POV-Ray: Newsgroups: povray.binaries.images: Equivalent area light and ambient source: Equivalent area light and ambient source

POV-Ray : Newsgroups : povray.binaries.images : Equivalent area light and ambient source : Equivalent area light and ambient source		Server Time 17 Aug 2024 10:18:08 EDT (-0400)

From: Kari Kivisalo
Date: 13 Oct 2001 05:21:28
Message: <3BC80796.67EA2F36@engineer.com>

#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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Download 'ambient.jpg' (7 KB) Download 'area.jpg' (7 KB)

Preview of image 'ambient.jpg'

Preview of image 'area.jpg'