assimp/tools/assimp_view/Normals.cpp

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

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  following disclaimer.

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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/


#include "stdafx.h"
#include "assimp_view.h"

#include "GenFaceNormalsProcess.h"
#include "GenVertexNormalsProcess.h"
#include "JoinVerticesProcess.h"
#include "CalcTangentsProcess.h"
#include "extra/MakeVerboseFormat.h"

namespace AssimpView {


// NOTE: These classes are necessary since the c'tors of all
// postprocess steps are protected. Generally they're not 
// intended to be used directly by applications.
//
// However, the viewer is an exception. It does nothing than
// displaxing the aiScene, so it wouldn't make sense to copy
// the data to another data structure.
//
class MyGenFaceNormalsProcess : public Assimp::GenFaceNormalsProcess
{
public:
	MyGenFaceNormalsProcess() {}
};

class MyGenVertexNormalsProcess : public Assimp::GenVertexNormalsProcess
{
public:
	MyGenVertexNormalsProcess() {}
};

class MyMakeVerboseFormatProcess : public Assimp::MakeVerboseFormatProcess
{
public:
	MyMakeVerboseFormatProcess() {}
};

class MyCalcTangentsProcess : public Assimp::CalcTangentsProcess
{
public:
	MyCalcTangentsProcess() {}
};

class MyJoinVerticesProcess : public Assimp::JoinVerticesProcess
{
public:
	MyJoinVerticesProcess() {}
};


bool g_bWasFlipped = false;

//-------------------------------------------------------------------------------
// Flip all normal vectors
//-------------------------------------------------------------------------------
void AssetHelper::FlipNormals()
{
	// invert all normal vectors
	for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
	{
		aiMesh* pcMesh = this->pcScene->mMeshes[i];
		for (unsigned int a = 0; a < pcMesh->mNumVertices;++a)
		{
			pcMesh->mNormals[a] *= -1.0f;
		}
	}
	// recreate native data
	DeleteAssetData(true);
	CreateAssetData();
	g_bWasFlipped = ! g_bWasFlipped;
}

//-------------------------------------------------------------------------------
// Set the normal set of the scene
//-------------------------------------------------------------------------------
void AssetHelper::SetNormalSet(unsigned int iSet)
{
	if (this->iNormalSet == iSet)return;

	// we need to build an unique set of vertices for this ...
	{
		MyMakeVerboseFormatProcess* pcProcess = new MyMakeVerboseFormatProcess();
		pcProcess->Execute(this->pcScene);
		delete pcProcess;

		for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
		{
			if (!this->apcMeshes[i]->pvOriginalNormals)
			{
				this->apcMeshes[i]->pvOriginalNormals = new aiVector3D[this->pcScene->mMeshes[i]->mNumVertices];
				memcpy( this->apcMeshes[i]->pvOriginalNormals,this->pcScene->mMeshes[i]->mNormals,
					this->pcScene->mMeshes[i]->mNumVertices * sizeof(aiVector3D));
			}
			delete[] this->pcScene->mMeshes[i]->mNormals;
			this->pcScene->mMeshes[i]->mNormals = NULL;
		}
	}


	// now we can start to calculate a new set of normals
	if (HARD == iSet)
	{
		MyGenFaceNormalsProcess* pcProcess = new MyGenFaceNormalsProcess();
		pcProcess->Execute(this->pcScene);
		delete pcProcess;
	}
	else if (SMOOTH == iSet)
	{
		MyGenVertexNormalsProcess* pcProcess = new MyGenVertexNormalsProcess();
		pcProcess->Execute(this->pcScene);
		delete pcProcess;
	}
	else if (ORIGINAL == iSet)
	{
		for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
		{
			if (this->apcMeshes[i]->pvOriginalNormals)
			{
				delete[] this->pcScene->mMeshes[i]->mNormals;
				this->pcScene->mMeshes[i]->mNormals = this->apcMeshes[i]->pvOriginalNormals;
				this->apcMeshes[i]->pvOriginalNormals = NULL;
			}
		}
	}

	// recalculate tangents and bitangents
	Assimp::BaseProcess* pcProcess = new MyCalcTangentsProcess();
	pcProcess->Execute(this->pcScene);
	delete pcProcess;

	// join the mesh vertices again
	pcProcess = new MyJoinVerticesProcess();
	pcProcess->Execute(this->pcScene);
	delete pcProcess;

	this->iNormalSet = iSet;

	if (g_bWasFlipped)
	{
		// invert all normal vectors
		for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
		{
			aiMesh* pcMesh = this->pcScene->mMeshes[i];
			for (unsigned int a = 0; a < pcMesh->mNumVertices;++a)
			{
				pcMesh->mNormals[a] *= -1.0f;
			}
		}
	}

	// recreate native data
	DeleteAssetData(true);
	CreateAssetData();
	return;
}

};