11-15-2004, 09:13 PM
What I mean by precomp is simply this: I create my own comp in a compositing software where I put together my own CG and matte painting work the way I intended it to be comped. Then, when all my work is together, like the 3D CG layers, cam map projections, etc, then I send it to the compositor so he can make a new final comp in a different file. That's where the greenscreen stuff is done.
I don't "paint" in the precomp, but the mattes I create allow me to tweak colors and things in this shot without re-rendering it all in 3D. For example, if the supervisor feels the sunlight hitting the buildings on the right side of the street needs to be more pink or brighter, I can tweak that in the comp with a custom matte (alpha channel) instead of changing the CG light and re-rendering all the frames in 3D. Remember, this is a moving shot, not just a still painting, the camera moves alot here. Re-rendering about 900 frames in 3D is painful especially at 1hour a frame.
I hope I'm making sense. Let me know if ytou have anymore questions.
PS: the time I spent on ths project including painting, CG, directing extras for the shoot, and precomps: about 6 weeks.