I've tried to come up with my own parametric surface description but failed. Today I've looked up and implemented Bézier triangle. No I can sample the surface I want to have. Next I will have to do create an actual geometry out of this.
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Reply from Libove Blog:
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https://blog.libove.org/posts/f78065ca-93d9-428c-b36f-6131c164d84e/
Now as surfaces. Not sure if the normals are correct yet.
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