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For the sad weary soul a decade from now who stumbles upon this question wishing for it to be answered: void main(void){ vec3 p1 = mix(tcPosition[0], tcPosition[3], gl_TessCoord.x);//may have to rearrange these numbers depending on your implementation vec3 p2 = mix(tcPosition[1], tcPosition[2], gl_TessCoord.x); vec3 pos = normalize(mix(p1, p2, ...

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