3ds max Polygon Modeling Detailing with Editable Poly Chamfer And because of these triangles, and especially because of the very skinny triangles at the corners here, the chamfer tool is going to have some issues. If you wanted to apply a chamfer on this back corner, then you would need to manually remove all of these interior triangle edges using the remove tool. And unfortunately there's no tool in 3ds Max that's going to convert this into quadrilateral geometry.
3ds max Polygon Modeling Detailing with Editable Poly ChamferThere are a couple of modifiers such as optimize and quadify but they frankly just don't work and I don't recommend that you try to use them for this purpose. Those are more for decimating models and getting them to a lower level of detail. So, again if you wanted to apply a chamfer in the back here, you'd have to go around and manually remove all of these interior triangle edges so that all of the polygons that are being chamfered start out as quadrilaterals and then you'll have no issues. So, if we go back to the front, orbit around, we see that once again because these are all quadrilaterals, the chamfer tool worked perfectly there. That's how to use the editable poly chamfer tool.
