3ds Max :: Crop Complex 2D Meshed Objects

cropping/cutting complex meshed 2d objects.I create a 2d plane and divide it to 100x100 sections. How can I extract a star from it preserving the meshed squares of the plane?
 
In Illustrator I'd create a compound path from the 100x100 (10.000 squares)  and extract it. Then I'd create a star position it in front of the plane, select both and hit "crop" in the pathfinder.
 
What I actually need is to "subdivide" 2d shapes but if I apply the subdivide modifier It applies a triangle mesh and what i need is squares manually delete the outside segment by segment but I'm talking real complex shapes..