PhysX Particles Simulation - Take Two

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Well, after a lot of fighting, I managed to get the volumetric render working. I'm using a 128*128*128 3D texture, and then I raymarch it in a compute shader.
The results are quite good actually. I'm getting around 140 - 170 FPS with 40.000 particles (!).
There are things to fix though. Mainly, the voxel appears to be displaced from the real center, and the rendering against the scene ( can't do Z-Buffering just like that ) leaves a lot of room for improvement.
Next things to do, fix that, add proper lighting, and then I'll pass to one idea of mine, which involves hash-maps and voxel compression...

Some screens:






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