ObjectPtr FromHoudiniPolygonsConverter::doDetailConversion( const GU_Detail *geo, const CompoundObject *operands ) const
{
const GA_PrimitiveList &primitives = geo->getPrimitiveList();
MeshPrimitivePtr result = new MeshPrimitive();
size_t numEdges = 0;
std::vector<int> vertIds;
std::vector<int> vertsPerFace;
GA_Offset start, end;
for( GA_Iterator it( geo->getPrimitiveRange() ); it.blockAdvance( start, end ); )
{
for( GA_Offset offset = start; offset < end; ++offset )
{
const GA_Primitive *prim = primitives.get( offset );
if( prim->getTypeId() != GEO_PRIMPOLY )
{
throw std::runtime_error( "FromHoudiniPolygonsConverter: Geometry contains non-polygon primitives" );
}
size_t numPrimVerts = prim->getVertexCount();
vertsPerFace.push_back( numPrimVerts );
numEdges += numPrimVerts;
std::vector<int> ids( numPrimVerts );
for( size_t j = 0; j < numPrimVerts; j++ )
{
vertIds.push_back( geo->pointIndex( prim->getPointOffset( numPrimVerts - 1 - j ) ) );
}
}
}
result->setTopology( new IntVectorData( vertsPerFace ), new IntVectorData( vertIds ) );
CompoundObjectPtr modifiedOperands = transferMeshInterpolation( geo, operands, result.get() );
if( geo->getNumVertices() )
{
transferAttribs( geo, result.get(), modifiedOperands ? modifiedOperands.get() : operands );
}
// check for corners and creases, which would have been extracted via transferAttribs()
// as they are no different to standard attribs in Houdini.
convertCorners( result.get() );
convertCreases( result.get(), vertIds, numEdges );
return result;
}
PrimitivePtr FromHoudiniPolygonsConverter::doPrimitiveConversion( const GU_Detail *geo, const CompoundObject *operands ) const
{
const GA_PrimitiveList &primitives = geo->getPrimitiveList();
MeshPrimitivePtr result = new MeshPrimitive();
GA_Iterator firstPrim = geo->getPrimitiveRange().begin();
for ( GA_Iterator it=firstPrim; !it.atEnd(); ++it )
{
const GA_Primitive *prim = primitives.get( it.getOffset() );
if ( prim->getTypeId() != GEO_PRIMPOLY )
{
throw std::runtime_error( "FromHoudiniPolygonsConverter: Geometry contains non-polygon primitives" );
}
}
// loop over primitives gathering mesh data
std::vector<int> vertIds;
std::vector<int> vertsPerFace;
for ( GA_Iterator it=firstPrim; !it.atEnd(); ++it )
{
const GA_Primitive *prim = primitives.get( it.getOffset() );
size_t numPrimVerts = prim->getVertexCount();
vertsPerFace.push_back( numPrimVerts );
std::vector<int> ids( numPrimVerts );
for ( size_t j=0; j < numPrimVerts; j++ )
{
vertIds.push_back( geo->pointIndex( prim->getPointOffset( numPrimVerts - 1 - j ) ) );
}
}
result->setTopology( new IntVectorData( vertsPerFace ), new IntVectorData( vertIds ) );
if ( geo->getNumVertices() )
{
transferAttribs( geo, result, operands );
}
return result;
}
ObjectPtr BINMeshReader::doOperation( const CompoundObject *operands )
{
const std::string &fileName = m_fileNameParameter->getTypedValue();
ifstream f( fileName.c_str() );
f.seekg( 0, ios_base::beg );
uint32_t magic = 0;
readLittleEndian( f, magic );
uint32_t version = 0;
readLittleEndian( f, version );
if ( version <= 3 )
{
throw IOException(( boost::format( "BINMeshReader: '%s' is of an unsupported version" ) % fileName ).str() );
}
MeshPrimitivePtr mesh = new MeshPrimitive();
uint32_t numVertices = 0;
bool foundGeometryChunk = false;
bool done = false;
uint32_t chunkId = 0;
while ( !done && !f.fail() )
{
