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annotate libs/assimp/LimitBoneWeightsProcess.cpp @ 3:c179c72369be

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rename candy->vr
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 03 Feb 2014 08:52:13 +0200
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nuclear@0 1 /*
nuclear@0 2 Open Asset Import Library (assimp)
nuclear@0 3 ----------------------------------------------------------------------
nuclear@0 4
nuclear@0 5 Copyright (c) 2006-2012, assimp team
nuclear@0 6 All rights reserved.
nuclear@0 7
nuclear@0 8 Redistribution and use of this software in source and binary forms,
nuclear@0 9 with or without modification, are permitted provided that the
nuclear@0 10 following conditions are met:
nuclear@0 11
nuclear@0 12 * Redistributions of source code must retain the above
nuclear@0 13 copyright notice, this list of conditions and the
nuclear@0 14 following disclaimer.
nuclear@0 15
nuclear@0 16 * Redistributions in binary form must reproduce the above
nuclear@0 17 copyright notice, this list of conditions and the
nuclear@0 18 following disclaimer in the documentation and/or other
nuclear@0 19 materials provided with the distribution.
nuclear@0 20
nuclear@0 21 * Neither the name of the assimp team, nor the names of its
nuclear@0 22 contributors may be used to endorse or promote products
nuclear@0 23 derived from this software without specific prior
nuclear@0 24 written permission of the assimp team.
nuclear@0 25
nuclear@0 26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
nuclear@0 27 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
nuclear@0 28 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
nuclear@0 29 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
nuclear@0 30 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
nuclear@0 31 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
nuclear@0 32 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
nuclear@0 33 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
nuclear@0 34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
nuclear@0 35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
nuclear@0 36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
nuclear@0 37
nuclear@0 38 ----------------------------------------------------------------------
nuclear@0 39 */
nuclear@0 40
nuclear@0 41 /** Implementation of the LimitBoneWeightsProcess post processing step */
nuclear@0 42
nuclear@0 43 #include "AssimpPCH.h"
nuclear@0 44 #include "LimitBoneWeightsProcess.h"
nuclear@0 45
nuclear@0 46
nuclear@0 47 using namespace Assimp;
nuclear@0 48
nuclear@0 49
nuclear@0 50 // ------------------------------------------------------------------------------------------------
nuclear@0 51 // Constructor to be privately used by Importer
nuclear@0 52 LimitBoneWeightsProcess::LimitBoneWeightsProcess()
nuclear@0 53 {
nuclear@0 54 mMaxWeights = AI_LMW_MAX_WEIGHTS;
nuclear@0 55 }
nuclear@0 56
nuclear@0 57 // ------------------------------------------------------------------------------------------------
nuclear@0 58 // Destructor, private as well
nuclear@0 59 LimitBoneWeightsProcess::~LimitBoneWeightsProcess()
nuclear@0 60 {
nuclear@0 61 // nothing to do here
nuclear@0 62 }
nuclear@0 63
nuclear@0 64 // ------------------------------------------------------------------------------------------------
nuclear@0 65 // Returns whether the processing step is present in the given flag field.
nuclear@0 66 bool LimitBoneWeightsProcess::IsActive( unsigned int pFlags) const
nuclear@0 67 {
nuclear@0 68 return (pFlags & aiProcess_LimitBoneWeights) != 0;
nuclear@0 69 }
nuclear@0 70
nuclear@0 71 // ------------------------------------------------------------------------------------------------
nuclear@0 72 // Executes the post processing step on the given imported data.
nuclear@0 73 void LimitBoneWeightsProcess::Execute( aiScene* pScene)
nuclear@0 74 {
nuclear@0 75 DefaultLogger::get()->debug("LimitBoneWeightsProcess begin");
nuclear@0 76 for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
nuclear@0 77 ProcessMesh( pScene->mMeshes[a]);
nuclear@0 78
nuclear@0 79 DefaultLogger::get()->debug("LimitBoneWeightsProcess end");
nuclear@0 80 }
nuclear@0 81
nuclear@0 82 // ------------------------------------------------------------------------------------------------
nuclear@0 83 // Executes the post processing step on the given imported data.
nuclear@0 84 void LimitBoneWeightsProcess::SetupProperties(const Importer* pImp)
nuclear@0 85 {
nuclear@0 86 // get the current value of the property
nuclear@0 87 this->mMaxWeights = pImp->GetPropertyInteger(AI_CONFIG_PP_LBW_MAX_WEIGHTS,AI_LMW_MAX_WEIGHTS);
nuclear@0 88 }
nuclear@0 89
nuclear@0 90 // ------------------------------------------------------------------------------------------------
nuclear@0 91 // Unites identical vertices in the given mesh
nuclear@0 92 void LimitBoneWeightsProcess::ProcessMesh( aiMesh* pMesh)
nuclear@0 93 {
nuclear@0 94 if( !pMesh->HasBones())
nuclear@0 95 return;
nuclear@0 96
nuclear@0 97 // collect all bone weights per vertex
nuclear@0 98 typedef std::vector< std::vector< Weight > > WeightsPerVertex;
nuclear@0 99 WeightsPerVertex vertexWeights( pMesh->mNumVertices);
nuclear@0 100
nuclear@0 101 // collect all weights per vertex
nuclear@0 102 for( unsigned int a = 0; a < pMesh->mNumBones; a++)
nuclear@0 103 {
nuclear@0 104 const aiBone* bone = pMesh->mBones[a];
nuclear@0 105 for( unsigned int b = 0; b < bone->mNumWeights; b++)
nuclear@0 106 {
nuclear@0 107 const aiVertexWeight& w = bone->mWeights[b];
nuclear@0 108 vertexWeights[w.mVertexId].push_back( Weight( a, w.mWeight));
nuclear@0 109 }
nuclear@0 110 }
nuclear@0 111
nuclear@0 112 unsigned int removed = 0, old_bones = pMesh->mNumBones;
nuclear@0 113
nuclear@0 114 // now cut the weight count if it exceeds the maximum
nuclear@0 115 bool bChanged = false;
nuclear@0 116 for( WeightsPerVertex::iterator vit = vertexWeights.begin(); vit != vertexWeights.end(); ++vit)
nuclear@0 117 {
nuclear@0 118 if( vit->size() <= mMaxWeights)
nuclear@0 119 continue;
nuclear@0 120
nuclear@0 121 bChanged = true;
nuclear@0 122
nuclear@0 123 // more than the defined maximum -> first sort by weight in descending order. That's
nuclear@0 124 // why we defined the < operator in such a weird way.
