Casting shadows

Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension

Reexamination Certificate

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Reexamination Certificate

active

07616201

ABSTRACT:
A method, apparatus, and article of manufacture are configured to cast a shadow for a two-dimensional vector geometry. A two-dimensional computer-generated rendering comprised of vector geometry is obtained. A face of the vector geometry is then selected and a virtual height is assigned to the face. Once a location of a virtual light source is defined, a shadow for the vector geometry is created and displayed based on the virtual height of the face and the location of the virtual light source.

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Reeves, W. et al., “Rendering Antialiased Shadows with Depth Maps,” Computer Graphics, 21(4):283-291, Jul. 1987.

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