readLittleEndian( f, chunkId );
if ( f.fail() )
{
throw IOException(( boost::format( "BINMeshReader: Error encountered while reading '%s'" ) % fileName ).str() );
}
if ( chunkId == 0xDEDEDEDE ) /// EOF marker
{
if ( !foundGeometryChunk )
{
throw IOException(( boost::format( "BINMeshReader: No geometry chunk encountered while reading '%s'" ) % fileName ).str() );
}
done = true;
}
else if ( chunkId == 0xCCCCCCCC ) /// geometry chunk
{
if ( foundGeometryChunk )
{
throw IOException(( boost::format( "BINMeshReader: Duplicate geometry chunk encountered while reading '%s'" ) % fileName ).str() );
}
foundGeometryChunk = true;
V3fVectorDataPtr pData = new V3fVectorData();
readLittleEndian( f, numVertices );
pData->writable().resize( numVertices );
for ( uint32_t i = 0; i < numVertices; i ++ )
{
V3f p;
readLittleEndian( f, p.x );
readLittleEndian( f, p.y );
readLittleEndian( f, p.z );
pData->writable()[i] = p;
}
uint32_t numFaces = 0;
readLittleEndian( f, numFaces );
IntVectorDataPtr vertsPerFaceData = new IntVectorData();
/// All faces are triangles
vertsPerFaceData->writable().resize( numFaces, 3 );
IntVectorDataPtr vertIdsData = new IntVectorData();
vertIdsData->writable().reserve( numFaces * 3 );
for ( uint32_t i = 0; i < numFaces; i ++ )
{
uint32_t v0 = 0, v1 = 0, v2 = 0;
readLittleEndian( f, v0 );
readLittleEndian( f, v1 );
readLittleEndian( f, v2 );
vertIdsData->writable().push_back( v0 );
vertIdsData->writable().push_back( v1 );
vertIdsData->writable().push_back( v2 );
}
mesh->variables[ "P" ] = PrimitiveVariable( PrimitiveVariable::Vertex, pData );
mesh->setTopology( vertsPerFaceData, vertIdsData, "linear" );
}
else if ( chunkId == 0xCCCCCC00 ) /// texture chunk
{
if ( !foundGeometryChunk )
{
throw IOException(( boost::format( "BINMeshReader: No geometry chunk encountered while reading '%s'" ) % fileName ).str() );
}
uint32_t numFluids = 0;
readLittleEndian( f, numFluids );
V3fVectorDataPtr uvwData = new V3fVectorData();
uvwData->writable().resize( numVertices );
for ( uint32_t v = 0; v < numVertices; v ++ )
{
for ( uint32_t fl = 0; fl < numFluids - 1; fl ++ )
{
/// Just skip over there for now
/// \todo Work out what to do with them
float textureWeight = 0.0f;
readLittleEndian( f, textureWeight );
}
V3f uvw;
readLittleEndian( f, uvw.x );
readLittleEndian( f, uvw.y );
readLittleEndian( f, uvw.z );
uvwData->writable()[v] = uvw;
}
mesh->variables[ "uvw" ] = PrimitiveVariable( PrimitiveVariable::Vertex, uvwData );
}
else if ( chunkId == 0xCCCCCC11 ) /// velocity chunk
{
if ( !foundGeometryChunk )
{
throw IOException(( boost::format( "BINMeshReader: No geometry chunk encountered while reading '%s'" ) % fileName ).str() );
}
V3fVectorDataPtr velocityData = new V3fVectorData();
velocityData->writable().resize( numVertices );
for ( uint32_t i = 0; i < numVertices; i ++ )
{
V3f vel;
readLittleEndian( f, vel.x );
readLittleEndian( f, vel.y );
readLittleEndian( f, vel.z );
velocityData->writable()[i] = vel;
}
mesh->variables[ "velocity" ] = PrimitiveVariable( PrimitiveVariable::Vertex, velocityData );
}
else
{
throw IOException(( boost::format( "BINMeshReader: Invalid chunk encountered while reading '%s'" ) % fileName ).str() );
}
}
if ( chunkId != 0xDEDEDEDE )
{
throw IOException(( boost::format( "BINMeshReader: No end of file chunk encountered while reading '%s'" ) % fileName ).str() );
}
assert( mesh );
return mesh;
}