nuclear@0 125 std::sort( vit->begin(), vit->end());
nuclear@0 126
nuclear@0 127 // now kill everything beyond the maximum count
nuclear@0 128 unsigned int m = vit->size();
nuclear@0 129 vit->erase( vit->begin() + mMaxWeights, vit->end());
nuclear@0 130 removed += m-vit->size();
nuclear@0 131
nuclear@0 132 // and renormalize the weights
nuclear@0 133 float sum = 0.0f;
nuclear@0 134 for( std::vector<Weight>::const_iterator it = vit->begin(); it != vit->end(); ++it)
nuclear@0 135 sum += it->mWeight;
nuclear@0 136 for( std::vector<Weight>::iterator it = vit->begin(); it != vit->end(); ++it)
nuclear@0 137 it->mWeight /= sum;
nuclear@0 138 }
nuclear@0 139
nuclear@0 140 if (bChanged) {
nuclear@0 141 // rebuild the vertex weight array for all bones
nuclear@0 142 typedef std::vector< std::vector< aiVertexWeight > > WeightsPerBone;
nuclear@0 143 WeightsPerBone boneWeights( pMesh->mNumBones);
nuclear@0 144 for( unsigned int a = 0; a < vertexWeights.size(); a++)
nuclear@0 145 {
nuclear@0 146 const std::vector<Weight>& vw = vertexWeights[a];
nuclear@0 147 for( std::vector<Weight>::const_iterator it = vw.begin(); it != vw.end(); ++it)
nuclear@0 148 boneWeights[it->mBone].push_back( aiVertexWeight( a, it->mWeight));
nuclear@0 149 }
nuclear@0 150
nuclear@0 151 // and finally copy the vertex weight list over to the mesh's bones
nuclear@0 152 std::vector<bool> abNoNeed(pMesh->mNumBones,false);
nuclear@0 153 bChanged = false;
nuclear@0 154
nuclear@0 155 for( unsigned int a = 0; a < pMesh->mNumBones; a++)
nuclear@0 156 {
nuclear@0 157 const std::vector<aiVertexWeight>& bw = boneWeights[a];
nuclear@0 158 aiBone* bone = pMesh->mBones[a];
nuclear@0 159
nuclear@0 160 // ignore the bone if no vertex weights were removed there
nuclear@0 161
nuclear@0 162 // FIX (Aramis, 07|22|08)
nuclear@0 163 // NO! we can't ignore it in this case ... it is possible that
nuclear@0 164 // the number of weights did not change, but the weight values did.
nuclear@0 165
nuclear@0 166 // if( bw.size() == bone->mNumWeights)
nuclear@0 167 // continue;
nuclear@0 168
nuclear@0 169 // FIX (Aramis, 07|21|08)
nuclear@0 170 // It is possible that all weights of a bone have been removed.
nuclear@0 171 // This would naturally cause an exception in &bw[0].
nuclear@0 172 if ( bw.empty() )
nuclear@0 173 {
nuclear@0 174 abNoNeed[a] = bChanged = true;
nuclear@0 175 continue;
nuclear@0 176 }
nuclear@0 177
nuclear@0 178 // copy the weight list. should always be less weights than before, so we don't need a new allocation
nuclear@0 179 ai_assert( bw.size() <= bone->mNumWeights);
nuclear@0 180 bone->mNumWeights = (unsigned int) bw.size();
nuclear@0 181 ::memcpy( bone->mWeights, &bw[0], bw.size() * sizeof( aiVertexWeight));
nuclear@0 182 }
nuclear@0 183
nuclear@0 184 if (bChanged) {
nuclear@0 185 // the number of new bones is smaller than before, so we can reuse the old array
nuclear@0 186 aiBone** ppcCur = pMesh->mBones;aiBone** ppcSrc = ppcCur;
nuclear@0 187
nuclear@0 188 for (std::vector<bool>::const_iterator iter = abNoNeed.begin();iter != abNoNeed.end() ;++iter) {
nuclear@0 189 if (*iter) {
nuclear@0 190 delete *ppcSrc;
nuclear@0 191 --pMesh->mNumBones;
nuclear@0 192 }
nuclear@0 193 else *ppcCur++ = *ppcSrc;
nuclear@0 194 ++ppcSrc;
nuclear@0 195 }
nuclear@0 196 }
nuclear@0 197
nuclear@0 198 if (!DefaultLogger::isNullLogger()) {
nuclear@0 199 char buffer[1024];
nuclear@0 200 ::sprintf(buffer,"Removed %i weights. Input bones: %i. Output bones: %i",removed,old_bones,pMesh->mNumBones);
nuclear@0 201 DefaultLogger::get()->info(buffer);
nuclear@0 202 }
nuclear@0 203 }
nuclear@0 204 }