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So far, we've built a series of faces that created a 3D model of the set, and the walls, and the window box. We can save out this model, then import it into another system, and camera project the original clip onto it to reconstruct the shot in 3D. Let's take a look in the 3D viewer. Switch to the 3D view. So what we need to do is save out the Modeler geometry with the right geo node. Let's move the Viewer over here, we'll select the Modeler node, up to the 3D tab, the Geometry > WriteGeo.
Okay, we'll browse to where we want to write it. We'll select the Desktop, and I'll just call this Modeler.obj, and we're going to save out an OBJ file. Now, to write it to disk, we just click Execute. Now, since the geometry is not animated, we only need one frame. Click OK; bang! Wrote to disk. Okay, now let's see what we've got. I will scoot this over here. Now I'm going to disable the Modeler node, so there's no geometry in our system.
We still have our camera, but there's no geometry. Okay, now let's go get the geometry we just rendered out. We'll go to the 3D tab, Geometry > ReadGeo, and of course, we'll have to browse to where we left it on the Desktop. Click on the browse folder, go to the Desktop, select our Modeler.obj file, and Open, and there is our 3D geometry.
We'll zoom in a little bit. Now, it's not very interesting, but what we can do is, using our original Read node, and the Solve Camera, we can do a camera projection of the original clip onto this geometry; no problem. So let's go to the 3D tab, Shader > Project3D. Hook up our geometry to it, to the Project3D input, to the Read node, and the camera to the Camera node, and now we have a camera projection exactly lining up with the original clip.
The Modeler node is another spectacular example of how we can use data created by Nuke's camera tracker to create brand new elements to be used with 3D compositing.
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