Hi Guys!
I am working on a promo that will go on DVD and I am using the Non-Photorealistic Renderer for an animated walkthrough of a casino that has to be build in the future.
Because I will layer it with other material (stills with Global Illumination and video) I just use the outlines. When I render the image some frames render half or whole with broad grey lines from top to bottom.

I am rerendering it right now as sequenced tiffs, so I can try to adjust the individual frames. So I do not have an example at hand.

But has anybody seen this before?

I first thought I was crossing a bulb, in my animation.
The other thought is that I might be right on the same location as one of the lines, but maybe some of you have fixed this before I go all trial and error and get angry (Don't fear, I will not grow and get green, but I just don't like being angry).

Anybody?