OpenGL 4 Shading Language Cookbook - Third Edition

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One of the problems with the preceding technique is that feathering can occur due to the gaps between consecutive edge quads:

The preceding diagram shows the feathering of a silhouette edge. The gaps between the polygons can be filled with triangles, but in our example, we simply extend the length of each quad to fill in the gap. This can, of course, cause artifacts if the quads are extended too far, but in practice they haven't been very distracting in my experience.

A second issue is related to depth testing. If an edge polygon extends into another area of the mesh, it can be clipped due to the depth test. The following is ...