CODEWITHSUNDEEP
javalibgdxbox2dcollision
Luis Bermúdez
Luis Bermúdez

Reputation: 654

Use a contact listener between bodies who has filter in LibGDX box2D

I am using libGDX with box2D, and I have two bodies who has collision filtering so they cant collide each other.

I am using the groupIndex filter for those bodies, so you can imagine.

But i want to detect the body collision with the contact listener even if they cant collide to each other.

There is a way to do it?.

I did not put any code because this is a question and i thought is not necessary, at least for now...

If you can help me, thank you!.

Upvotes: 0

Views: 749

Answers (1)

icarumbas
icarumbas

Reputation: 1815

Use Contact setEnabled method.

In ContactListener:

@Override // In preSolve method. Not beginContact, it matters
public void preSolve(Contact contact, Manifold manifold) {
       short firstBit = contact.getFixtureA().getFilterData().categoryBits;
       short secondBit = contact.getFixtureB().getFilterData().categoryBits;

       if ((firstBit | secondBit) == (BOX_BIT | GROUND_BIT)) {
            System.out.println("Contact " + firstBit + " " + secondBit);
            contact.setEnabled(false);
       }
  }

These bits BOX_BIT and GROUND_BIT are bits of your bodies that shouldn't collide but ContactListener will catch contact between them, set it like: 

fixturedef.filter.categoryBits = GROUND_BIT;

Set some other bit for bodies that they should collide.

Hope helps.

Upvotes: 1

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