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How does the body definition work in Box2D?
The body definition holds the data needed to create and initialize a body. 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.
When to use forces and impulses in Box2D?
This can be handy for games where you need a teleport feature, but bear in mind that this is not realistic physics! The whole point of a physics simulator like Box2D is to make things look real, and to this end I would recommend using forces and impulses to move bodies as much as you can.
When to use b2fixturedef in Box2D?
Use b2FixtureDef if you need to set parameters like friction, restitution, user data, or filtering. If the density is non-zero, this function automatically updates the mass of the body. the shape to be cloned. the shape density (set to zero for static bodies). This function is locked during callbacks. Destroy a fixture.
What happens when a fixture is destroyed in Box2D?
Destroy a fixture. This removes the fixture from the broad-phase and destroys all contacts associated with this fixture. This will automatically adjust the mass of the body if the body is dynamic and the fixture has positive density. All fixtures attached to a body are implicitly destroyed when the body is destroyed.
How to create a body instance in Box2D?
Now, use this definition to create the actual body instance: Here, we are using the m_world member variable of the parent class Test which is a b2World object. The world object is like the boss of everything in Box2D, it handles the creation and deletion of physics objects.
What is the function getbodylist in Box2D?
The function GetBodyList () returns the first element in a linked list of bodies. When a body is destroyed like this, it takes care of deleting all the fixtures and joints attached to it. Remember not to use the deleted body pointer after this!