s.Set(matSrc.name);
		matDest.AddProperty(&s,AI_MATKEY_NAME);
	}
	if (object.texture.length())
	{
		s.Set(object.texture);
		matDest.AddProperty(&s,AI_MATKEY_TEXTURE_DIFFUSE(0));

		// UV transformation
		if (1.f != object.texRepeat.x || 1.f != object.texRepeat.y ||
			object.texOffset.x        || object.texOffset.y)
		{
			aiUVTransform transform;
			transform.mScaling = object.texRepeat;
			transform.mTranslation = object.texOffset;
			matDest.AddProperty(&transform,1,AI_MATKEY_UVTRANSFORM_DIFFUSE(0));
		}
	}

	matDest.AddProperty<aiColor3D>(&matSrc.rgb,1, AI_MATKEY_COLOR_DIFFUSE);
	matDest.AddProperty<aiColor3D>(&matSrc.amb,1, AI_MATKEY_COLOR_AMBIENT);
	matDest.AddProperty<aiColor3D>(&matSrc.emis,1,AI_MATKEY_COLOR_EMISSIVE);
	matDest.AddProperty<aiColor3D>(&matSrc.spec,1,AI_MATKEY_COLOR_SPECULAR);

	int n;
	if (matSrc.shin)
	{
		n = aiShadingMode_Phong;
		matDest.AddProperty<float>(&matSrc.shin,1,AI_MATKEY_SHININESS);
	}
	else n = aiShadingMode_Gouraud;
	matDest.AddProperty<int>(&n,1,AI_MATKEY_SHADING_MODEL);

	float f = 1.f - matSrc.trans;
	matDest.AddProperty<float>(&f,1,AI_MATKEY_OPACITY);
}

// ------------------------------------------------------------------------------------------------
// Converts the loaded data to the internal verbose representation
aiNode* AC3DImporter::ConvertObjectSection(Object& object,
	std::vector<aiMesh*>& meshes,
	std::vector<aiMaterial*>& outMaterials,
	const std::vector<Material>& materials,
	aiNode* parent)
{
	aiNode* node = new aiNode();
	node->mParent = parent;
	if (object.vertices.size())
	{
		if (!object.surfaces.size() || !object.numRefs)
		{
			/* " An object with 7 vertices (no surfaces, no materials defined). 
			     This is a good way of getting point data into AC3D. 
			     The Vertex->create convex-surface/object can be used on these
			     vertices to 'wrap' a 3d shape around them "
				 (http://www.opencity.info/html/ac3dfileformat.html)

				 therefore: if no surfaces are defined return point data only
			 */

			DefaultLogger::get()->info("AC3D: No surfaces defined in object definition, "
				"a point list is returned");

			meshes.push_back(new aiMesh());
			aiMesh* mesh = meshes.back();

			mesh->mNumFaces = mesh->mNumVertices = (unsigned int)object.vertices.size();
			aiFace* faces = mesh->mFaces = new aiFace[mesh->mNumFaces];
			aiVector3D* verts = mesh->mVertices = new aiVector3D[mesh->mNumVertices];

			for (unsigned int i = 0; i < mesh->mNumVertices;++i,++faces,++verts)
			{
				*verts = object.vertices[i];
				faces->mNumIndices = 1;
				faces->mIndices = new unsigned int[1];
				faces->mIndices[0] = i;
			}

			// use the primary material in this case. this should be the
			// default material if all objects of the file contain points
			// and no faces.
			mesh->mMaterialIndex = 0;
			outMaterials.push_back(new aiMaterial());
			ConvertMaterial(object, materials[0], *outMaterials.back());
		}
		else
		{
			// need to generate one or more meshes for this object.
			// find out how many different materials we have
			typedef std::pair< unsigned int, unsigned int > IntPair;
			typedef std::vector< IntPair > MatTable;
			MatTable needMat(materials.size(),IntPair(0,0));

			std::vector<Surface>::iterator it,end = object.surfaces.end();
			std::vector<Surface::SurfaceEntry>::iterator it2,end2;

			for (it = object.surfaces.begin(); it != end; ++it)
			{
				unsigned int idx = (*it).mat;
				if (idx >= needMat.size())
				{
					DefaultLogger::get()->error("AC3D: material index is out of range");
					idx = 0;
				}
				if ((*it).entries.empty())
				{
					DefaultLogger::get()->warn("AC3D: surface her zero vertex references");
				}

