Nearest Neighbor Search
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Allows to query and get a list of neighboring particles from a given particle. This could be used to create advanced simulations like fluids or boids (flock of birds or fish).
In the meantime, such system requires coding, either using the GraphicsBuffer support in 21.2 to perform a simulation in an independent (or several) compute shader(s) and bind the end result(s) to a VFX, or rendering the system offscreen to write down some data to a texture (like some cumulated velocities for instance) and then read it in the update.