On 02/23/2018 10:08 PM, Alain wrote:
> Le 18-02-23 à 14:00, William F Pokorny a écrit :
...
> So, interior{ior 1.000000001} will force the trace count to increase.
> So will reflection{e-12}.
> Also, I found that, apparently, adding any colour fading into the 
> interior or some media to the object will also cause the trace count to 
> increase.
> 
> 
Thanks! Three good ideas I'd not tried when getting stuck with run-away 
rays.

I'll add another that once worked for me - ever so slightly changing the 
camera position.

Aside: The camera change idea has a variant I've used not with run-away 
rays, but rather with solver artifacts. It works with occasional success 
and better on lower resolution images. Namely, rendering with an odd 
number of pixels in the direction perpendicular to an artifact 
directionally aligned with a row or column of pixels. You can sometimes 
move rays so the artifact / solver issue is 'hiding' between pixel rows 
or columns.

Bill P.

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