What can joints be used for in Box2D?
Box2D has a number of ‘joints’ that can be used to connect two bodies together. These joints can be used to simulate interaction between objects to form hinges, pistons, ropes, wheels, pulleys, vehicles, chains, etc. Learning to use joints effectively helps to create a more engaging and interesting scene.
Why do you need earplugs for Box2D explosions?
By now your brain is probably so full of Box2D info that you have to wear earplugs to keep it from falling out anyway. Simulating an explosion comes down to finding out what bodies are in the vicinity of the blast and applying an impulse to push them away from the blast location.
Which is the parent of all the classes in Box2D?
The class b2Joint is the parent of all the classes mentioned above, but it is an abstract class which is never used directly. So when creating joints, although the function CreateJoint does return a b2Joint* type as expected, this is really a pointer to an instance of one of the classes above.
How does a rigid body work in Box2D?
Bodies are always rigid bodies in Box2D. That means that two fixtures attached to the same rigid body never move relative to each other and fixtures attached to the same body don’t collide. Fixtures have collision geometry and density. Normally, bodies acquire their mass properties from the fixtures.
How does Box2D copy data out of the body definition?
Box2D copies the data out of the body definition; it does not keep a pointer to the body definition. This means you can recycle a body definition to create multiple bodies. Let’s go over some of the key members of the body definition.
Which is the most complex part of Box2D?
The Dynamics module is the most complex part of Box2D and is the part you likely interact with the most. The Dynamics module sits on top of the Common and Collision modules, so you should be somewhat familiar with those by now. The Dynamics module contains: fixture class rigid body class contact class joint classes world class listener classes