I have implemented a simple 3D point cloud visualization control intended to test whether WPF 3D can be reasonably used as a point cloud viewer. Up to this point, I have been rendering clouds using TIN geometry because WPF only supports meshes.
Using indexed meshes, I generated geometry that could represent points in 3D space. At first, I tried to make the points visible from all angles, but that required too much memory from the 3D viewer even for simple clouds. I reduced the memory footprint by only generating geometry for the top face of the pseudo-points, which allowed small clouds to be rendered. For large clouds, I had to thin down to fewer than 1m points before generating geometry. Even at this point, I was forced to make the point geometry larger than desired in order for it to not disappear when rendered.