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2

The normals were indeed wrong. Which was crazy, because I had even checked in Blender that they were correct (and they were). Turns out, when loading the mesh, I was passing the normal as color and vice versa. Valletin's normal visualization shader was great (https://vallentin.dev/2015/02/16/visualizing-normals). Thanks for your help!


-1

Yes, if we think further term. Right now OpengL is still top but Vulkan will soon replace.


0

Build a hexahedron from 6 triangles(!), setting its 2 vertices at the poles of the sphere, and the other 3 vertices equally around the equator. Then iteratively or recursively subdivide all triangles, projecting the new vertices at the sphere surface (!). Triangle subdivision can be done by replacing an original triangle by 4 new ones, adding new vertices in ...


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