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Matter Tracer

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Just a combination of a few recent experiments hacked onto my Matter Collider sketch. So you can now get the 'particles' to trace the path of their motion (a bit slow); and it uses layers... in a way which you're hardly likely to notice: when you 'pick up' a particle and drag it around it's brought to the top of the layer stack - i.e. it appears above the other particles. Just wanted to see if my layer classes behaved themselves in a more complex sketch.
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