Starting layers part way in a script

[Akiva]

Hey guys, I've only just started getting really stuck into Nuke and am loving it, but a few things still get me from time to time. Such as....

the "timeline" for lack of better word. I have an occlusion pass that starts half way through the comp. Its frame numbering starts at the frame it is supposed to come into the comp (f100), but for the previous 99 frames, it still affects the comp as if those frames in the occ. pass are black, thus darkening the image.

What am i missing?

Thanks

Dave

[nathan]

I believe the problem is you need to disable your operations that use the occlusion pass before frame 100.

For instance if you are multiplying your diffuse pass by the occlusion pass then anything before frame 100 is going to be multiplied by zero or whatever you tell the Read node for the occlusion pass to do with frames before the first frame. So you will have disable your calculations until the first frame of your occlusion pass.

You could also look at your Read node for the occlusion pass and change the value of what to do with a frame before the first frame. Such as hold, bounce, loop, or black.

[Akiva]

Of course! It's always something simple isn't it.

Thanks

[Diogo Girondi]

I don't even miss a 'timeline' anymore.

Just set the expression =frame<100 on your merge disable, it will probably work.