Box2d three point collision

[mainy]

Hello.

I am using a contact listener to work out when two fixtures collide. This is working as expected.

What I am attempting to do is flag up if three objects collide. I am unsure the best way of doing this and wanted to ask if there is already a standard approach.

Is it possible to first check if two objects collide (using the standard collision listener) and check if they are touching anything else?

Thank you

[fiftysixty]

Originally Posted by mainy

Hello.

I am using a contact listener to work out when two fixtures collide. This is working as expected.

What I am attempting to do is flag up if three objects collide. I am unsure the best way of doing this and wanted to ask if there is already a standard approach.

Is it possible to first check if two objects collide (using the standard collision listener) and check if they are touching anything else?

Thank you

Use a collision listener, and upon collision you can access the complete collision list for the bodies:

for (b2ContactEdge* ce = myBody->GetContactList(); ce; ce = ce->next) {

    b2Contact* c = ce->contact;

    // do the checks here
    b2Fixture* fixtureA = c->GetFixtureA();
    b2Body* bodyA = fixtureA->GetBody();

    // etc...
}

[mainy]

This was a great help. Thank you.

I wrote a recursive method to loop through all connected bodies.