Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
1998-08-19
2001-05-15
Vo, Cliff N. (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
Reexamination Certificate
active
06232975
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to three dimensional (3D) computer aided design (CAD) systems, and more particularly, to a method, apparatus and article of manufacture for generating reverse daylighting on a surface on a computer-generated image.
2. Description of Related Art
Daylighting of surfaces is used in 3D CAD systems to illustrate to the user the shape of a surface and to indicate the projection of a surface from an intersecting point or line.
Present methods require the user to perform additional operations, such as adding vertices on entities or objects within the drawing to define the resolution for the daylighting. For large objects being daylighted, the extra operation of adding vertices requires additional user time to create the completed CAD drawing, making the CAD drawing more expensive and more time consuming to complete.
Further, volume calculations are performed using the daylighted projection lines. The use of too few or too many vertices as described above will affect the precision and accuracy of volume calculations performed by the computer.
It can be seen, then that there is a need in the art for a more uniform method for creating daylighted objects. It can also be seen, then, that there is a need in the art for a daylighting method that is faster and less expensive. It can also be seen that there is a need in the art to improve the accuracy of volume calculations by creating a uniform method for creating daylighted objects.
SUMMARY OF THE INVENTION
To overcome the limitations in the prior art described above, and to overcome other limitations that will become apparent upon reading and understanding the present specification, the present invention discloses a method, apparatus and article of manufacture for daylighting a base object with a computer by creating projection lines. The origination points of the projection lines are determined by determining intersections between a plane of the base object and a first object, between the plane of the base object and an edge between a face of the first object and a face of a second object, and the plane of the base object with at least one other object, the intersection points being vertices. A network surface is created by connecting the vertices, and the projection lines are drawn from each vertex of the network surface to the base object such that the projection line intersects the base object.
The general object of the present invention is to daylight an object. The specific objects of the invention are to provide a method for daylighting an object consistently, while using fewer computer resources and less user interface time to create the daylighted surface.
REFERENCES:
patent: 5872902 (1999-02-01), Kuchkuda et al.
patent: 5966673 (1999-10-01), Shannon, Sr.
patent: 6014343 (2000-01-01), Graf et al.
Hesson Kevin Mark
Lewis John Murchie
Putnam Christopher Eric
Autodesk, Inc.
Gates & Cooper LLP
Vo Cliff N.
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