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Instance Noodles: GetSlice (Buffer) only moving Particles

Hey guys,
I’m trying to GetSlice only the positions of moving particles out of a Pos3dBuffer. Or as an alternative it could also come handy for me to GetSlice all positions out of an Pos3dBuffer, which are in a certain area. Do you have any ideas how this could work without expensive readbacks?

You simply cannot avoid a readback if you want to pull data from the gpu back to cpu. maybe you can do some processing in a compute shader and only readback the most essential stuff?