Evaluating Tessellation Coordinates for the Teapot
Bézier patches use a bit of mathematics to determine the final vertex position from the input control points. The equation mapping a tessellation coordinate to a vertex position for our 4 × 4 patch is:
with 
being the final vertex position, 
the input control point at index (i, j) in our input patch (both of which are vec4s in GLSL), and B which are two scaling functions.
While it might not seem ...
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