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Next: 11.1.1 Techniques for Rendering Up: 11.1 Reflections and Refractions Previous: 11.1 Reflections and Refractions   Contents Accelerated Reflection and Refraction

Directly calculating surface physics effects like reflection and refraction using an algorithm such as ray tracing can be expensive, and rendering almost immediately stops being interactive as scene complexity increases. It is useful to define techniques that approximate reflections or take advantage of simplifying assumptions, such as having a planar reflector with straight edges.