There is only one file type that uses the .TGC extension:
Terragen Node Clip File
Clip created by Terragen, a landscape and animation generation program; contains nodes, which are like pieces of your scene, saved separately from the entire scene that can be inserted easily into a project; includes functions like surface shaders and complex terrains that can be inserted into the scene.
To create a TGC file, right-click an aspect of the scene (objects, water, atmosphere, etc.), select, name your TGC file, choose your save location, and click .
To insert a TGC file, select, navigate to your TGC file, and click . You can also right-click different aspects of the scene (cameras, lighting, objects, etc.), select , navigate to your TGC file, and click .
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Updated: October 30, 2013