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Dynamic Scenes
Dynamic Scenes
Recently developed interactive ray
tracing systems combine the high performance of todays CPUs with
new algorithms and implementations to achieve a flexible and
high-performance rendering system offering high-quality, but
nonetheless interactive 3D graphics. However, due to its history
in off-line rendering, interactive ray tracing is usually limited to
static scenes and simple walkthroughs. In order to become truly
interactive ray tracing must efficiently support dynamic scenes.
The OpenRT real-time ray tracing
engine implements a simple and practical method that allows to
interactively ray trace dynamic scenes in a distributed PC cluster
environment. Our method separates the scene into independent objects
with common properties concerning dynamic updates -- similar to OpenGL
display lists and scene graph libraries. Three classes of objects
are distinguished: Static objects are treated as before, objects
undergoing affine transformations are handled by transforming rays, and
objects with unstructured motion are rebuilt whenever necessary. Using
this approach, an interactive ray tracing system is able to efficiently
support a wide range of dynamic scenes.
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