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Smoke simulation
https://gfycat.com/ForsakenAnimatedEasternnewt
After seeing this thread about having multiple moving particle emitters, I decided to write a quick script. That turned into this sketch where I came up with a unique particle collision system and then my own smoke renderer. The first iteration I got about .5fps, so I figured out my own boxel shading method. You can change the number of samples/boxel size on the fly with one variable and the effect is quite flexible.