Algodoo

I've looked at a lot of Algodoo scenes that attempt to simulate smoke, and although a few come close to being realistic looking, they still lack the cloudy, difuse texture that real smoke has. I found an intrinsic function called app.tracerfuzziness that you can adjust to make your tracer traces look fuzzy instead of having hard or sharp edges. I also use a random number generator to make the hinges shake wildly instead of simply rotate, which helps to randomly spit out the fuzzy traces. The resut is a more realistic smoke trail. And there are a LOT of them!

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