3ds Max - Delete Mesh Modifier
Modifier : Delete Mesh
Works on: Mesh, Poly - All sub objects
3ds Max Description : Delete Mesh provides parametric deletion based on the current sub-object selection level in the stack. The possible choices are faces, vertices, edges, and objects. Apply the Delete Mesh modifier to delete the geometry specified at that sub-object level.
My 2 Cents : The Delete Mesh modifier works well for removing geometry without having to delete. I often use the delete mesh modifier in conjunction with the Edit Poly Modifier or Mesh Select Modifier. Typical examples might be removing faces to place windows or openings in a building skin surfaces. Essentially, the delete mesh allows for non destructive topological changes in geometry. That is not to say once you go back up your modifier stack your geometry will be fine, I’m just saying you have the ability to change deleted faces and see the affect on the resultant geometry. If the geometry is deleted this become a bit more difficult.
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what is that tool on top-right of the viewport of max? the box……
thats a new viewport tool in 3ds Max 2009