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Physically-Correct Lighting Simulation
Physically-Correct Lighting Simulation
The creation of realistic imagery is an important goal as it is often
easier, less expensive, and more effective than manufacturing mockups
and prototypes. Only the knowledge that the visual results are reliable
and correct within a quantifiable error bound allows the user to trust
the results and base important design decisions on them. The almost
exclusive use of rasterization-based hardware in current VR systems
makes it hard to obtain reliable results because it relies on the use
of approximations even for such simple optical effects as shadows and
reflection.
Because ray tracing closely models the physical
transport of light, it can provide correct results easily.
Ray tracing simplifies the modeling and design process, where
individual objects and their material properties may be defined
independently, while the underlying ray tracing engine automatically
combines the shading results to the correct image. There is no need to
deal with complex multi-pass rendering in the application.
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