I think I have experienced a problem similar to this myself, I was pointing
3 cylinder lights (red,green and blue; in parallel) at a reflective box.
And catching their reflected light on another box.  Instead on 3 spots
(r,g,b) of light, I got 1 spot of white light, that appeared to be 'chopped
off'

If I replaced the cylinder lights with spotlights I got the expected
results.

I posted here, a while back about this, asking whether it was a known bug.
Someone sorta verified this, so I just assumed it a bug and left it at that.

As for the other problems you are experiencing, I can't help.


Rohan Bernett wrote:
>The first scene has two lasers (blue and green) reflecting off mirrors which
>then hit a flat white test surface. The weird thing is that instead of
>getting a green and a blue spot, I get two large cyan ones. I tried
>commenting out the mirror in front of the blue laser, and I got the
>expected blue spot, but the green one still produced the large cyan spot.
>Even weirder, I seem to have two extra cyan beams which go and hit the
>walls of the room and come at right angles to the direction of the original
>beams.

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