Depth bounds testing

Details Depth bounds testing Depth bounds testing

2006-12-05

2006-12-05

Zimmerman, Mark (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

Reexamination Certificate

active

07145565

ABSTRACT:
Lights can be conservatively bounded within a depth range. When image pixels are outside of a light's depth range, an associated volume fragment does not have to be rendered. Depth bounds registers can be used to store minimum and maximum depth values for a light. As graphics hardware processes volume fragments overlapping the image, the image's depth values are compared with the values in the depth bounds register. If the image's depth is outside of the depth range for the light, stencil buffer and illumination operations for this volume fragment are bypassed. This optimization can be performed on a per-pixel basis, or simultaneously on a group of adjacent pixels. The depth bounds are calculated from the light, or from the intersection of the volume with one or more other features. A rendering application uses API functions to set the depth bounds for each light and to activate depth bounds checking.

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