CpuSmoothNormalContext::CpuSmoothNormalContext(
Far::TopologyRefiner const & refiner, int level, bool resetMemory) :
_numVertices(0), _resetMemory(resetMemory) {
int nfaces = refiner.GetNumFaces(level),
nverts = nfaces * 4;
_faceVerts.resize(nverts);
Far::Index * dest = &_faceVerts[0];
for (int face=0; face<nfaces; ++face, dest+=4) {
Far::ConstIndexArray fverts = refiner.GetFaceVertices(level, face);
memcpy(dest, fverts.begin(), 4 * sizeof(Far::Index));
}
}
//------------------------------------------------------------------------------
int main(int, char **) {
int maxlevel = 3;
typedef Far::TopologyRefinerFactoryBase::TopologyDescriptor Descriptor;
Sdc::SchemeType type = OpenSubdiv::Sdc::SCHEME_CATMARK;
Sdc::Options options;
options.SetVtxBoundaryInterpolation(Sdc::Options::VTX_BOUNDARY_EDGE_ONLY);
options.SetFVarLinearInterpolation(Sdc::Options::FVAR_LINEAR_NONE);
// Populate a topology descriptor with our raw data
Descriptor desc;
desc.numVertices = g_nverts;
desc.numFaces = g_nfaces;
desc.numVertsPerFace = g_vertsperface;
desc.vertIndicesPerFace = g_vertIndices;
// Create a face-varying channel descriptor
Descriptor::FVarChannel uvs;
uvs.numValues = g_nuvs;
uvs.valueIndices = g_uvIndices;
// Add the channel topology to the main descriptor
desc.numFVarChannels = 1;
desc.fvarChannels = & uvs;
// Instantiate a FarTopologyRefiner from the descriptor
Far::TopologyRefiner * refiner =
Far::TopologyRefinerFactory<Descriptor>::Create(desc,
Far::TopologyRefinerFactory<Descriptor>::Options(type, options));
// Uniformly refine the topolgy up to 'maxlevel'
// note: fullTopologyInLastLevel must be true to work with face-varying data
{
Far::TopologyRefiner::UniformOptions options(maxlevel);
options.fullTopologyInLastLevel = true;
refiner->RefineUniform(options);
}
// Allocate & interpolate the 'vertex' primvar data (see tutorial 2 for
// more details).
std::vector<Vertex> vbuffer(refiner->GetNumVerticesTotal());
Vertex * verts = &vbuffer[0];
int nCoarseVerts = g_nverts;
for (int i=0; i<nCoarseVerts; ++i) {
verts[i].SetPosition(g_verts[i][0], g_verts[i][1], g_verts[i][2]);
}
refiner->Interpolate(verts, verts + nCoarseVerts);
// Allocate & interpolate the 'face-varying' primvar data
int channel = 0,
nCoarseFVVerts = refiner->GetNumFVarValues(0, channel);
std::vector<FVarVertex> fvBuffer(refiner->GetNumFVarValuesTotal(channel));
FVarVertex * fvVerts = &fvBuffer[0];
for (int i=0; i<g_nuvs; ++i) {
fvVerts[i].u = g_uvs[i][0];
fvVerts[i].v = g_uvs[i][1];
}
refiner->InterpolateFaceVarying(fvVerts, fvVerts + nCoarseFVVerts, channel);
{ // Output OBJ of the highest level refined -----------
// Print vertex positions
for (int level=0, firstVert=0; level<=maxlevel; ++level) {
if (level==maxlevel) {
for (int vert=0; vert<refiner->GetNumVertices(level); ++vert) {
float const * pos = verts[firstVert+vert].GetPosition();
printf("v %f %f %f\n", pos[0], pos[1], pos[2]);
}
} else {
firstVert += refiner->GetNumVertices(level);
}
}
// Print uvs
for (int level=0, firstVert=0; level<=maxlevel; ++level) {
if (level==maxlevel) {
for (int vert=0; vert<refiner->GetNumFVarValues(level, channel); ++vert) {
FVarVertex const & uv = fvVerts[firstVert+vert];
printf("vt %f %f\n", uv.u, uv.v);
}
} else {
firstVert += refiner->GetNumFVarValues(level, channel);
}
}
// Print faces
for (int face=0; face<refiner->GetNumFaces(maxlevel); ++face) {
Far::ConstIndexArray fverts = refiner->GetFaceVertices(maxlevel, face),
fvverts = refiner->GetFVarFaceValues(maxlevel, face, channel);
// all refined Catmark faces should be quads
assert(fverts.size()==4 and fvverts.size()==4);
printf("f ");
for (int vert=0; vert<fverts.size(); ++vert) {
// OBJ uses 1-based arrays...
printf("%d/%d ", fverts[vert]+1, fvverts[vert]+1);
}
printf("\n");
}
}
}