// Build default indices array.
void ModelRenderer::BuildIndices(
const CModelDefPtr& mdef,
const VertexArrayIterator<u16>& Indices)
{
size_t idxidx = 0;
SModelFace* faces = mdef->GetFaces();
for (size_t j = 0; j < mdef->GetNumFaces(); ++j) {
SModelFace& face=faces[j];
Indices[idxidx++]=face.m_Verts[0];
Indices[idxidx++]=face.m_Verts[1];
Indices[idxidx++]=face.m_Verts[2];
}
}
float PSModel::BackToFrontIndexSort(const CMatrix3D& worldToCam)
{
static std::vector<IntFloatPair> IndexSorter;
CModelDefPtr mdef = m_Model->GetModelDef();
size_t numFaces = mdef->GetNumFaces();
const SModelFace* faces = mdef->GetFaces();
if (IndexSorter.size() < numFaces)
IndexSorter.resize(numFaces);
VertexArrayIterator<CVector3D> Position = m_Position.GetIterator<CVector3D>();
CVector3D tmpvtx;
for(size_t i = 0; i < numFaces; ++i)
{
tmpvtx = Position[faces[i].m_Verts[0]];
tmpvtx += Position[faces[i].m_Verts[1]];
tmpvtx += Position[faces[i].m_Verts[2]];
tmpvtx *= 1.0f/3.0f;
tmpvtx = worldToCam.Transform(tmpvtx);
float distsqrd = SQR(tmpvtx.X)+SQR(tmpvtx.Y)+SQR(tmpvtx.Z);
IndexSorter[i].first = (int)i;
IndexSorter[i].second = distsqrd;
}
std::sort(IndexSorter.begin(),IndexSorter.begin()+numFaces,SortFacesByDist());
// now build index list
size_t idxidx = 0;
for (size_t i = 0; i < numFaces; ++i) {
const SModelFace& face = faces[IndexSorter[i].first];
m_Indices[idxidx++] = (u16)(face.m_Verts[0]);
m_Indices[idxidx++] = (u16)(face.m_Verts[1]);
m_Indices[idxidx++] = (u16)(face.m_Verts[2]);
}
return IndexSorter[0].second;
}
