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Merge pull request #4174 from ifree/master 

glTF2 skinning related fixes
pull/4180/head v5.1.0
Kim Kulling 2021-11-13 09:30:32 +01:00 committed by GitHub
parent 4fa3648132 b1c336799c
commit 05115b07b4
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 30 additions and 7 deletions
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36
code/AssetLib/glTF2/glTF2Exporter.cpp
View File

@ -174,6 +174,22 @@ static void IdentityMatrix4(mat4 &o) {
o[15] = 1;
}
static bool IsBoneWeightFitted(vec4 &weight) {
return weight[0] + weight[1] + weight[2] + weight[3] >= 1.f;
}
static int FitBoneWeight(vec4 &weight, float value) {
int i = 0;
for (; i < 4; ++i) {
if (weight[i] < value) {
weight[i] = value;
return i;
}
}
return -1;
}
template <typename T>
void SetAccessorRange(Ref<Accessor> acc, void *data, size_t count,
unsigned int numCompsIn, unsigned int numCompsOut) {
@ -950,15 +966,21 @@ void ExportSkin(Asset &mAsset, const aiMesh *aimesh, Ref<Mesh> &meshRef, Ref<Buf
unsigned int vertexId = aib->mWeights[idx_weights].mVertexId;
float vertWeight = aib->mWeights[idx_weights].mWeight;
// A vertex can only have at most four joint weights. Ignore all others.
if (jointsPerVertex[vertexId] > 3) {
// A vertex can only have at most four joint weights, which ideally sum up to 1
if (IsBoneWeightFitted(vertexWeightData[vertexId])) {
continue;
}
if (jointsPerVertex[vertexId] > 3) {
int boneIndexFitted = FitBoneWeight(vertexWeightData[vertexId], vertWeight);
if (boneIndexFitted) {
vertexJointData[vertexId][boneIndexFitted] = static_cast<float>(jointNamesIndex);
}
}else {
vertexJointData[vertexId][jointsPerVertex[vertexId]] = static_cast<float>(jointNamesIndex);
vertexWeightData[vertexId][jointsPerVertex[vertexId]] = vertWeight;
vertexJointData[vertexId][jointsPerVertex[vertexId]] = static_cast<float>(jointNamesIndex);
vertexWeightData[vertexId][jointsPerVertex[vertexId]] = vertWeight;
jointsPerVertex[vertexId] += 1;
jointsPerVertex[vertexId] += 1;
}
}
} // End: for-loop mNumMeshes
@ -974,7 +996,7 @@ void ExportSkin(Asset &mAsset, const aiMesh *aimesh, Ref<Mesh> &meshRef, Ref<Buf
Ref<Buffer> buf = vertexJointAccessor->bufferView->buffer;
uint8_t *arrys = new uint8_t[bytesLen];
unsigned int i = 0;
for (unsigned int j = 0; j <= bytesLen; j += bytesPerComp) {
for (unsigned int j = 0; j < bytesLen; j += bytesPerComp) {
size_t len_p = offset + j;
float f_value = *(float *)&buf->GetPointer()[len_p];
unsigned short c = static_cast<unsigned short>(f_value);

1
code/PostProcessing/MakeVerboseFormat.cpp
View File

@ -161,6 +161,7 @@ bool MakeVerboseFormatProcess::MakeVerboseFormat(aiMesh *pcMesh) {
delete[] pcMesh->mBones[i]->mWeights;
if (!newWeights[i].empty()) {
pcMesh->mBones[i]->mWeights = new aiVertexWeight[newWeights[i].size()];
pcMesh->mBones[i]->mNumWeights = static_cast<unsigned int>(newWeights[i].size());
aiVertexWeight *weightToCopy = &(newWeights[i][0]);
memcpy(pcMesh->mBones[i]->mWeights, weightToCopy,
sizeof(aiVertexWeight) * newWeights[i].size());