1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/assimp/GenFaceNormalsProcess.cpp	Sat Feb 01 19:58:19 2014 +0200
     1.3 @@ -0,0 +1,138 @@
     1.4 +/*
     1.5 +---------------------------------------------------------------------------
     1.6 +Open Asset Import Library (assimp)
     1.7 +---------------------------------------------------------------------------
     1.8 +
     1.9 +Copyright (c) 2006-2012, assimp team
    1.10 +
    1.11 +All rights reserved.
    1.12 +
    1.13 +Redistribution and use of this software in source and binary forms, 
    1.14 +with or without modification, are permitted provided that the following 
    1.15 +conditions are met:
    1.16 +
    1.17 +* Redistributions of source code must retain the above
    1.18 +  copyright notice, this list of conditions and the
    1.19 +  following disclaimer.
    1.20 +
    1.21 +* Redistributions in binary form must reproduce the above
    1.22 +  copyright notice, this list of conditions and the
    1.23 +  following disclaimer in the documentation and/or other
    1.24 +  materials provided with the distribution.
    1.25 +
    1.26 +* Neither the name of the assimp team, nor the names of its
    1.27 +  contributors may be used to endorse or promote products
    1.28 +  derived from this software without specific prior
    1.29 +  written permission of the assimp team.
    1.30 +
    1.31 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
    1.32 +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
    1.33 +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    1.34 +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
    1.35 +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    1.36 +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
    1.37 +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    1.38 +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
    1.39 +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
    1.40 +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
    1.41 +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    1.42 +---------------------------------------------------------------------------
    1.43 +*/
    1.44 +
    1.45 +/** @file Implementation of the post processing step to generate face
    1.46 +* normals for all imported faces.
    1.47 +*/
    1.48 +
    1.49 +#include "AssimpPCH.h"
    1.50 +#include "GenFaceNormalsProcess.h"
    1.51 +
    1.52 +
    1.53 +using namespace Assimp;
    1.54 +
    1.55 +// ------------------------------------------------------------------------------------------------
    1.56 +// Constructor to be privately used by Importer
    1.57 +GenFaceNormalsProcess::GenFaceNormalsProcess()
    1.58 +{
    1.59 +	// nothing to do here
    1.60 +}
    1.61 +
    1.62 +// ------------------------------------------------------------------------------------------------
    1.63 +// Destructor, private as well
    1.64 +GenFaceNormalsProcess::~GenFaceNormalsProcess()
    1.65 +{
    1.66 +	// nothing to do here
    1.67 +}
    1.68 +
    1.69 +// ------------------------------------------------------------------------------------------------
    1.70 +// Returns whether the processing step is present in the given flag field.
    1.71 +bool GenFaceNormalsProcess::IsActive( unsigned int pFlags) const
    1.72 +{
    1.73 +	return	(pFlags & aiProcess_GenNormals) != 0;
    1.74 +}
    1.75 +
    1.76 +// ------------------------------------------------------------------------------------------------
    1.77 +// Executes the post processing step on the given imported data.
    1.78 +void GenFaceNormalsProcess::Execute( aiScene* pScene)
    1.79 +{
    1.80 +	DefaultLogger::get()->debug("GenFaceNormalsProcess begin");
    1.81 +
    1.82 +	if (pScene->mFlags & AI_SCENE_FLAGS_NON_VERBOSE_FORMAT) {
    1.83 +		throw DeadlyImportError("Post-processing order mismatch: expecting pseudo-indexed (\"verbose\") vertices here");
    1.84 +	}
    1.85 +
    1.86 +	bool bHas = false;
    1.87 +	for( unsigned int a = 0; a < pScene->mNumMeshes; a++)	{
    1.88 +		if(this->GenMeshFaceNormals( pScene->mMeshes[a])) {
    1.89 +			bHas = true;
    1.90 +		}
    1.91 +	}
    1.92 +	if (bHas)	{
    1.93 +		DefaultLogger::get()->info("GenFaceNormalsProcess finished. "
    1.94 +			"Face normals have been calculated");
    1.95 +	}
    1.96 +	else DefaultLogger::get()->debug("GenFaceNormalsProcess finished. "
    1.97 +		"Normals are already there");
    1.98 +}
    1.99 +
   1.100 +// ------------------------------------------------------------------------------------------------
   1.101 +// Executes the post processing step on the given imported data.
   1.102 +bool GenFaceNormalsProcess::GenMeshFaceNormals (aiMesh* pMesh)
   1.103 +{
   1.104 +	if (NULL != pMesh->mNormals) {
   1.105 +		return false;
   1.106 +	}
   1.107 +
   1.108 +	// If the mesh consists of lines and/or points but not of
   1.109 +	// triangles or higher-order polygons the normal vectors
   1.110 +	// are undefined.
   1.111 +	if (!(pMesh->mPrimitiveTypes & (aiPrimitiveType_TRIANGLE | aiPrimitiveType_POLYGON)))	{
   1.112 +		DefaultLogger::get()->info("Normal vectors are undefined for line and point meshes");
   1.113 +		return false;
   1.114 +	}
   1.115 +
   1.116 +	// allocate an array to hold the output normals
   1.117 +	pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
   1.118 +	const float qnan = get_qnan();
   1.119 +
   1.120 +	// iterate through all faces and compute per-face normals but store them per-vertex. 
   1.121 +	for( unsigned int a = 0; a < pMesh->mNumFaces; a++)	{
   1.122 +		const aiFace& face = pMesh->mFaces[a];
   1.123 +		if (face.mNumIndices < 3)	{
   1.124 +			// either a point or a line -> no well-defined normal vector
   1.125 +			for (unsigned int i = 0;i < face.mNumIndices;++i) {
   1.126 +				pMesh->mNormals[face.mIndices[i]] = aiVector3D(qnan);
   1.127 +			}
   1.128 +			continue;
   1.129 +		}
   1.130 +
   1.131 +		const aiVector3D* pV1 = &pMesh->mVertices[face.mIndices[0]];
   1.132 +		const aiVector3D* pV2 = &pMesh->mVertices[face.mIndices[1]];
   1.133 +		const aiVector3D* pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices-1]];
   1.134 +		const aiVector3D vNor = ((*pV2 - *pV1) ^ (*pV3 - *pV1)).Normalize();
   1.135 +
   1.136 +		for (unsigned int i = 0;i < face.mNumIndices;++i) {
   1.137 +			pMesh->mNormals[face.mIndices[i]] = vNor;
   1.138 +		}
   1.139 +	}
   1.140 +	return true;
   1.141 +}