This is used to compute the current state of a contact manifold.
Creates a new b2WorldManifold.
World vector pointing from A to B.
World contact point (point of intersection).
Evaluate the manifold with supplied transforms. This assumes modest motion from the original state. This does not change the point count, impulses, etc. The radii must come from the shapes that generated the manifold.
Manifold to evaluate.
A transform.
A radius.
B transform.
B radius.