[Question] Only one object affected by collision about matter-js HOT 4 CLOSED

It's currently possible to set the groupId value on a body. It's a number that indicates if two bodies should be considered 'as-one' and therefore do not collide.

E.g. bodyA.groupId = 1 and bodyB.groupId = 1 means that those bodies will not collide with each other. You can get new groupIds like so bodyA.groupId = Body.nextGroupId();.

This may help you achieve what you need, although it could be too limited depending on requirements.

I actually have plans to implement a far more granular way to define categories for collision, but no implementation yet.

If you need something now, you could try patching Matter.Detector.collisions see these lines for where you can test and reject collisions based on your own needs.

from matter-js.

Oh okay, I'll have to modify the engine. Thank you ^_^

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Can a body belong to multiple groups?

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Not at the moment, but you should be able to replace the function:
Matter.Detector.canCollide = (filterA, filterB) => { ... } with your own function that does anything you need.

Collision filters are definitely something I'd like to improve though, check out #341.

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