see also Collision Tesselate : vimeo.com/61753749

Copy the script in Maxscript Startup Folder.
Steps :
0: the coordinates of the Ground object have to be X=0, Y=0, Z=0 for position rotation and X=100, Y=100, Z=100 for scale.
1: clic on GET NORMALS
2: pick the colliders you want
3: move the time line slider to deform
4: Before baking, choose the start and the End frame
5 : click on Bake Animation, it'll copy the mesh and bake the animation on the new mesh, or you also can use a point cache to bake the animation

j vimeo.com/61753750

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