No N-gons

• Model should not contain polygons with more that 4 edges (N-gon), only triangles and quads are acceptable.
• Smoothing issues might appear in the models which contain N-gons.
• N-gon can always be divided into quads and tris, so they are always easy to remove by adding connecting edges between the border vertices.

How to solve

• N-gons can be removed in different ways, it depends on the situation and model topology:
• Some vertexes of the N-gon could be connected with edge, so the end result will be quads and triangles instead of one N-gon.
• All or several vertexes of the N-gon could be welded together.
• Automatically:
  • turn all N-gons to quads in 3ds Max by using Turn to Poly modifier
    

• • turn all selected N-gons to triangles in blender by triangulating selected N-gon faces (Ctrl + T shortcut). How to find and select N-gons is described in the Locate N-gons infographics which is presented above.