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Hope you don't mind, Karl, I coded a version of this in vex after checking out your file. Slightly different than yours, but using the same principle. I put two options in there, one to do even divisions between particles, and another to use a step size for divisions, so you always get a somewhat even distribution of new points. Match this to your flip particle step size, and I think that will provide optimized results. I also approximate normals on the point cloud and provide a random spread along the surface tangents which can further help fill in the gaps. There's an option in there to try and detect isolated particles and delte them, but that will slow things down a lot. HIP and OTL attached. splashExample.hip pc_gapfiller.hda