Hello,

I found something interesting:

If I set

r1 = 1
r2 = 2

the scene renders without error, if I change the pigment to "rgbt 1" to "rgbt
0.9". I checked some values between 0.9 and 1: "rgbt 0.99" again makes the
error.

This effect is independent from the max_trace_level.

!! However: If I set a global_settings' adc_bailout to 0.2 no error occurs !!

In conclusion (always r1 = 1; r2 = 2; max_trace_level=256):

"rgbt 1" in combination with "adc_bailout 1/256" gives an error

"rgbt 0.99" in combination with "adc_bailout 1/256" gives an error

"rgbt 0.9" in combination with "adc_bailout 1/256" works

"rgbt 0.99" in combination with "adc_bailout 0.1" works

Any idea?

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