> 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?

This is probably an inaccuracy in the photon mapping. Use more photons 
and it will probably reduce the effect. (And the render speed!!)

> 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?

Hmm... can't help you there I'm afraid. :-(

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