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Particle Effect?

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I'm not sure how to explain what I'm looking for, so bear with me :) My game engine is using Cg for toon-shading, but now I've run into some problems with my particle engine. I want to be able to create big poofy smoke cloud explosions (like you would see in Looney Tunes) but can't figure out how to generate those clouds... Does anyone know where I can find a way to create this effect procedurally? Even an article offering some insightful advice would be great. Thanks!!!

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You could try using point-sprites (not sure if they exist outside of D3D tho).

I'd imagine that if you had "harsh" blending on so things where either transparent or not, then did some sort of edge filter on it (that can be done using cel shading, right?) you might get your "poofy smoke cloud"...

The bonus of using a point-sprite type particle system would be that being 3D you could rotate around and animate it and it should still look reasonable, and with a suitable large number of particles and random distribution patterns it'll probably generate as good a pattern as any procedural billboard texture you can create.

hth
Jack

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