I really don’t know if this is possible to do, so let me try to find out.
Currently I am using a lot of compositing/render layers involving animating a character. Due to long render times I am doing the following
I first render a still backplate image
My actual scene consists of only the character and any props all on 1 layer. This is animated for whatever the scene calls for.
In order to get the ground to accept a shadow from the character, I have a shadow plane… this is not visable in the final render, but it catches the shadows.
The rendered character and shadows are then alpha overed the background plate all within blender and all at the same time. So I first load up my background plate into the node tree, then I hit render animation. It first renders the character and does the renders the shadows and the final step is that is alpha overed the background plate.
So that works all well and good providing I am only using 1 camera and that camera has to be “locked down” too match the background plate.
What I want to do is use 2 cameras and 2 backplates… lets say we have 200 frames and the character is animated that whole time.
-I would set up camera 1 in the timeline and use a camera marker at frame 1 than ctlB to bind that camera
From frame 1 - 100
-camera 2 would then be set up via a marker to take over at frame 101-200
My problem is that I have to somehow have a way to tell the compositer to “switch” and begin using background plate 2 at exactly frame 101, and alpha over that image, instead of background plate 1
Is it possible to do? If so, tell me what I would need to do different in the compositor.