3D scene used by Indigo Renderer, a program used for generating photorealistic images; saves an .IGS scene file, but packages it using .ZIP compression so the file size is smaller; often exported using the Indigo Renderer plug-in, which is available for several 3D modeling products, including 3ds Max, Blender, Cinema 4D, and Maya.
PIGS files can be imported into Indigo Renderer and then rendered to generate the final image.
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