NSI files contains the scene description for rendering. NSI stands for Nodal Scene Interface1. It was created (in 2017-2018 ) as an open standard and modern version of the RIB file (Renderman Interface Bytestream) we used to support since the early 2000s.
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There are two kinds of NSI files: ASCII encoded and binary encoded. A binary NSI file is smaller than its ASCII encoded equivalent, but an ASCII NSI file has the advantage of being human readable and editable in a text editor.
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To render an NSI file, you use the renderdl command line utility. It reads a file containing scene description commands and “executes” them to produce an image. :
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renderdl myfile.nsi |
1 For the technically inclined, one can read the full NSI specification here.