90 Degree Cut
Sometimes when cutting in order to add more edges and tension to
the mesh, we need to cut the mesh at 90 degrees or change the
course of the flow.
Notice in the following figure that cutting the plane to change
the direction results in a triangle in the mesh that can be avoided.
Simply cut the marked edge, as shown in the center of Figure 3-86,
and move the vertex in the direction of the new cut.
79
Chapter 3 – Polygon Subdivision
Figure 3-84
Figure 3-85
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