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10.1.4 Phong Shading by Adaptive Tessellation

Phong highlights can also be approached with a modeling technique. The surface can be adaptively tessellated until the difference between $(\vec{H} \cdot \vec{N})^n$ terms on triangle vertices drops below a predetermined value. The advantage of this technique is that it can be done as a separate pre-processing step. The disadvantage is that it increases the complexity of the modeled object. This can be costly if: