|shapeIdx||The index of the physics shape to retrieve.|
|physicsShape||An ordered list of the points in the selected physics shape to store points in.|
int The number of points stored in the given list.
Gets a physics shape from the Sprite by its index.
A physics shape is a cyclic sequence of line segments between points that define the outline of the Sprite used for physics. Since the Sprite can have holes and discontinuous parts, its outline is not necessarily defined by a single physics shape.