forked from bartvdbraak/blender
60ce95f562
* The old collisions code detected particle collisions by calculating the collision times analytically from the collision mesh faces. This was pretty accurate, but didn't support rotating/deforming faces at all, as the equations for these quickly become quite nasty. * The new code uses a simple "distance to plane/edge/vert" function and iterates this with the Newton-Rhapson method to find the closest particle distance during a simulation step. * The advantage in this is that the collision object can now move, rotate, scale or even deform freely and collisions are still detected reliably. * For some extreme movements the calculation errors could stack up so much that the detection fails, but this can be easily fixed by increasing the particle size or simulation substeps. * As a side note the algorithm doesn't really do point particles anymore, but uses a very small radius as the particle size when "size deflect" isn't selected. * I've also updated the collision response code a bit, so now the particles shouldn't leak even from tight corners. All in all the collisions code is now much cleaner and more robust than before! |
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