"In computer cinematography, the process of lighting design involves placing and configuring lights to define the visual appearance of environments and to enhance story elements. This process is labor intensive and time consuming, primarily because lighting artists receive poor feedback from existing tools: interactive previews have very poor quality, while final-quality images often take hours to render."
Lpics is Pixar's Hybrid Hardware-Accelerated Relighting Engine for Computer Cinematography. It's an interactive cinematic lighting system used in the production of computer-animated feature films containing environments of very high complexity, in which surface and light appearances are described using procedural RenderMan shaders. Pixar's system provides lighting artists with high-quality previews at interactive framerates with only small approximations compared to the final rendered images. This is accomplished by combining numerical estimation of surface response, image-space caching, deferred shading, and the computational power of modern graphics hardware.
Lightspeed, on the other hand, has been developed by ILM, Tippett and Stanford and MIT graphics labs. The system uses hardware shaders, but improves on Pixar's Lpics by supporting opacity, motion blur and automatic translation of Renderman shaders.
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