> It has been a long time since I used the 2-pass method, and not yet with
> 3.7, so what are the best settings nowadays? For my latest image I have
> added a media, so 2-pass render becomes necessary I guess. At this
> moment and based on much earlier code, I use this, which is certainly
> not the most efficient I guess:
>
> //start code
> radiosity {
> #if (RadSave)
> pretrace_start 0.08
> pretrace_end 0.004
> count 50, 1000
> error_bound 0.5
> always_sample on
> #else
> pretrace_start 1
> pretrace_end 1
> count 50, 100
> error_bound 1
> always_sample off
> #end //of RadSave
> brightness 1
> recursion_limit 2
> nearest_count 10, 5
> adc_bailout 0.01/2
> low_error_factor .3
> minimum_reuse 0.015
> maximum_reuse 0.1
> gray_threshold 0.0
> normal on
> media off
> //max_sample 1.0
> }
> //end code
>
> During first pass, I switch off area light and any transparent textures.
> Can I switch off the media too? I don't remember about that.
>
> Thomas

An absorbing or scattering media does cast shadows. Emissive media 
illuminate it's surounding. It's not neutral. Same thing for any fog, 
it's not neutral.
If you use non-neutral media, you NEED media on in at least the first 
pass, preferably in both.
You can remove emissive media if you never use media on.
If you turn off your media for the first pass and use it for the second 
pass, then you realy need to do some pretrace steps in your second pass, 
and need to keep the same error_bound.

Don't switch off transparent textures unless they are totaly, or close 
to be, transparent, colourless (rgbt 1 or rgbf 1) and the object don't 
have any ior.

count should be the same for both passes.

Post a reply to this message