Function merge

src/IECoreScene/MeshAlgoMerge.cpp:245–366

};

void merge( MeshPrimitive *a, const MeshPrimitive *b, const Canceller *canceller )
{
	const auto &vertexIdsA = a->vertexIds()->readable();
	const auto &verticesPerFaceA = a->verticesPerFace()->readable();

	const auto &vertexIdsB = b->vertexIds()->readable();
	const auto &verticesPerFaceB = b->verticesPerFace()->readable();

	IntVectorDataPtr verticesPerFaceData = new IntVectorData;
	auto &verticesPerFace = verticesPerFaceData->writable();
	Canceller::check( canceller );
	verticesPerFace.resize( verticesPerFaceA.size() + verticesPerFaceB.size() );
	Canceller::check( canceller );
	auto it = std::copy( verticesPerFaceA.begin(), verticesPerFaceA.end(), verticesPerFace.begin() );
	Canceller::check( canceller );
	std::copy( verticesPerFaceB.begin(), verticesPerFaceB.end(), it );

	IntVectorDataPtr vertexIdsData = new IntVectorData;
	auto &vertexIds = vertexIdsData->writable();
	Canceller::check( canceller );
	vertexIds.resize( vertexIdsA.size() + vertexIdsB.size() );
	Canceller::check( canceller );
	it = std::copy( vertexIdsA.begin(), vertexIdsA.end(), vertexIds.begin() );
	int vertexIdOffset = a->variableSize( PrimitiveVariable::Vertex );
	auto idShift = [vertexIdOffset]( int id ){ return id + vertexIdOffset; };
	Canceller::check( canceller );
	std::transform( vertexIdsB.begin(), vertexIdsB.end(), it, idShift );

	Canceller::check( canceller );
	a->setTopologyUnchecked( verticesPerFaceData, vertexIdsData, a->variableSize( PrimitiveVariable::Vertex ) + b->variableSize( PrimitiveVariable::Vertex ), a->interpolation() );

	const auto &bCornerIds = b->cornerIds()->readable();
	if( !bCornerIds.empty() )
	{
		const auto &aCornerIds = a->cornerIds()->readable();
		IntVectorDataPtr idData = new IntVectorData;
		auto &ids = idData->writable();
		Canceller::check( canceller );
		ids.resize( aCornerIds.size() + bCornerIds.size() );
		Canceller::check( canceller );
		it = std::copy( aCornerIds.begin(), aCornerIds.end(), ids.begin() );
		Canceller::check( canceller );
		std::transform( bCornerIds.begin(), bCornerIds.end(), it, idShift );

		const auto &aSharpnesses = a->cornerSharpnesses()->readable();
		const auto &bSharpnesses = b->cornerSharpnesses()->readable();
		FloatVectorDataPtr sharpnessData = new FloatVectorData;
		auto &sharpnesses = sharpnessData->writable();
		Canceller::check( canceller );
		sharpnesses.resize( aSharpnesses.size() + bSharpnesses.size() );
		Canceller::check( canceller );
		auto fIt = std::copy( aSharpnesses.begin(), aSharpnesses.end(), sharpnesses.begin() );
		Canceller::check( canceller );
		std::copy( bSharpnesses.begin(), bSharpnesses.end(), fIt );

		a->setCorners( idData.get(), sharpnessData.get() );
	}