I was wondering what efficient techniques are out there for mapping collision filtering between various bodies, sub-bodies, and so forth.
I'm working on a physics engine and I need ways for a user to easily specify some complex relationships between bodies (what should/shouldn't collide), and ways to organize that filtering data so that it's easily attainable / memory-efficient. One part of my engine that could also be taken advantage is what my 'bodies' actually are. They're like folders that you can put convex shapes, and other bodies in as to organize the parts of a complex rigid body.
I'm familiar with the simple idea of having different layers of 2D bodies, but this is not sufficient for more complex mapping:
(Think of having sub-bodies of a body, such as limbs, collide with each other by placing them on the same layer, and then wanting to only have the limbs collide with the ground but not the body)
- I don't see how a user could accomplish the above example with just a bunch of different layers... The body must collide with the ground and therefore be in the same layer, but the limbs must also be in the same layer as the ground, causing unwanted collision between the body and the limbs.
This can be solved with a multidimensional layer setup, but I would probably end up just creating more and more layers to the point where the simplicity and efficiency of layer filtering would be gone.
Are there any more complex filtering techniques that would solve complex situations such as the example? And even more possibly complex situations?