Make Gaussian Resampling work in parallel
There needs to be a way to convert a mesh-less structure (e.g. point cloud, particles, SPH data) into a sample 3D image that can be, among other things, volume rendered. One effective technique is to splat the points into a grid. Right now there is no good way to do that in parallel. The Gaussian Resampling filter or something equivalent to it needs to be updated to work correctly in MPI.