MEL How-To #36

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How can I ensure that a polygon face component is planar?

  1. When creating polygons, enable the Polygons -> Tool Options -> Keep New Faces Planar menu option.

  2. Create triangles, or Triangulate quads and n−gons. Triangles are planar by definition.

But of course you knew that. Here's what you were really looking for:

To "generate" planar faces from existing geometry, select one or more faces and execute the following:

global proc planarizeFacets()
  string $facets[] = `filterExpand -sm 34`;

  if ( size( $facets ) )
    polyMoveFacet -localScaleZ 0.0 $facets;

NOTE: This will not guarantee that all faces are planar! Planarizing one face will drag with it the vertices shared by adjacent faces, likely making them non-planar. Planarizing the adjacent face(s) will again drag these vertices, likely making the original face non-planar. It's a vicious circle.

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Tuesday, December 05, 2000