Renderman was alone in its category. REYES approach brings things other renderers couldn't render; fast motion blur, per pixel displacement, aka microsurface, e

Renderman was alone in its category. REYES approach brings things other renderers couldn't render; fast motion blur, per pixel displacement, aka microsurface, etc. No other renderer provide such fast implementation of this. Renderman was hard to learn but the promise was here: It was fast. With time the REYES approach starts to show its age (need a lot of preparation work) bad raytrace performances due to “combining” REYES and ray tracing in the same engine, etc. forcing it to fall back in the same competition line (and price) than it's competitors. Full feature animation movie is not the only market. For example Vray for Maya (used on Tron Legacy) was a good combination between ease of use inside Maya and the technical director features (features that need some dedication and knowledge, like python pre execution directly on render scene) make it a joy to use.