Function processInputs

src/IECoreScene/MeshAlgoDistributePoints.cpp:234–338

};

void processInputs(
	const MeshPrimitive *mesh,
	const std::string &refPosition, const std::string &uvSet, const std::string &densityMask,
	const StringAlgo::MatchPattern &primitiveVariables,
	const Canceller *canceller,
	MeshPrimitivePtr &processedMesh,
	PrimitiveVariable &uvVar, PrimitiveVariable &densityVar,
	PrimitiveVariable &faceAreaVar, PrimitiveVariable &textureAreaVar
)
{
	if( !mesh )
	{
		throw InvalidArgumentException( "MeshAlgo::distributePoints : The input mesh is not valid" );
	}

	IECoreScene::MeshPrimitivePtr meshWithUsedPrimVars = new MeshPrimitive();

	// We need the topolgy of the source mesh to triangulate it
	meshWithUsedPrimVars->setTopologyUnchecked( mesh->verticesPerFace(), mesh->vertexIds(), mesh->variableSize( PrimitiveVariable::Vertex ), mesh->interpolation() );

	// Note that we do not transfer creases or corners - they do not affect distribution of points. If we were
	// to add support for distributing onto the limit surface of a subdiv, then we might need to keep those ...
	// but that would need to happen on an untriangulated mesh anyway.

	// Transfer the subset of variables that we need
	for( auto var : mesh->variables )
	{
		if(
			var.first == uvSet || var.first == densityMask || var.first == refPosition || var.first == "P" ||
			StringAlgo::matchMultiple( var.first, primitiveVariables )
		)
		{
			meshWithUsedPrimVars->variables[ var.first ] = var.second;
		}
	}

	processedMesh = MeshAlgo::triangulate( meshWithUsedPrimVars.get(), canceller );
	if ( !processedMesh || !processedMesh->arePrimitiveVariablesValid() )
	{
		throw InvalidArgumentException( "MeshAlgo::distributePoints : The input mesh could not be triangulated" );
	}

	auto uvIt = processedMesh->variables.find( uvSet );
	if( uvIt != processedMesh->variables.end() )
	{
		PrimitiveVariable::Interpolation interp = uvIt->second.interpolation;
		if(
			uvIt->second.data->typeId() == V2fVectorDataTypeId &&
			(
				interp == PrimitiveVariable::Vertex ||
				interp == PrimitiveVariable::Varying ||
				interp == PrimitiveVariable::FaceVarying
			)
		)
		{
			uvVar = uvIt->second;
		}
	}