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What is a collision group, and how does it differ from a regular group?


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According to the documentation, "A Group is a container for display objects including Sprites and Images." I haven't been able to find a definition for collision groups, but it seems they're part of the P2 physics engine; somehow they control what an object can collide with. The canonical example for collision groups uses both. A regular group has all sorts of properties; a collision group only has one property called "mask".

What is a collision group? What is it for? What happens to a sprite when it gets added to a collision group?

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