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point sprites usage?

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is it more effficient to use lots of small point sprites or fewer but bigger ones. i want to make trails of dust from cars skidding. i know how to control the location of it, and give it some randomness of movement, but can i set things like the scale of the sprite, the opacity, and the color? or maybe even a tiny texture(8x8 or so)? also, are they automatically blilboarded with teh camera? that would save a LOT of calculations with lots of little dust sprites from the cars.

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yes you can, try checking out these states


as for the opacity,well, you can change the diffuse color,

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