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> Hi(gh)!
>
> After finally having compiled and installed PoV-Ray 3.7 for Linux, I
> still can't figure out how to tweak radiosity in a way that I get
> realistic light levels both outside and inside a building.
>
> I tried Hildur Kolbrun Andresdottir's radiosity settings from her
> tutorial (http://www.simnet.is/hildurka/content/tut1page.htm, the left
> one of the two final settings, see almost bottom of page), decreased the
> brightness value to 1 (with Mrs. Andresdottir's original 2, everything
> outside would simply drown in white), and also upped gray_threshold to
> 0.8 - but still inside, the contrast ist too low (and, compared to Mrs.
> Andresdottir's rendering, surfaces are generally too dark), while
> outside scenes are still not far from "drowning in white"!
>
> My current radiosity settings:
>
> radiosity
> {
> brightness 1.5
In most cases, this should stay at 1. Especialy when you use a large
recursion_limit like 5.
It can also be what causes your inside contrast to be to low...
> count 100
I would use a higher count and use importance to lower the sampling for
the exterior parts.
> error_bound 0.15
> gray_threshold 0.8
> low_error_factor 0.2
> minimum_reuse 0.015
> nearest_count 10
> recursion_limit 5
> adc_bailout 0.01
> max_sample 1 // -1
> always_sample 1
> pretrace_start 0.08
> pretrace_end 0.002
> }
> ambient_light 0
NOT needed with version 3.7. It's now done automaticaly whenever
radiosity is used.
>
> What did I happen to not understand?
>
> See you in Khyberspace!
>
> Yadgar
In real life, you can very easily have lighting variation of 100:1 to
10000:1 between the interior and the exterior.
Take an interior photo where you see the exterior. The exterior is often
totaly flooded with light to the point that you can't distinguish
anything but white.
In the oposite case, when you see the interior from outside, the
interior is usualy to dark to see anything, unless you have a large
window/opening relative to the interior dimentions AND the interior have
light colours or is strongly lighted.
Alain
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