GPU-based CPR is great. Does the GPU acceleration do a CPR transform specifically or it can apply any VTK grid transform?
Application of any grid transform would be really useful, because a two-way transform mapping between original and straightened space is needed for more complex use cases, that reuire showing 3D plans, devices, etc. in the straightened space; transferring annotations from the straightened space to the original space. If the exact same vtk(Oriented)GridTransform can be used by the volume renderer and by polydata transform filters then all the requirements of complex use cases can be fulfilled.