How can I prevent the reflections from the background?
I was under the impression that the background is composed of rendered rays
that don't hit any object and the background doesn't act as a light source.
An example of my problem  is at

http://www.xenomechanics.com/pics/aliBackground.gif

The wheels on the object are white and very reflective and as you can see
they are picking up the green from the backgound.
Thanks
Tony
xen### [at] xenomechanicscom

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Tony LaVigne wrote:

> How can I prevent the reflections from the background?
> I was under the impression that the background is composed of rendered
> rays that don't hit any object and the background doesn't act as a light
> source.


Correct. But also those rays that after one or more reflections/refractions 
don't hit anything are given the background's color. You can use the 
no_reflection object modifier to stop this from happening (doesn't affect 
refracted rays, though). It'll probably not work with background, so you 
should use a huge sphere with ambient 1 instead, for example.

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