Dreamworks used Renderman(Pixar’s Renderman) along with several other commercial package for a Shark Tale. When Dreamworks acquired PDI, who made Shrek under contract for DWA, there was essentially a war between the two pipelines and PDI won. I was on the PDI side of the company, but there was a lot of positive things about the Renderman pipeline.

Both companies each had their own renderer & rendering development team before the acquisition. And their own pipelines. A couple decades later, that’s still true.