I haven't managed to get my head space into GPU. So here's some shading with CPU...
The object (here a sphere) is specified by an array of Locations and normal vectors. The angle between light direction and normal vector tells how bright a point is. Then it gets drawn.
@eljojo Thanks!
The key is to factor in the angle at which the light hits the surface since the rays per area ratio is higher if the light comes from the zenit.
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