assimp.assimp/include/aiPostProcess.h

/*
Open Asset Import Library (ASSIMP)
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*/

/** @file Definitions for import post processing steps */
#ifndef AI_POSTPROCESS_H_INC
#define AI_POSTPROCESS_H_INC

#include "aiTypes.h"

#ifdef __cplusplus
extern "C" {
#endif

/** Defines the flags for all possible post processing steps. */
enum aiPostProcessSteps
{
	/** Calculates the tangents and bitangents for the imported meshes. Does nothing
	 * if a mesh does not have normals. You might want this post processing step to be
	 * executed if you plan to use tangent space calculations such as normal mapping 
	 * applied to the meshes.
	 */
	aiProcess_CalcTangentSpace = 1,

	/** Identifies and joins identical vertex data sets within all imported meshes. 
	 * After this step is run each mesh does contain only unique vertices anymore,
	 * so a vertex is possibly used by multiple faces. You propably always want
	 * to use this post processing step.*/
	aiProcess_JoinIdenticalVertices = 2,

	/** Converts all the imported data to a left-handed coordinate space such as 
	 * the DirectX coordinate system. By default the data is returned in a right-handed
	 * coordinate space which for example OpenGL prefers. In this space, +X points to the
	 * right, +Y points towards the viewer and and +Z points upwards. In the DirectX 
     * coordinate space +X points to the right, +Y points upwards and +Z points 
     * away from the viewer.
	 */
	aiProcess_ConvertToLeftHanded = 4,

	/** Triangulates all faces of all meshes. By default the imported mesh data might 
	 * contain faces with more than 3 indices. For rendering a mesh you usually need
	 * all faces to be triangles. This post processing step splits up all higher faces
	 * to triangles.
	 */
	aiProcess_Triangulate = 8,

	/** Omits all normals found in the file. This can be used together
	 * with either the aiProcess_GenNormals or the aiProcess_GenSmoothNormals
	 * flag to force the recomputation of the normals.
	 */
	aiProcess_KillNormals = 0x10,

	/** Generates normals for all faces of all meshes. The normals are shared
	* between the three vertices of a face. This is ignored
	* if normals are already existing. This flag may not be specified together
	* with aiProcess_GenSmoothNormals
	*/
	aiProcess_GenNormals = 0x20,

	/** Generates smooth normals for all vertices in the mesh. This is ignored
	* if normals are already existing. This flag may not be specified together
	* with aiProcess_GenNormals
	*/
	aiProcess_GenSmoothNormals = 0x40,

	/** Splits large meshes into submeshes
	* This is quite useful for realtime rendering where the number of vertices
	* is usually limited by the video driver.
	*
	* The split limits can be set through aiSetVertexSplitLimit() and
	* aiSetTriangleSplitLimit(). The default values for this are defined
	* in the internal SplitLargeMeshes.h header as AI_SLM_DEFAULT_MAX_VERTICES
	* and AI_SLM_DEFAULT_MAX_TRIANGLES. 
	*/
	aiProcess_SplitLargeMeshes = 0x80,

	/** Removes the node graph and pretransforms all vertices with
	* the local transformation matrices of their nodes. The output
	* scene does still contain nodes, however, there is only a
	* root node with childs, each one referencing only one mesh,
	* each mesh referencing one material. For rendering, you can
	* simply render all meshes in order, you don't need to pay
	* attention to local transformations and the node hierarchy.
	* Animations are removed during this step. 
	* This step is intended for applications that have no scenegraph.
	* The step CAN cause some problems: if e.g. a mesh of the asset
	* contains normals and another, using the same material index, does not, 
	* they will be brought together, but the first meshes's part of
	* the normal list will be zeroed.
	*/
	aiProcess_PreTransformVertices = 0x100,
};

// ---------------------------------------------------------------------------
/** \brief Set the maximum number of vertices in a mesh.
 *
 * This is used by the SplitLargeMeshes PostProcess-Step to determine
 * whether a mesh must be splitted or not.
 * \param pLimit Vertex limit. 
 * \note The default value is AI_SLM_DEFAULT_MAX_VERTICES, defined in
 *       the internal header file SplitLargeMeshes.h
 */
aiReturn aiSetVertexSplitLimit(unsigned int pLimit);


// ---------------------------------------------------------------------------
/** \brief Set the maximum number of triangles in a mesh.
 *
 * This is used by the SplitLargeMeshes PostProcess-Step to determine
 * whether a mesh must be splitted or not.
 * \param pLimit Triangle limit
 * \note The default value is AI_SLM_DEFAULT_MAX_TRIANGLES, defined in
 *       the internal header file SplitLargeMeshes.h
 */
aiReturn aiSetTriangleSplitLimit(unsigned int pLimit);

#ifdef __cplusplus
} // end of extern "C"
#endif

#endif // AI_POSTPROCESS_H_INC