Patent
Multistage clipping method
Robert Matthew Callahan,Bruce Carlton Hempel,Bob Chao-Chu Liang +2 more
- 09 Jun 1989
38
TL;DR: In this paper, a method for clipping two and three dimensional graphic primitives for use in a computer graphics workstation is presented, in which the first clipping stage removes all geometric primitives which lie outside an arbitrary clipping volume or window that is an enlargement of the desired viewing volume, and the clipping volume (window) is then projected and mapped onto a virtual viewport which is larger than the real viewport.
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Abstract: A method for clipping two and three dimensional graphic primitives for use in a computer graphics workstation. During the first clipping stage, the system removes all graphic primitives which lie outside an arbitrary clipping volume or window that is an enlargement of the desired viewing volume or window. This clipping volume (window) is then projected and mapped onto a virtual viewport which is larger than the real viewport. After this mapping occurs, rendering effects (such as line styles, line width, pattern fill, hatch fill, etc.) are applied to the primitive. A subsequent stage of clipping is then applied to clip the virtual viewport to the real viewport which is the user's visible area. Use of the clipping volume (window) during the first stage of clipping makes it simpler to transform geometric primitives which are partially visible to the viewer, and gives visible primitives a richer set of invariant geometric properties so that their rendering effects may be more easily and correctly carried out.
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Citations
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33
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Girault Herve,Jean-Claude Reymond,Pierre Cauzan +2 more
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TL;DR: In this article, an indicator system satisfies multiple flight-mission requirements by providing an aircraft pilot with a visual display consisting of a movable map and navigational data, which is stored in video form in a high-capacity compact mass memory.
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Patent
Graphics display system and method including preclipping circuit
Arthur J. Collmeyer,Jeffrey H. Hoel,Paul F. King,Donald O. Stanley,Roger Sturgeon +4 more
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TL;DR: In this article, a graphics display system is described, which includes a memory circuit for storing vector data representing a graphics image, a raster memory for rasterizing the vector data into a second memory for storage, and a processor for controlling the operation of the vector memory and rastermemory circuits.
30
Patent
Graphic processing apparatus with clipping circuit
Shouji Ounuma
- 21 Nov 1983
TL;DR: In this article, the contents of the clip register and an address supplied to a bit map memory are compared by a comparator, and control operation for clipping is performed such that only data falling within the clip area is written in the bitmap memory in accordance with the comparison result of the comparator.
20
Patent
Clipping of fixed character strings in a graphics system
Bob Chao-Chu Liang
- 21 Jan 1986
TL;DR: In this article, a method for clipping fixed characters against one or more clipping boundaries for display in a graphics display system is described. But the method is not suitable for displaying on a large display.
15
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