				// validate all vertex indices to make sure we won't crash here
				for (it2  = (*it).entries.begin(),
					 end2 = (*it).entries.end(); it2 != end2; ++it2)
				{
					if ((*it2).first >= object.vertices.size())
					{
						DefaultLogger::get()->warn("AC3D: Invalid vertex reference");
						(*it2).first = 0;
					}
				}

				if (!needMat[idx].first)++node->mNumMeshes;

				switch ((*it).flags & 0xf)
				{
					// closed line
				case 0x1:

					needMat[idx].first  += (unsigned int)(*it).entries.size();
					needMat[idx].second += (unsigned int)(*it).entries.size()<<1u;
					break;

					// unclosed line
				case 0x2:

					needMat[idx].first  += (unsigned int)(*it).entries.size()-1;
					needMat[idx].second += ((unsigned int)(*it).entries.size()-1)<<1u;
					break;

					// 0 == polygon, else unknown
				default:

					if ((*it).flags & 0xf)
					{
						DefaultLogger::get()->warn("AC3D: The type flag of a surface is unknown");
						(*it).flags &= ~(0xf);
					}

					// the number of faces increments by one, the number
					// of vertices by surface.numref.
					needMat[idx].first++;
					needMat[idx].second += (unsigned int)(*it).entries.size();
				};
			}
			unsigned int* pip = node->mMeshes = new unsigned int[node->mNumMeshes];
			unsigned int mat = 0;
			const size_t oldm = meshes.size();
			for (MatTable::const_iterator cit = needMat.begin(), cend = needMat.end();
				cit != cend; ++cit, ++mat)
			{
				if (!(*cit).first)continue;

				// allocate a new aiMesh object
				*pip++ = (unsigned int)meshes.size();
				aiMesh* mesh = new aiMesh();
				meshes.push_back(mesh);

				mesh->mMaterialIndex = (unsigned int)outMaterials.size();
				outMaterials.push_back(new aiMaterial());
				ConvertMaterial(object, materials[mat], *outMaterials.back());

				// allocate storage for vertices and normals
				mesh->mNumFaces = (*cit).first;
				aiFace* faces = mesh->mFaces = new aiFace[mesh->mNumFaces];

				mesh->mNumVertices = (*cit).second;
				aiVector3D* vertices = mesh->mVertices = new aiVector3D[mesh->mNumVertices];
				unsigned int cur = 0;

				// allocate UV coordinates, but only if the texture name for the
				// surface is not empty
				aiVector3D* uv = NULL;
				if(object.texture.length())
				{
					uv = mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];
					mesh->mNumUVComponents[0] = 2;
				}

				for (it = object.surfaces.begin(); it != end; ++it)
				{
					if (mat == (*it).mat)
					{
						const Surface& src = *it;

						// closed polygon
						unsigned int type = (*it).flags & 0xf; 
						if (!type)
						{
							aiFace& face = *faces++;
							if((face.mNumIndices = (unsigned int)src.entries.size()))
							{
								face.mIndices = new unsigned int[face.mNumIndices];
								for (unsigned int i = 0; i < face.mNumIndices;++i,++vertices)
								{
									const Surface::SurfaceEntry& entry = src.entries[i];
									face.mIndices[i] = cur++;

									// copy vertex positions
									if ((vertices - mesh->mVertices) >= mesh->mNumVertices) {
										throw DeadlyImportError("AC3D: Invalid number of vertices");
									}
									*vertices = object.vertices[entry.first] + object.translation;


									// copy texture coordinates 
									if (uv)
									{
										uv->x =  entry.second.x;
										uv->y =  entry.second.y;
										++uv;
									}
								}
							}
						}
						else
						{
							
							it2  = (*it).entries.begin();

