clicking on a sphere

Question

I have a unit sphere (radius 1) that is drawn centred in orthogonal projection.

The sphere may rotate freely.

How can I determine the point on the sphere tha

Answer 1

One possible approach is to generate the sphere from triangles, consisting of rows and columns. They can be invisible too. And then hit-testing those triangles with a mouse pick ray.

See this picture's latitude/longitude grid, but apply it much denser. For each grid cell, you need 2 triangles.