- The alternative draw functions accept a cache identifier and vtkDataArray instances instead of raw pointers.
- The graphics implementation will associate the vtkDataArray(s) with the cache identifier, so that any pre-existing graphics objects can be retrieved during subsequent frames if the vtkDataArray(s) have not changed.
- This API is available only for DrawPoints, DrawMarkers, DrawPointSprites and DrawTriangleMesh.
- The other Draw functions cannot use caching because new primitives are generated in temporary C++ vectors just before the draw call.
- Add timer events around glDrawArrays