Op 10-8-2022 om 17:42 schreef Alain Martel:
> The HDR map never emit photons.
> What you can do to get caustics from an HDR map is to use radiosity. As
> the surface receiving the caustics is close to the objects causing it,
> your radiosity settings can still be lenient. You only a small
> error_bound value.
>
> Try this as a starter :
>
> global_settings{ assumed_gamma 1
> radiosity{
> error_bound 0.1 // may try smaller
> count 150 1111
> low_error_factor 0.2
> pretrace_end 0.005
> }
> }
Excellent suggestion, concentrating on the caustics! Thanks Alain. This
is the result with:
error_bound 0.01
low_error_factor 0.1
pretrace_start 8/max(image_width,image_height)
pretrace_end 1/max(image_width,image_height)
and stochastic render:
+am3 +a0.01 +ac0.90 +r3
render time was only about 10 minutes.
--
Thomas
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