System and method for displaying shadows by dividing surfaces by

Details System and method for displaying shadows by dividing surfaces by System and method for displaying shadows by dividing surfaces by

1995-09-12

1998-09-15

Fetting, Anton

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06F 1520

Patent

active

058086200

ABSTRACT:
Shadow images, which are formed on a light-receiving surface by occluding light emitted from a light source with at least one occluding surface, are drawn by the generating data representative of brightness discontinuity edges that partition the light-receiving surface into loop areas that are completely occluded by the occluding surface and loop areas that are partially or totally irradiated by the light source. An irradiation state is assigned to each loop area. The loop areas are then divided into meshes according to the irradiation state assigned to the loop area. Pixel data is generated for each element of the mesh and output for display on a display device.

REFERENCES:
patent: 5175806 (1992-12-01), Muskovitz et al.
patent: 5555352 (1996-09-01), Lucas
patent: 5572235 (1996-11-01), Mical et al.
Drettakis et al., A Fast Shadow Algorithm for Area Light Sources Using Backprojection, Computer Graphics, pp. 223-230, Aug. 1994.
Stewart et al., Fast Computation of Shadow Boundaries Using Spatial Coherence and Backprojection, Computer Graphics, pp. 231-238.
Thiron, Realistic 3D Simulation of Shapes and Shadows for Image Processing, Graphical Models and Image Processing, pp. 82-90, Jan. 1992.

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