Omnidirectional shadow texture mapping

Details Omnidirectional shadow texture mapping Omnidirectional shadow texture mapping

2005-04-05

2005-04-05

Jankus, Almis R. (Department: 2671)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

Reexamination Certificate

active

06876362

ABSTRACT:
An invention is provided for rendering using an omnidirectional light. A shadow cube texture map having six cube faces centered by a light source is generated. Each cube face comprises a shadow texture having depth data from a perspective of the light source. In addition, each cube face is associated with an axis of a three-dimensional coordinate system. For each object fragment rendered from the camera's perspective a light-to-surface vector is defined from the light source to the object fragment, and particular texels within particular cube faces are selected based on the light-to-surface vector. The texel values are tested against a depth value computed from the light to surface vector. The object fragment is textured as in light or shadow according to the outcome of the test.

REFERENCES:
patent: 6034691 (2000-03-01), Aono et al.

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