UsdPrim
PxrUsdMayaShadingModeExportContext::MakeStandardMaterialPrim(
const AssignmentVector& assignmentsToBind,
const std::string& name) const
{
UsdPrim ret;
std::string materialName = name;
if (materialName.empty()) {
MStatus status;
MFnDependencyNode seDepNode(_shadingEngine, &status);
if (!status) {
return ret;
}
MString seName = seDepNode.name();
materialName = MNamespace::stripNamespaceFromName(seName).asChar();
}
materialName = PxrUsdMayaUtil::SanitizeName(materialName);
UsdStageRefPtr stage = GetUsdStage();
if (UsdPrim materialParent = _GetMaterialParent(stage, assignmentsToBind)) {
SdfPath materialPath = materialParent.GetPath().AppendChild(
TfToken(materialName));
UsdShadeMaterial material = UsdShadeMaterial::Define(
GetUsdStage(), materialPath);
UsdPrim materialPrim = material.GetPrim();
// could use this to determine where we want to export.
TF_FOR_ALL(iter, assignmentsToBind) {
const SdfPath &boundPrimPath = iter->first;
const VtIntArray &faceIndices = iter->second;
UsdPrim boundPrim = stage->OverridePrim(boundPrimPath);
if (faceIndices.empty()) {
material.Bind(boundPrim);
} else if (TfGetEnvSetting(PIXMAYA_EXPORT_OLD_STYLE_FACESETS)) {
UsdGeomFaceSetAPI faceSet = material.CreateMaterialFaceSet(
boundPrim);
faceSet.AppendFaceGroup(faceIndices, materialPath);
} else {
// It might be worth adding a utility method for the following
// block of code in core.
UsdGeomSubset faceSubset =
UsdShadeMaterial::CreateMaterialBindFaceSubset(
UsdGeomImageable(boundPrim),
/* subsetName */ TfToken(materialName),
faceIndices);
material.Bind(faceSubset.GetPrim());
UsdShadeMaterial::SetMaterialBindFaceSubsetsFamilyType(
UsdGeomImageable(boundPrim),
UsdGeomSubset::FamilyType::Partition);
}
}
return materialPrim;
}
static bool
_AppendFaceGroup(const UsdGeomFaceSetAPI &self,
object indices,
const SdfPath &bindingTarget,
const UsdTimeCode &time)
{
VtValue indicesVal = UsdPythonToSdfType(indices, SdfValueTypeNames->IntArray);
if (indicesVal.IsHolding<VtIntArray>()) {
return self.AppendFaceGroup(indicesVal.UncheckedGet<VtIntArray>(),
bindingTarget, time);
}
return false;
}