2009

Concave Mesh The actual mesh of the object is used for simulation. Although
the convex hull of an object and the object’s actual mesh may be exactly the
same shape, using the convex hull simulates much more quickly, as reactor
can make certain assumptions for convex objects. If you try to use Concave
Mesh for a convex object you will get a warning. Not heeding such warnings
could dramatically reduce the speed of your simulation. In some cases, though,
you might want to ignore that warning. If, for example, you want to place
objects inside a convex object, and make them collide with the internal faces
of that object, you should simulate it as concave instead of convex.
NOTE If you are using a standard 3ds Max plane as a rigid body (as opposed to
the special reactor
Plane on page 3999 object), you must set its simulation geometry
to Concave Mesh.
Proxy Concave Mesh Another object’s concave mesh is used as the physical
representation of the object. For example, you can use a low-poly teapot to
animate a highly tessellated teapot. The proxy object’s pivot point is aligned
with that of the rigid body.
Rigid Body Properties | 3919