assimp/code/GenFaceNormalsProcess.cpp

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/*
---------------------------------------------------------------------------
Open Asset Import Library (ASSIMP)
---------------------------------------------------------------------------
Copyright (c) 2006-2008, ASSIMP Development 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
conditions are met:
* 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
materials provided with the distribution.
* 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 Development 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,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
---------------------------------------------------------------------------
*/
/** @file Implementation of the post processing step to generate face
* normals for all imported faces.
*/
#include "AssimpPCH.h"
#include "GenFaceNormalsProcess.h"
using namespace Assimp;
// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
GenFaceNormalsProcess::GenFaceNormalsProcess()
{
// nothing to do here
}
// ------------------------------------------------------------------------------------------------
// Destructor, private as well
GenFaceNormalsProcess::~GenFaceNormalsProcess()
{
// nothing to do here
}
// ------------------------------------------------------------------------------------------------
// Returns whether the processing step is present in the given flag field.
bool GenFaceNormalsProcess::IsActive( unsigned int pFlags) const
{
return (pFlags & aiProcess_GenNormals) != 0;
}
// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
void GenFaceNormalsProcess::Execute( aiScene* pScene)
{
DefaultLogger::get()->debug("GenFaceNormalsProcess begin");
if (pScene->mFlags & AI_SCENE_FLAGS_NON_VERBOSE_FORMAT)
throw new ImportErrorException("Post-processing order mismatch: expecting pseudo-indexed (\"verbose\") vertices here");
bool bHas = false;
for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
{
if(this->GenMeshFaceNormals( pScene->mMeshes[a]))
bHas = true;
}
if (bHas)
{
DefaultLogger::get()->info("GenFaceNormalsProcess finished. "
"Face normals have been calculated");
}
else DefaultLogger::get()->debug("GenFaceNormalsProcess finished. "
"Normals are already there");
}
// ------------------------------------------------------------------------------------------------
// Executes the post processing step on the given imported data.
bool GenFaceNormalsProcess::GenMeshFaceNormals (aiMesh* pMesh)
{
if (NULL != pMesh->mNormals)return false;
// If the mesh consists of lines and/or points but not of
// triangles or higher-order polygons the normal vectors
// are undefined.
if (!(pMesh->mPrimitiveTypes & (aiPrimitiveType_TRIANGLE | aiPrimitiveType_POLYGON)))
{
DefaultLogger::get()->info("Normal vectors are undefined for line and point meshes");
return false;
}
// allocate an array to hold the output normals
pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
General - Added format auto-detection to most loaders - Simplified BaseImporter::CanRead() with some utility methods - improved fast_atof -> no overruns anymore. Fuck you, irrlicht. - added assimp_cmd tool to allow command line model processing. Mainly adebugging tool for internal purposes, but others might find it useful, too. - vc8/vc9: revision number is now written to DLL version header - mkutil: some batch scripts to simplify tagging & building of release versions - some API cleanup - fixing some doxygen markup (+now explicit use of @file <filename>) - Icon for assimp_view and assimp_cmd 3DS - Normal vectors are not anymore inverted in some cases - Improved pivot handling - Improved handling of x-flipped meshes Collada - fixed a minor bug (visual_scene element) LWS - WIP implementation. No animations yet, some bugs and crashes. - Animation system remains disabled, WIP code - many test files for LWS, but most of them test the anim support, which is, read above, currently disabled. STL - fixing a log warning which appears for every model - added binary&ascii test spider, exported from truespace MD3 - Cleaning up output tags for automatically joined player models. IRR - Fixing coordinate system issues. - Instance handling improved. - Some of the reported crashes not yet fixed. PretransformVertices - Numerous performance improvements. - Added config option to preserve the hierarchy during the step. RemoveRedundantMaterials - Added config option to specify a list of materials which are kept in every case. UNREAL - Added support for the old unreal data format (*.a,*.d,*.uc) - tested only with exports from Milkshape - more Unreal stuff to come soon git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@356 67173fc5-114c-0410-ac8e-9d2fd5bffc1f
2009-03-05 22:32:13 +00:00
const float qnan = get_qnan();
// iterate through all faces and compute per-face normals but store
// them per-vertex.
for( unsigned int a = 0; a < pMesh->mNumFaces; a++)
{
const aiFace& face = pMesh->mFaces[a];
if (face.mNumIndices < 3)
{
// either a point or a line -> no well-defined normal vector
for (unsigned int i = 0;i < face.mNumIndices;++i)
pMesh->mNormals[face.mIndices[i]] = qnan;
continue;
}
aiVector3D* pV1 = &pMesh->mVertices[face.mIndices[0]];
aiVector3D* pV2 = &pMesh->mVertices[face.mIndices[1]];
aiVector3D* pV3 = &pMesh->mVertices[face.mIndices[face.mNumIndices-1]];
aiVector3D vNor = (*pV2 - *pV1) ^ (*pV3 - *pV1).Normalize();
for (unsigned int i = 0;i < face.mNumIndices;++i)
pMesh->mNormals[face.mIndices[i]] = vNor;
}
return true;
}