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Suppose, for instance, that you have a scene on a street corner, and there’s a shop sign with a
phone number on it, but you want to change the numbers. If you track the scene and have
standing geometry for the sign, you can project the footage onto it, do a UV render, switch the
numbers around with a Paint node, and then apply that back to the mesh with a Texture2D.
The UV renderer can also be used for retouching textures. You can combine multiple DSLR still
shots of a location, project all those onto the mesh, UV render it out, and then retouch the
seams and apply it back to the mesh.
You could project tracked footage of a road with cars on it, UV render out the projection from
the geometry, do a temporal median filter on the frames, and then map a “clean” roadway
back down.
Loading 3D Nodes into the Viewer
When you load a 3D node into the viewer, it switches to a 3D Viewer, which lets you pan, zoom,
and rotate the scene in 3D, making it easy to make adjustments in three dimensions.
The 3D Viewer.
The interactive 3D Viewer is highly dependent on the computer’s graphics hardware, relying on
support from OpenGL. The amount of onboard memory, as well as the speed and features of
your workstation’s GPU, make a huge difference in the speed and capabilities of the 3D Viewer.
Displaying a node with a 3D output in any viewer will switch the display type to a 3D Viewer.
Initially, the contents of the scene will be displayed through a default perspective view.
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