public SourceChannel(Component_RenderingPipeline.RenderSceneData.MeshDataRenderOperation sourceOper, VertexElementSemantic semantic, VertexElementType type)
: this()
{
if (sourceOper.VertexStructure.GetElementBySemantic(semantic, out sourceElement) && sourceElement.Type == type)
{
sourceBuffer = sourceOper.VertexBuffers[sourceElement.Source];
SourceData = sourceBuffer.ExtractChannel <TBuffer>(sourceElement.Offset);
Exists = true;
}
}