							// either a closed or an unclosed line
							unsigned int tmp = (unsigned int)(*it).entries.size();
							if (0x2 == type)--tmp;
							for (unsigned int m = 0; m < tmp;++m)
							{
								aiFace& face = *faces++;

								face.mNumIndices = 2;
								face.mIndices = new unsigned int[2];
								face.mIndices[0] = cur++;
								face.mIndices[1] = cur++;

								// copy vertex positions
								if (it2 == (*it).entries.end() ) {
									throw DeadlyImportError("AC3D: Bad line");
								}
								ai_assert((*it2).first < object.vertices.size());
								*vertices++ = object.vertices[(*it2).first];
								
								// copy texture coordinates 
								if (uv)
								{
									uv->x =  (*it2).second.x;
									uv->y =  (*it2).second.y;
									++uv;
								}


								if (0x1 == type && tmp-1 == m)
								{
									// if this is a closed line repeat its beginning now
									it2  = (*it).entries.begin();
								}
								else ++it2;

								// second point
								*vertices++ = object.vertices[(*it2).first];

								if (uv)
								{
									uv->x =  (*it2).second.x;
									uv->y =  (*it2).second.y;
									++uv;
								}
							}
						}
					}
				}
			}

			// Now apply catmull clark subdivision if necessary. We split meshes into
			// materials which is not done by AC3D during smoothing, so we need to
			// collect all meshes using the same material group.
			if (object.subDiv)	{
				if (configEvalSubdivision) {
					boost::scoped_ptr<Subdivider> div(Subdivider::Create(Subdivider::CATMULL_CLARKE));
					DefaultLogger::get()->info("AC3D: Evaluating subdivision surface: "+object.name);

					std::vector<aiMesh*> cpy(meshes.size()-oldm,NULL);
					div->Subdivide(&meshes[oldm],cpy.size(),&cpy.front(),object.subDiv,true);
					std::copy(cpy.begin(),cpy.end(),meshes.begin()+oldm);

					// previous meshes are deleted vy Subdivide().
				}
				else {
					DefaultLogger::get()->info("AC3D: Letting the subdivision surface untouched due to my configuration: "
						+object.name);
				}
			}
		}
	}

	if (object.name.length())
		node->mName.Set(object.name);
	else
	{
		// generate a name depending on the type of the node
		switch (object.type)
		{
		case Object::Group:
			node->mName.length = ::sprintf(node->mName.data,"ACGroup_%i",groups++);
			break;
		case Object::Poly:
			node->mName.length = ::sprintf(node->mName.data,"ACPoly_%i",polys++);
			break;
		case Object::Light:
			node->mName.length = ::sprintf(node->mName.data,"ACLight_%i",lights++);
			break;

			// there shouldn't be more than one world, but we don't care
		case Object::World: 
			node->mName.length = ::sprintf(node->mName.data,"ACWorld_%i",worlds++);
			break;
		}
	}


	// setup the local transformation matrix of the object
	// compute the transformation offset to the parent node
	node->mTransformation = aiMatrix4x4 ( object.rotation );

	if (object.type == Object::Group || !object.numRefs)
	{
		node->mTransformation.a4 = object.translation.x;
		node->mTransformation.b4 = object.translation.y;
		node->mTransformation.c4 = object.translation.z;
	}

	// add children to the object
	if (object.children.size())
	{
		node->mNumChildren = (unsigned int)object.children.size();
		node->mChildren = new aiNode*[node->mNumChildren];
		for (unsigned int i = 0; i < node->mNumChildren;++i)
		{
			node->mChildren[i] = ConvertObjectSection(object.children[i],meshes,outMaterials,materials,node);
		}
	}

	return node;
}

// ------------------------------------------------------------------------------------------------
void AC3DImporter::SetupProperties(const Importer* pImp)
{
	configSplitBFCull = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_AC_SEPARATE_BFCULL,1) ? true : false;
	configEvalSubdivision =  pImp->GetPropertyInteger(AI_CONFIG_IMPORT_AC_EVAL_SUBDIVISION,1) ? true : false;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure. 
void AC3DImporter::InternReadFile( const std::string& pFile, 
	aiScene* pScene, IOSystem* pIOHandler)
{
	boost::scoped_ptr<IOStream> file( pIOHandler->Open( pFile, "rb"));

