For use as a graphics workstation, the Indigo was equipped with a two-dimensional framebuffer or, for use as a 3d-graphics workstation, with the Elan graphics subsystem including one to four Geometry Engines (GEs).
"Pre-IMPACT" options consisted of the following options: SGI XL24, SGI XZ, SGI Elan and SGI Extreme).
These graphics were a port of the Indigo²'s XZ (Elan) graphics into Indy - they offered very good non-textured 3D performance at the time, sacrificing a bit of 2D performance in return.
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