Afaik Gelato was written by Larry Gritz after he left Pixar and was based on his former work on PRMan and BMRT. The product did not do very well (it was a revolutionary concept at that time but slow as hell), and was eventuall bought out by Nvidia and successively rewritten to use the GPU, until NVidia bought out MentalRay and eventually discontinued Gelato (very much to the dismay of a former working colleague of mine, Daniel Rind, who had invested considerable amounts of time to writing a Softimage-Gelato connection, which he then abandoned).
used to be a gpu renderer called gelato as well licensed by nVidia
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