Accelerating Architectural Walkthroughs
Idea
Realistic architectural walkthroughs require interactive rendering of complex
geometric models of the architectural space. Even the most recent 3D graphics
workstations cannot render the large models fast enough. There have been
a lot of efforts in trying to reduce the number of polygons that need to
be rendered at each frame. We propose rendering adjacent rooms visible
through portals (doors, windows) by warping a depth image. To avoid disocclusion
errors occurring when unsampled surfaces become visible we use layered
Depth Images (LDIs) that generalize the idea of an image by allowing for
the existence of several samples along one ray. The LDIs are first clipped
and then warped in parallel.
The portal to the bedroom is rendered as a warped LDI. When
only a simple depth image is used, disturbing disocclusion artifacts occur.
A few of the portal depth images that are pre-combined in one LDI
We use a fast 3D clipping technique that reduces the amount of warping.
In the two images the geometry of the current room is rendered in wire
frame mode. When clipping is turned on, considerably fewer pixels are warped.
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Maintained by Voicu Popescu
Last Modified 17
February 1999