// Propagate objectGroups from inMesh to subdivided outMesh
// Note: Currently only supporting facet groups (for per-facet shading)
MStatus
createSmoothMesh_objectGroups(const MFnMeshData &inMeshDat,
int subdivisionLevel, MFnMeshData &newMeshDat) {
MStatus returnStatus;
int facesPerBaseFace = (int)(pow(4.0f, subdivisionLevel));
MIntArray newCompElems;
for(unsigned int gi=0; gi < inMeshDat.objectGroupCount(); gi++) {
unsigned int compId = inMeshDat.objectGroup(gi, &returnStatus);
MCHECKERR(returnStatus, "cannot get objectGroup() comp ID.");
MFn::Type compType = inMeshDat.objectGroupType(compId, &returnStatus);
MCHECKERR(returnStatus, "cannot get objectGroupType().");
// get elements from inMesh objectGroupComponent
MIntArray compElems;
MFnSingleIndexedComponent compFn(inMeshDat.objectGroupComponent(compId), &returnStatus );
MCHECKERR(returnStatus, "cannot get MFnSingleIndexedComponent for inMeshDat.objectGroupComponent().");
compFn.getElements(compElems);
// Only supporting kMeshPolygonComponent ObjectGroups at this time
// Skip the other types
if (compType == MFn::kMeshPolygonComponent) {
// convert/populate newCompElems from compElems of inMesh
// (with new face indices) to outMesh
newCompElems.setLength( compElems.length() * facesPerBaseFace );
for (unsigned int i=0; i < compElems.length(); i++) {
int startElemIndex = i * facesPerBaseFace;
int startElemValue = compElems[i] * facesPerBaseFace;
for (int j=0; j < facesPerBaseFace; j++) {
newCompElems[startElemIndex+j] = startElemValue+j;
}
}
// create comp
createComp(newMeshDat, compType, compId, newCompElems);
}
}
return MS::kSuccess;
}
// Propagate objectGroups from inMesh to subdivided outMesh
// Note: Currently only supporting facet groups (for per-facet shading)
MStatus
createSmoothMesh_objectGroups( MFnMesh const & inMeshFn,
MFnMeshData const & inMeshDat, MFnMeshData &newMeshDat, int level, int numSubfaces ) {
MStatus status;
MIntArray newCompElems;
std::vector<unsigned int> offsets; // mapping of offsets for subdivided faces
for(unsigned int gi=0; gi<inMeshDat.objectGroupCount(); gi++) {
unsigned int compId = inMeshDat.objectGroup(gi, &status);
MCHECKERR(status, "cannot get objectGroup() comp ID.");
MFn::Type compType = inMeshDat.objectGroupType(compId, &status);
MCHECKERR(status, "cannot get objectGroupType().");
// Only supporting kMeshPolygonComponent ObjectGroups at this time
// Skip the other types
if (compType == MFn::kMeshPolygonComponent) {
// get elements from inMesh objectGroupComponent
MIntArray compElems;
MFnSingleIndexedComponent compFn(
inMeshDat.objectGroupComponent(compId), &status );
MCHECKERR(status, "cannot get MFnSingleIndexedComponent for inMeshDat.objectGroupComponent().");
compFn.getElements(compElems);
if (compElems.length()==0) {
continue;
}
// over-allocation to maximum possible length
newCompElems.setLength( numSubfaces );
if (offsets.empty()) {
// lazy population of the subface offsets table
int nfaces = inMeshFn.numPolygons();
offsets.resize(nfaces);
for (int i=0, count=0; i<nfaces; ++i) {
int nverts = inMeshFn.polygonVertexCount(i),
nsubfaces = computeNumSubfaces(nverts, level);
offsets[i] = count;
count+=nsubfaces;
}
}
unsigned int idx = 0;
// convert/populate newCompElems from compElems of inMesh
// (with new face indices) to outMesh
for (unsigned int i=0; i < compElems.length(); i++) {
int nverts = inMeshFn.polygonVertexCount(compElems[i]),
nsubfaces = computeNumSubfaces(nverts, level);
unsigned int subFaceOffset = offsets[compElems[i]];
for (int j=0; j<nsubfaces; ++j) {
newCompElems[idx++] = subFaceOffset++;
}
}
// resize to actual length
newCompElems.setLength( idx );
// create comp
createComp(newMeshDat, compType, compId, newCompElems);
}
}
return MS::kSuccess;
}