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A 3D re-projection shot is another very important 3D compositing technique. You start with a live action plate, and the match move department gives you a camera track and a polygonal surface inside the shot, that you then can lift some of the live action out, animate it and re-project it. It will perfectly match the perspective over the whole moving shot. To see how it works, let's load script. We'll open the Script browser, go to Nuke Workshop, Lesson_08_Media, and go to 3D_reprojection. Load that script.
We'll start by playing our half-res reference movie. So, this is the live action plate. I've actually just borrowed this from the camera projection shot that we did earlier. So, let's take this as our live action plate that we sent to the match move department. When the shot is finished, this is the kind of effect we can do. The animation is being added to the live action plate and rephotographed and maintains a perfect perspective throughout the whole plate. Let's see how it works. We'll switch to the 3D view to see the setup for the shot. There we are.
This is the whole thing. This is the Tower Camera here. That's the animated camera we got from the matchmove department. This is the Projection Camera that's projecting the animation on to the polygon, and this polygon, that we got from the match move department as well. So, I'm going to disable the Reprojection Camera. Turn it off just so it won't be in our face, and disable the materials. Then we'll add a CheckerBoard to our polygon so we can see what it's doing. There! Now if we look through our Tower Camera, this is our Scene Camera.
We can see what the polygonal surface is doing, without the live action. This is the polygon that we're going to re-project the animation to and then re-film it with our animated camera. We'll switch to the 2D view and hook the Viewer up to our ScanlineRender node. So, this is the output of our 3D scene. We can see the rendered polygon with the checkerboard seen through the camera.
This then is simply composited over the original live action plate. Now we have a polygonal surface that moves perfectly with the live action plate that we can project any kind of an animation on we want, and maintain a perfect perspective. In our next video, we'll see how to set up the shot re-projection.
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