news:web.44210cddb0f87641598059850@news.povray.org...
> but i also tried others' idea for changing the max_trace_level to be 20,
and
> the result appears excellent, though the render speed is slow, and am
going
> to seek for appropriate values for the max_trace_level and min reflection.


In addition to max_trace_level, you could want to tweak adc_bailout, I
suggest you have a look at the doc on this topic
I quote
"The point at which a ray's contribution is considered insignificant is
controlled by the adc_bailout value. The default is 1/255 or approximately
0.0039 since a change smaller than that could not be visible in a 24 bit
image. Generally this setting is perfectly adequate and should be left
alone. Setting adc_bailout to 0 will disable ADC, relying completely on
max_trace_level to set an upper limit on the number of rays spawned."

you could rise  adc_bailout to get shorter render times

Marc

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