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Add support for tangents in glTF2.0 import

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Closes #1562
This commit is contained in:
awefers
2017-11-27 13:45:15 -05:00
committed by Daniel Hritzkiv
parent 0ce3641deb
commit 0031165789
3 changed files with 30 additions and 3 deletions
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26
code/glTF2Importer.cpp
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@@ -362,7 +362,31 @@ void glTF2Importer::ImportMeshes(glTF2::Asset& r)
attr.position[0]->ExtractData(aim->mVertices);
}
if (attr.normal.size() > 0 && attr.normal[0]) attr.normal[0]->ExtractData(aim->mNormals);
if (attr.normal.size() > 0 && attr.normal[0]) {
attr.normal[0]->ExtractData(aim->mNormals);
// only extract tangents if normals are present
if (attr.tangent.size() > 0 && attr.tangent[0]) {
// generate bitangents from normals and tangents according to spec
struct Tangent
{
aiVector3D xyz;
ai_real w;
} *tangents = nullptr;
attr.tangent[0]->ExtractData(tangents);
aim->mTangents = new aiVector3D[aim->mNumVertices];
aim->mBitangents = new aiVector3D[aim->mNumVertices];
for (unsigned int i = 0; i < aim->mNumVertices; ++i) {
aim->mTangents[i] = tangents[i].xyz;
aim->mBitangents[i] = (aim->mNormals[i] ^ tangents[i].xyz) * tangents[i].w;
}
delete tangents;
}
}
for (size_t tc = 0; tc < attr.texcoord.size() && tc < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++tc) {
attr.texcoord[tc]->ExtractData(aim->mTextureCoords[tc]);