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

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