void MayaMeshWriter::writeUVSets()
{
MStatus status = MS::kSuccess;
const MFnMesh lMesh(mDagPath, &status);
if (!status)
{
MGlobal::displayError(
"MFnMesh() failed for MayaMeshWriter::writeUV" );
return;
}
//Write uvs
const UVParamsVec::const_iterator uvItEnd = mUVparams.end();
for (UVParamsVec::iterator uvIt = mUVparams.begin();
uvIt != uvItEnd; ++uvIt)
{
std::vector<float> uvs;
std::vector<Alembic::Util::uint32_t> indices;
MString uvSetName(uvIt->getName().c_str());
getUVSet(lMesh, uvSetName, uvs, indices);
//cast the vector to the sample type
Alembic::AbcGeom::OV2fGeomParam::Sample sample(
Alembic::Abc::V2fArraySample(
(const Imath::V2f *) &uvs.front(), uvs.size() / 2),
Alembic::Abc::UInt32ArraySample(indices),
Alembic::AbcGeom::kFacevaryingScope);
uvIt->set(sample);
}
}
bool SuperShaderModelInfo::IsSecondUVSetNeeded()
{
FBModel *pModel = GetFBModel();
if (pModel == nullptr) return false;
FBGeometry *pGeometry = pModel->Geometry;
FBStringList uvSets = pGeometry->GetUVSets();
if (uvSets.GetCount() < 2 ) return false;
for (int i=0; i<pModel->Textures.GetCount(); ++i)
{
FBTexture *pTexture = pModel->Textures[i];
FBProperty *lProp = pTexture->PropertyList.Find( "UVSet" );
if (lProp)
{
FBString str( lProp->AsString() );
for (int j=1; j<uvSets.GetCount(); ++j)
{
FBString uvSetName(uvSets[j]);
if (str == uvSetName)
{
return true;
}
}
}
}
return false;
}
/* static */
bool
UsdMayaTranslatorMesh::_AssignUVSetPrimvarToMesh(
const UsdGeomPrimvar& primvar,
MFnMesh& meshFn)
{
const TfToken& primvarName = primvar.GetPrimvarName();
// Get the raw data before applying any indexing.
VtVec2fArray uvValues;
if (!primvar.Get(&uvValues) || uvValues.empty()) {
TF_WARN("Could not read UV values from primvar '%s' on mesh: %s",
primvarName.GetText(),
primvar.GetAttr().GetPrimPath().GetText());
return false;
}
// This is the number of UV values assuming the primvar is NOT indexed.
VtIntArray assignmentIndices;
if (primvar.GetIndices(&assignmentIndices)) {
// The primvar IS indexed, so the indices array is what determines the
// number of UV values.
int unauthoredValuesIndex = primvar.GetUnauthoredValuesIndex();
// Replace any index equal to unauthoredValuesIndex with -1.
if (unauthoredValuesIndex != -1) {
for (int& index : assignmentIndices) {
if (index == unauthoredValuesIndex) {
index = -1;
}
}
}
// Furthermore, if unauthoredValuesIndex is valid for uvValues, then
// remove it from uvValues and shift the indices (we don't want to
// import the unauthored value into Maya, where it has no meaning).
if (unauthoredValuesIndex >= 0 &&
static_cast<size_t>(unauthoredValuesIndex) < uvValues.size()) {
// This moves [unauthoredValuesIndex + 1, end) to
// [unauthoredValuesIndex, end - 1), erasing the
// unauthoredValuesIndex.
std::move(
uvValues.begin() + unauthoredValuesIndex + 1,
uvValues.end(),
uvValues.begin() + unauthoredValuesIndex);
uvValues.pop_back();
for (int& index : assignmentIndices) {
if (index > unauthoredValuesIndex) {
index = index - 1;
}
}
}
}
// Go through the UV data and add the U and V values to separate
// MFloatArrays.
MFloatArray uCoords;
MFloatArray vCoords;
for (const GfVec2f& v : uvValues) {
uCoords.append(v[0]);
vCoords.append(v[1]);
}
MStatus status;
MString uvSetName(primvarName.GetText());
if (primvarName == UsdUtilsGetPrimaryUVSetName()) {
// We assume that the primary USD UV set maps to Maya's default 'map1'
// set which always exists, so we shouldn't try to create it.
uvSetName = "map1";
} else {
status = meshFn.createUVSet(uvSetName);
if (status != MS::kSuccess) {
TF_WARN("Unable to create UV set '%s' for mesh: %s",
uvSetName.asChar(),
meshFn.fullPathName().asChar());
return false;
}
}
// The following two lines should have no effect on user-visible state but
// prevent a Maya crash in MFnMesh.setUVs after creating a crease set.
// XXX this workaround is needed pending a fix by Autodesk.
MString currentSet = meshFn.currentUVSetName();
meshFn.setCurrentUVSetName(currentSet);
// Create UVs on the mesh from the values we collected out of the primvar.
// We'll assign mesh components to these values below.
status = meshFn.setUVs(uCoords, vCoords, &uvSetName);
if (status != MS::kSuccess) {
TF_WARN("Unable to set UV data on UV set '%s' for mesh: %s",
uvSetName.asChar(),
meshFn.fullPathName().asChar());
return false;
}
const TfToken& interpolation = primvar.GetInterpolation();
// Build an array of value assignments for each face vertex in the mesh.
// Any assignments left as -1 will not be assigned a value.
MIntArray uvIds = _GetMayaFaceVertexAssignmentIds(meshFn,
interpolation,
assignmentIndices,
-1);
MIntArray vertexCounts;
MIntArray vertexList;
status = meshFn.getVertices(vertexCounts, vertexList);
if (status != MS::kSuccess) {
TF_WARN("Could not get vertex counts for UV set '%s' on mesh: %s",
uvSetName.asChar(),
meshFn.fullPathName().asChar());
return false;
}
status = meshFn.assignUVs(vertexCounts, uvIds, &uvSetName);
if (status != MS::kSuccess) {
TF_WARN("Could not assign UV values to UV set '%s' on mesh: %s",
uvSetName.asChar(),
meshFn.fullPathName().asChar());
return false;
}
return true;
}
