We present a GPU accelerated volume ray casting system
interactively driving a multi-user light field display.
The display, driven by a single programmable GPU, is
based on a specially arranged array of projectors and
a holographic screen and provides full horizontal parallax.
The characteristics of the display are exploited to
develop a specialized volume rendering technique
able to provide multiple freely moving naked-eye viewers
the illusion of seeing and manipulating virtual volumetric
objects floating in the display workspace.
In our approach, a GPU ray-caster follows rays
generated by a multiple-center-of-projection technique
while sampling pre-filtered versions of the dataset
at resolutions that match the varying spatial
accuracy of the display.
The method achieves interactive performance and
provides rapid visual understanding of complex
volumetric data sets even when using depth oblivious
compositing techniques.
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