Christopher James Huff wrote:

> 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.
> 

Okay, darn. I wasn't interested in the "effect" so much as the modeling.
I've been learning some basic optics in my physics class, and wanted to see
if I could model some of it in pov.

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