In article <399### [at] gmxnet>, Lars <gro### [at] gmxnet> wrote:

> > Uh, what is ies data? And what do you mean by "light-planes"?
> 
> ies-files represent the light distribution of a source. This is
> important if you want to simulate an architectural scene.
> 
> If there was a "parallel" area light in povray, one could write
> the macro by modeling the light distribution with plane light
> sources with different amplitudes.

There are parallel lights in MegaPOV.


> I wonder if it makes sense to try something like this with a
> sufficient amount of spotlights - though the "resolution" would
> give bad performance.

The large amount of lights would probably make things render very slowly.


> I would like to try povray to simulate the behavior of some
> materials in an interior scene, with the effects of different
> light sources. At the moment this is impossible, as noone has a
> real point light or spot light at home.

You still haven't explained what format the ies data is in...is it some 
sort of image map specifying the color and intensity of a planar light 
source? Color and intensity over the surface of a patch or polygon? Or 
simply a bunch of light sources? Does it store the geometry of the 
scene, or just lighting?
It sounds like my pigmented light patch might be useful for this, I will 
have to get back to work on it...

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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