assimp/tools/assimp_view/Normals.cpp

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

Copyright (c) 2006-2012, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
with or without modification, are permitted provided that the following 
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* Redistributions of source code must retain the above
  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
  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/


#include "assimp_view.h"

// note: these are no longer part of the public API, but they are 
// exported on Windows to keep AssimpView alive.
#include "GenFaceNormalsProcess.h"
#include "GenVertexNormalsProcess.h"
#include "JoinVerticesProcess.h"
#include "CalcTangentsProcess.h"
#include "MakeVerboseFormat.h"

namespace AssimpView {

using namespace Assimp;

bool g_bWasFlipped = false;
float g_smoothAngle = 80.f;

//-------------------------------------------------------------------------------
// Flip all normal vectors
//-------------------------------------------------------------------------------
void AssetHelper::FlipNormalsInt()
{
	// invert all normal vectors
	for (unsigned int i = 0; i < this->pcScene->mNumMeshes;++i)
	{
		aiMesh* pcMesh = this->pcScene->mMeshes[i];
	
		if (!pcMesh->mNormals)
			continue;

		for (unsigned int a = 0; a < pcMesh->mNumVertices;++a){
			pcMesh->mNormals[a] *= -1.0f;
		}
	}
}

//-------------------------------------------------------------------------------
void AssetHelper::FlipNormals()
{
	FlipNormalsInt();

	// recreate native data
	DeleteAssetData(true);
	CreateAssetData();
	g_bWasFlipped = ! g_bWasFlipped;
}

//-------------------------------------------------------------------------------
// Set the normal set of the scene
//-------------------------------------------------------------------------------
void AssetHelper::SetNormalSet(unsigned int iSet)
{
	// we need to build an unique set of vertices for this ...
	{
		MakeVerboseFormatProcess* pcProcess = new MakeVerboseFormatProcess();
		pcProcess->Execute(pcScene);
		delete pcProcess;

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


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

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

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

	iNormalSet = iSet;

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

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

};