On 2/19/26 07:05, Bald Eagle wrote:
> Any ideas?

Guesses.

Some of what I see in your image can happen when the plane of the camera 
slices into shapes like the torus{}.

That 'emission 1' didn't help much and that you have some apparent 
speckling looks more like solver issues - which could be related to 
geometry of the scene for the image posted and/or the state of the 
'solver code' itself.

Are you using an orthographic camera?

With the camera set up you have, how are you zooming?

Have you tried with both 'sturm' and not? If so, are there differences 
in result?

A wilder guess. The ray->surface intersection equations for the torus 
adjust each rays origin prior to creating the equation for the 
solver(s). The origin adjustments are unrolled after roots are found so 
as to get the real intersection positions. It's known that ray origin 
adjustment works less well at larger torus dimensions once the equation 
origin is beyond the first surface.

Bill P.

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