Valdemir Carrara wrote:
>
> 2 - There's something strange in the way that light
>   intensity is calculated.

Just use fade_power 2 and fade_distance <diameter of the source>
or sqrt(area of the source) if using irregular source. Fade distance
links the size of the source to intensity. This produces scale independent
light source. Have a look at cornell.pov in 3.5 radiosity files to see
how it works and produces physically correct results. Compare the
result to http://www.graphics.cornell.edu/online/box/box.jpg

The equation is an empirical approximation for near field axial area
source intensity and is more realistic than 1/d^2 for real, non microscopic
sources. At a distance of 5 times the source diameter both equations are
within 1%. Closer to the source the pov equation is more realistic and
at larger distances the difference is minimal.


_____________
Kari Kivisalo

Post a reply to this message