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Interactive Caustics
Interactive Caustics
With the advancements in real-time ray tracing and new global
illumination algorithms, we are now able to render the most important
illumination effects at interactive rates. One of the major remaining
issues is the fast and efficient simulation of caustic illumination, e.g. the
illumination from a car headlight. The photon mapping algorithm is a
simple and robust approach that generates high-quality results, and is
the preferred algorithm for computing caustic illumination. However,
photon mapping has a number of properties that make it rather slow on
todays processors. Photon mapping has also been notoriously difficult
to parallelize efficiently.
The OpenRT real-time ray tracing
engine incorporates a complete framework for real-time photon mapping that
efficiently combines real-time ray tracing, optimized and improved
photon mapping algorithms, and efficient parallelization across
commodity PCs. Our system achieves real-time photon mapping performance
of up to 22 frames per second
on non-trivial scenes, while still allowing for interactively updating
all aspects of the scene, including lighting, material properties, and
geometry.
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