Cap Holes is a great modifier for modeling as well as making images in 3ds Max. The 3D Studio Max Cap Holes modifier builds faces in the holes in a mesh object. A hole is defined as a loop of edges, each of which has only one face. For example, one or more missing faces from a sphere would produce one or more holes. The modifier works best on reconstructing planar holes, but can do a reasonable job on non-planar holes as well. See how to use it in conjunction with a slice modifier, it's a good way to do section perspective renderings or drawings. One of the great features is once you apply an edit poly modifier on top of it the capped faces are automatically selected. Another way to so this operation is to use the Cap command with the border sub-object of an editable poly. If you are new to 3ds Max, this tutorial will help build your modeling repertoire by teaching you how to use the cap holes modifier.