On 24/02/2018 03:08, Alain wrote:
> For plain, transparent surfaces, where there is no refection nor 
> refraction, then, trace_level don't increase. I did not check with irid. 
> Don't mather if it's filter or transmit, and the actual colour don't 
> mather.
> In all other cases, trace_level increase by 1 each times the ray 
> encounter the surface.
> 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.
> 
> Another way to controll run away rays is to change adc_bailout to a 
> slightly larger value than the default. Keep that increase small. Be 
> carefull with that one as, in some cases, it may cause some unwanted 
> defects.

Food for thought. Thanks Alain


-- 

Regards
     Stephen

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