Correction of identical vertices

Identical vertices can occur by using applications in part authoring process or by error if typing by hand. Possibilities for correction:

• Linetype 2: If vertices 1 and 2 are identical - just delete that line
• Linetype 3: If vertices 1 and 2 or 1 and 3 are identical - just delete that line
• Linetype 4: If vertices 1 and 2 identical but 3 and 4 not identical and 1 and 3 not identical - change to triangle (linetype 3). If the quad can not be transformed to a valid triangle (there are 4 possible ways!) then delete that line
• Linetype 5: If vertices 1 and 2 identical then delete that line

All other identical vertices should be inspected by human as it might be only an error in defining the vertices.

--Mikeheide 10:03, 24 June 2011 (EDT)