On 1/25/22 16:55, William F Pokorny wrote:
> Yeah, that's a thought. I didn't really think about the normal 
> components potentially canceling and going to zero. It could happen, but 
> I'd say not all that often - but maybe there is some clamping or cut 
> offs somewhere in the code that get us to zeroing.
> 
> Using aoi a good thought too! The povr aoi pattern doesn't cut off like 
> the official POV-Ray one does where the normals point away. I made this 
> change so folks can to a degree see any perturbed normal inversions - 
> they can run something to see at what bump_size they have a problem.

OK attached a 'povr aoi' image where the micro bump size is always the 
1.5 I was using for the milky looking result.

The left a z plane more or less as I expect - it's just noisy.

The middle a sphere and again just noise but because of the orthographic 
camera rays in +Z we get more inversion, more read at the edges (nearer 
tangent rays) of the sphere.

The right image is again the plane, but where the color_map is changed 
to show white pixels where they do essentially zero out. There are not 
many cases where this happens.

...So what's going on.

Bill P.

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