Rick Measham nous apporta ses lumieres en ce 2005-12-17 04:04:
> A. I'm using photons to allow light to be reflected off an object. 
> However I don't seem to be able to get a perfectly straight beam of 
> light. The image below is a 16u x 16u grid. The spotlight is 72u from 
> the top of the grid and then is masked by the red 'turret' at the top in 
> order to thin it down. This does an OK job, but as the light reflects of 
> more and more objects, the wider the beam gets. Is there any way to stop 
> it getting wider?
> 
> B. Once the light reflects off the first object it starts to interact 
> with the media as I'd expect (the glow) however before it hits that 
> first object, there is no glow! How do I get the glow on the first part 
> of the beam? One solution I had was to start the beam to the left of the 
> masking turret and fit a mirror into the mask, but surely there's a 
> better way?
> 
> Cheers!
> Rick Measham
> 
> 
> ------------------------------------------------------------------------
> 
A. Try a parallel light.
b. Add a small transparent cylinder in the hole of the turret. It will make all of the
beam photons. 
Before the first reflection, photons are not taken into consideration, they are after
that first 
reflection. Adding the transparent cylinder, or a box, will stop the light and replace
it by the 
photons. It may not be exactly how it works, but describe what appens.

-- 
Alain
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