assimp/code/SmoothingGroups.h

/*
Open Asset Import Library (assimp)
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*/

/** @file Defines the helper data structures for importing 3DS files.
http://www.jalix.org/ressources/graphics/3DS/_unofficials/3ds-unofficial.txt */

#ifndef AI_SMOOTHINGGROUPS_H_INC
#define AI_SMOOTHINGGROUPS_H_INC

// ---------------------------------------------------------------------------
/** Helper structure representing a face with smoothing groups assigned */
struct FaceWithSmoothingGroup
{
	FaceWithSmoothingGroup() : iSmoothGroup(0)
	{
		// let the rest uninitialized for performance - in release builds.
		// in debug builds set all indices to a common magic value
#ifdef _DEBUG
		this->mIndices[0] = 0xffffffff;
		this->mIndices[1] = 0xffffffff;
		this->mIndices[2] = 0xffffffff;
#endif
	}

	
	//! Indices. .3ds is using uint16. However, after
	//! an unique vrtex set has been generated,
	//! individual index values might exceed 2^16
	uint32_t mIndices[3];

	//! specifies to which smoothing group the face belongs to
	uint32_t iSmoothGroup;
};

// ---------------------------------------------------------------------------
/** Helper structure representing a mesh whose faces have smoothing
    groups assigned. This allows us to reuse the code for normal computations 
	from smoothings groups for several loaders (3DS, ASE). All of them 
	use face structures which inherit from #FaceWithSmoothingGroup,
	but as they add extra members and need to be copied by value we
	need to use a template here.
	*/
template <class T>
struct MeshWithSmoothingGroups
{
	//! Vertex positions
	std::vector<aiVector3D> mPositions;

	//! Face lists
	std::vector<T> mFaces;

	//! List of normal vectors
	std::vector<aiVector3D> mNormals;
};

// ---------------------------------------------------------------------------
/** Computes normal vectors for the mesh
 */
template <class T>
void ComputeNormalsWithSmoothingsGroups(MeshWithSmoothingGroups<T>& sMesh);


// include implementations
#include "SmoothingGroups.inl"

#endif // !! AI_SMOOTHINGGROUPS_H_INC