In article <3eb000fd@news.povray.org>, Tyler Eaves <tyl### [at] cg1org> 
wrote:

> Is it possible to simulate a projected image using photons and radiosity?

Basically, you want to use a lens to focus light reflected from a scene 
onto a screen? This is possible in theory, but would be very, very slow. 
There's a reason raytracers like POV-Ray primarily follow light 
backwards from the camera.
Photons and radiosity do simulate light travelling through the scene, 
but the current implementation of photons doesn't simulate diffuse 
scattering and you would need insane radiosity settings to get more than 
a blurry glow. This is just not the type of thing you want to simulate 
fully, your best bet is to do some kind of mock-up. You could render a 
view of the scene from what the "camera" would see and use that on a 
transparent image map with light shining through it onto the screen, 
perhaps using projected_through to get the lighting set up right. In 
MegaPOV, I think you could skip the first render stage and use a camera 
pigment for the projection filter.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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