da1f80c1f2
This reverts commit 78b22393a8.
It caused a regression in FBX import leading to crashes.
Fixes #36908.
202 lines
7.5 KiB
C++
202 lines
7.5 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2019, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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/** Implementation of the LimitBoneWeightsProcess post processing step */
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#include "LimitBoneWeightsProcess.h"
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#include <assimp/StringUtils.h>
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#include <assimp/postprocess.h>
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#include <assimp/DefaultLogger.hpp>
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#include <assimp/scene.h>
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#include <stdio.h>
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using namespace Assimp;
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// ------------------------------------------------------------------------------------------------
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// Constructor to be privately used by Importer
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LimitBoneWeightsProcess::LimitBoneWeightsProcess()
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{
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mMaxWeights = AI_LMW_MAX_WEIGHTS;
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}
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// ------------------------------------------------------------------------------------------------
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// Destructor, private as well
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LimitBoneWeightsProcess::~LimitBoneWeightsProcess()
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{
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// nothing to do here
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}
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// ------------------------------------------------------------------------------------------------
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// Returns whether the processing step is present in the given flag field.
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bool LimitBoneWeightsProcess::IsActive( unsigned int pFlags) const
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{
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return (pFlags & aiProcess_LimitBoneWeights) != 0;
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}
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// ------------------------------------------------------------------------------------------------
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// Executes the post processing step on the given imported data.
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void LimitBoneWeightsProcess::Execute( aiScene* pScene) {
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ASSIMP_LOG_DEBUG("LimitBoneWeightsProcess begin");
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for (unsigned int a = 0; a < pScene->mNumMeshes; ++a ) {
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ProcessMesh(pScene->mMeshes[a]);
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}
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ASSIMP_LOG_DEBUG("LimitBoneWeightsProcess end");
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}
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// ------------------------------------------------------------------------------------------------
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// Executes the post processing step on the given imported data.
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void LimitBoneWeightsProcess::SetupProperties(const Importer* pImp)
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{
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// get the current value of the property
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this->mMaxWeights = pImp->GetPropertyInteger(AI_CONFIG_PP_LBW_MAX_WEIGHTS,AI_LMW_MAX_WEIGHTS);
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}
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// ------------------------------------------------------------------------------------------------
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// Unites identical vertices in the given mesh
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void LimitBoneWeightsProcess::ProcessMesh( aiMesh* pMesh)
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{
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if( !pMesh->HasBones())
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return;
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// collect all bone weights per vertex
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typedef std::vector< std::vector< Weight > > WeightsPerVertex;
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WeightsPerVertex vertexWeights( pMesh->mNumVertices);
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// collect all weights per vertex
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for( unsigned int a = 0; a < pMesh->mNumBones; a++)
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{
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const aiBone* bone = pMesh->mBones[a];
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for( unsigned int b = 0; b < bone->mNumWeights; b++)
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{
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const aiVertexWeight& w = bone->mWeights[b];
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vertexWeights[w.mVertexId].push_back( Weight( a, w.mWeight));
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}
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}
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unsigned int removed = 0, old_bones = pMesh->mNumBones;
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// now cut the weight count if it exceeds the maximum
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bool bChanged = false;
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for( WeightsPerVertex::iterator vit = vertexWeights.begin(); vit != vertexWeights.end(); ++vit)
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{
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if( vit->size() <= mMaxWeights)
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continue;
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bChanged = true;
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// more than the defined maximum -> first sort by weight in descending order. That's
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// why we defined the < operator in such a weird way.
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std::sort( vit->begin(), vit->end());
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// now kill everything beyond the maximum count
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unsigned int m = static_cast<unsigned int>(vit->size());
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vit->erase( vit->begin() + mMaxWeights, vit->end());
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removed += static_cast<unsigned int>(m-vit->size());
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// and renormalize the weights
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float sum = 0.0f;
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for( std::vector<Weight>::const_iterator it = vit->begin(); it != vit->end(); ++it ) {
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sum += it->mWeight;
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}
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if( 0.0f != sum ) {
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const float invSum = 1.0f / sum;
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for( std::vector<Weight>::iterator it = vit->begin(); it != vit->end(); ++it ) {
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it->mWeight *= invSum;
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}
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}
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}
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if (bChanged) {
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// rebuild the vertex weight array for all bones
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typedef std::vector< std::vector< aiVertexWeight > > WeightsPerBone;
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WeightsPerBone boneWeights( pMesh->mNumBones);
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for( unsigned int a = 0; a < vertexWeights.size(); a++)
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{
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const std::vector<Weight>& vw = vertexWeights[a];
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for( std::vector<Weight>::const_iterator it = vw.begin(); it != vw.end(); ++it)
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boneWeights[it->mBone].push_back( aiVertexWeight( a, it->mWeight));
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}
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// and finally copy the vertex weight list over to the mesh's bones
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std::vector<bool> abNoNeed(pMesh->mNumBones,false);
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bChanged = false;
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for( unsigned int a = 0; a < pMesh->mNumBones; a++)
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{
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const std::vector<aiVertexWeight>& bw = boneWeights[a];
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aiBone* bone = pMesh->mBones[a];
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if ( bw.empty() )
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{
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abNoNeed[a] = bChanged = true;
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continue;
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}
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// copy the weight list. should always be less weights than before, so we don't need a new allocation
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ai_assert( bw.size() <= bone->mNumWeights);
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bone->mNumWeights = static_cast<unsigned int>( bw.size() );
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::memcpy( bone->mWeights, &bw[0], bw.size() * sizeof( aiVertexWeight));
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}
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if (bChanged) {
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// the number of new bones is smaller than before, so we can reuse the old array
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aiBone** ppcCur = pMesh->mBones;aiBone** ppcSrc = ppcCur;
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for (std::vector<bool>::const_iterator iter = abNoNeed.begin();iter != abNoNeed.end() ;++iter) {
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if (*iter) {
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delete *ppcSrc;
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--pMesh->mNumBones;
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}
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else *ppcCur++ = *ppcSrc;
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++ppcSrc;
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}
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}
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if (!DefaultLogger::isNullLogger()) {
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ASSIMP_LOG_INFO_F("Removed ", removed, " weights. Input bones: ", old_bones, ". Output bones: ", pMesh->mNumBones );
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}
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}
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}
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