	// Check whether we can read from the file
	if( file.get() == NULL)
		throw DeadlyImportError( "Failed to open AC3D file " + pFile + ".");

	// allocate storage and copy the contents of the file to a memory buffer
	std::vector<char> mBuffer2;
	TextFileToBuffer(file.get(),mBuffer2);

	buffer = &mBuffer2[0];
	mNumMeshes = 0;

	lights = polys = worlds = groups = 0;

	if (::strncmp(buffer,"AC3D",4)) {
		throw DeadlyImportError("AC3D: No valid AC3D file, magic sequence not found");
	}

	// print the file format version to the console
	unsigned int version = HexDigitToDecimal( buffer[4] );
	char msg[3];
	ASSIMP_itoa10(msg,3,version);
	DefaultLogger::get()->info(std::string("AC3D file format version: ") + msg);

	std::vector<Material> materials;
	materials.reserve(5);

	std::vector<Object> rootObjects;
	rootObjects.reserve(5);

	std::vector<aiLight*> lights;
	mLights = & lights;

	while (GetNextLine())
	{
		if (TokenMatch(buffer,"MATERIAL",8))
		{
			materials.push_back(Material());
			Material& mat = materials.back();

			// manually parse the material ... sscanf would use the buldin atof ...
			// Format: (name) rgb %f %f %f  amb %f %f %f  emis %f %f %f  spec %f %f %f  shi %d  trans %f

			AI_AC_SKIP_TO_NEXT_TOKEN();
			if ('\"' == *buffer)
			{
				AI_AC_GET_STRING(mat.name);
				AI_AC_SKIP_TO_NEXT_TOKEN();
			}

			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("rgb",3,3,&mat.rgb);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("amb",3,3,&mat.amb);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("emis",4,3,&mat.emis);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("spec",4,3,&mat.spec);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("shi",3,1,&mat.shin);
			AI_AC_CHECKED_LOAD_FLOAT_ARRAY("trans",5,1,&mat.trans);
		}
		LoadObjectSection(rootObjects);
	}

	if (rootObjects.empty() || !mNumMeshes)
	{
		throw DeadlyImportError("AC3D: No meshes have been loaded");
	}
	if (materials.empty())
	{
		DefaultLogger::get()->warn("AC3D: No material has been found");
		materials.push_back(Material());
	}

	mNumMeshes += (mNumMeshes>>2u) + 1;
	std::vector<aiMesh*> meshes;
	meshes.reserve(mNumMeshes);

	std::vector<aiMaterial*> omaterials;
	materials.reserve(mNumMeshes);

	// generate a dummy root if there are multiple objects on the top layer
	Object* root;
	if (1 == rootObjects.size())
		root = &rootObjects[0];
	else
	{
		root = new Object();
	}

	// now convert the imported stuff to our output data structure
	pScene->mRootNode = ConvertObjectSection(*root,meshes,omaterials,materials);
	if (1 != rootObjects.size())delete root;

	if (!::strncmp( pScene->mRootNode->mName.data, "Node", 4))
		pScene->mRootNode->mName.Set("<AC3DWorld>");

	// copy meshes
	if (meshes.empty())
	{
		throw DeadlyImportError("An unknown error occured during converting");
	}
	pScene->mNumMeshes = (unsigned int)meshes.size();
	pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
	::memcpy(pScene->mMeshes,&meshes[0],pScene->mNumMeshes*sizeof(void*));

	// copy materials
	pScene->mNumMaterials = (unsigned int)omaterials.size();
	pScene->mMaterials = new aiMaterial*[pScene->mNumMaterials];
	::memcpy(pScene->mMaterials,&omaterials[0],pScene->mNumMaterials*sizeof(void*));

	// copy lights
	pScene->mNumLights = (unsigned int)lights.size();
	if (lights.size())
	{
		pScene->mLights = new aiLight*[lights.size()];
		::memcpy(pScene->mLights,&lights[0],lights.size()*sizeof(void*));
	}
}

#endif //!defined ASSIMP_BUILD_NO_AC_IMPORTER