|
![](/i/fill.gif) |
Kari Kivisalo wrote:
>There is but it's not sqrt(area), it's sqrt(sqrt(area)) or sqrt(diameter)
>in case of square source.
> fade_distance is the only way to specify the physical dimension of the
> source for intensity calculations.
I insist: for which light color? Because it all depends on the color you
give to the light_source.When I read the definition of fade_distance from
the POV manual, I deduce it can be done equally with the color. Then, take
for example your cornell box scene, and change these light source values:
color LightColor*7
fade_distance (DX+DZ)/2
with these other:
color LightColor*7*pow((DX+DZ)/2,2)
fade_distance 1
and you will see they give the same scene! So, what this means?
> http://www.pp.htv.fi/kkivisal/relative_error.gif
Sorry, I'm not that mathematically minded: I do not see what the graphic
is suposed to show... :( I really prefer to test things with pov! :)
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org
Post a reply to this message
|
![](/i/fill.gif) |