Function deleteCreases

src/IECoreScene/MeshAlgoDeleteFaces.cpp:86–149

};

void deleteCreases( MeshPrimitive *out, const MeshPrimitive *in, const std::vector<int> &remapping, const Canceller *canceller )
{
	const auto &lengths = in->creaseLengths()->readable();
	if( lengths.empty() )
	{
		return;
	}

	const auto &ids = in->creaseIds()->readable();
	const auto &sharpnesses = in->creaseSharpnesses()->readable();

	IntVectorDataPtr outLengthData = new IntVectorData;
	auto &outLengths = outLengthData->writable();

	IntVectorDataPtr outIdData = new IntVectorData;
	auto &outIds = outIdData->writable();

	FloatVectorDataPtr outSharpnessData = new FloatVectorData;
	auto &outSharpnesses = outSharpnessData->writable();

	int creaseIdOffset = 0;
	for( size_t i = 0; i < lengths.size(); ++i )
	{
		if( i % 1000 == 0 )
		{
			Canceller::check( canceller );
		}

		int j = 0;
		while( j < lengths[i] )
		{
			// Skip non included verts
			while( j < lengths[i] && remapping[ ids[ creaseIdOffset + j ] ] == -1 )
			{
				j++;
			}
			int startCrease = j;

			// Scan until we reach the end, or a vert that isn't included.
			// If there in a non-included vert in the middle of a crease of length 5 or more,
			// we may need to output more than one crease per input crease.
			while( j < lengths[i] && remapping[ ids[ creaseIdOffset + j ] ] != -1 )
			{
				j++;
			}

			// We've either reached the end, or a non-included vert - output a crease
			if( j - startCrease >= 2 )
			{
				for( int k = startCrease; k < j; k++ )
				{
					// \todo - a little wasteful here, should be caching these lookups in the remapping map
					outIds.push_back( remapping[ ids[ creaseIdOffset + k ] ] );
				}
				outLengths.push_back( j - startCrease );
				outSharpnesses.push_back( sharpnesses[i] );
			}
		}