Hardware clipping device which compares objects with boundaries

Details Hardware clipping device which compares objects with boundaries Hardware clipping device which compares objects with boundaries

1997-09-16

1999-11-09

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

G06F 1530

Patent

active

059823801

ABSTRACT:
It is judged that a vertex exists within a view volume when values stored in registers (231 to 236) are all "1". In other words, whether the vertex exists within or beyond the view volume can be judged by whether the values stored in the registers (231 to 236) are all "1" or not. To meet this requirement, a clip code generation/judgment unit (20) comprises a 6-input AND gate (24) which obtains a logical product of the values stored in the registers (231 to 236) to output a judgment signal (M1). With this configuration, a first step for clipping, i.e., the judgment on whether a primitive exists within or beyond a view volume is implemented in hardware, and thereby the operating speed is improved.

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James D. Foleyet al., "Clipping Against a Canonical View Volume in 3D," Computer Graphics: Principles and Practice, Second Edition, Addison-Wesley Publishing Company, Reading, Massachusetts, pp. 271-274, Nov. 1992.
James H. Clark, "The Geometry Engine: A VLSI Geometry System for Graphics," Computer Graphics, vol. 16, No. 3, Jul. 1982, pp. 127-133.
"Clipping Against a Canonical View Volume in 3D," Computer Graphics: Principles and Practice, Second Edition, pp. 271-274.

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