How do I select which diagonal to use when converting quads to 2
triangles? I need to use information from 2 adjacent quads? I can't
figure it out :(  Any online suggestions?

The vertices are stored in an array
  #declare Verts = array[N][NPoints+1];

and the quads are extracted (clockwise) in nested loops
  #declare Tp1 = Verts[Count][VPt];
  #declare Tp2 = Verts[Count][VPt+1];
  #declare Tp3 = Verts[Count+1][VPt+1];
  #declare Tp4 = Verts[Count+1][VPt];

TIA

Alf

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