Quadratic Bezier Triangles
x(u,v,w) = u2 x200 + v2 x020 + w2 x002
+ 2uv x110 + 2vw x011 + 2wu x101
with u + v + w = 1 and 0 <= u, v, w <= 1
x is a vector with position, normal, intensity, texture co-ordinates and other attributes
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