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The Basic 3D System

The 3D workspace is defined by a group of nodes in your script. The most basic setup includes a Camera node, a Render node, a Scene or Geometry node, and nodes that provide the 2D images you want to pipe into the 3D compositing space.

The basic 3D node tree: 2D image,
geometry, scene, render, and camera.
 

The 3D Viewer

The Geometry or Scene Node

The Camera Node

The ScanlineRender Node