

How would you camera project a background plate onto a solid in After Effects as part of a moving 3D green-screen scene?
I've already done the rotoscope, keying, and tracking work, and I bonked my head against Blender a few times, which I know is better for camera reprojection, but I couldn't get one of the blender image projection steps to work, and as much as I'd like to troubleshoot it, it's a little opaque to me still. Ultimately I find that building the background elements is overkill anyways, and I can run this is as just one big plate for the BG and one for the street and it plays fine for the length of time it's on screen.
The background plate I generated (yes) works at only one reference frame, as this is a big swooping shot with moderate parallax at the beginning, but I figure I can just separate it into two planes, one for the ground plane and one for the buildings.
However, I'm not quite sure how to do the camera projection; right now I'm just using corner pin on a duplicate of the plate as it's stretched down on the ground to get the street correct, with the original plate on top with DIFFERENCE on so I can make it match pixel perfect.
Given that the program would have no way to know the correct perspective WITHIN the plate, I know some manual input is necessary, just not sure whether there's a simpler solution.