#version 3.5; // beta 6
To verify that my assumptions about povray light sources
are correct I tried to make ambient source with the same
lighting properties as a diffuse area light.
I think I got it but there is this mysterious constant 2*pi
which is required. I think the 2 comes from the fading equation
attenuation=2/( 1+(d/fade_distance)^fade_power ). The intensity
at the surface of the light is two times higher than at the fade
distance. But where does the pi come from? :)
http://www.pp.htv.fi/kkivisal/area.pov
_____________
Kari Kivisalo
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Attachments:
Download 'ambient.jpg' (7 KB)
Download 'area.jpg' (7 KB)
Preview of image 'ambient.jpg'
![ambient.jpg](/povray.binaries.images/attachment/%3C3BC80796.67EA2F36%40engineer.com%3E/ambient.jpg?preview=1)
Preview of image 'area.jpg'
![area.jpg](/povray.binaries.images/attachment/%3C3BC80796.67EA2F36%40engineer.com%3E/area.jpg?preview=1)
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