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Rigid Body Properties 721
Proxy Convex Hull—The convex hull of another
object is used as the physical representation of the
object in the simulation. For instance, you could
use the convex hull of a low-poly teapot to simulate
a high-poly teapot. The proxy object’s pivot point
is aligned with that of the rigid body.
Concave M esh—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
sim ulates much more quickly, as reactor can make
certain assumptions for conv ex 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 aconvexobject,andmakethem
collide with the internal faces of that objec t, you
should simulate it as concave instead of convex.
Note: If you are using a standard 3ds Max plane as a
rigidbody(asopposedtothespecialreactorPlane
(page 2–764) object), you must set its simulation
geometry to Concave Mesh.
Prox y Concave M esh—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.
Not Sha red—This option is active only when
multiple objects with different Simulation
Geometry sett ings are selected, and can not be
chosen by the user.