Projection view creation method with vector discrimination onto

Details Projection view creation method with vector discrimination onto Projection view creation method with vector discrimination onto

1994-11-29

1996-12-17

Jankus, Almis R.

G06F 1570

Patent

active

055862322

ABSTRACT:
A method of creating a view of a curved line projected onto a curved surface in a CAD system by using a vector discrimination technique which reduces computation steps required for projection. The curved line and the curved surface are divided into a group of straight line segments and a group of planar surfaces, respectively. One of the straight line segments is selected and a first vector is formed at an end of the straight line segment. After a discrimination process using the first vector, a combination of one straight line segment and one planar surface pointed to by the first vector is obtained, and the projection operation starts with this combination. Second and third vectors are then formed at both ends of an edge of the planar surface. The straight line segments within the range delineated by the second and third vectors are projected onto the planar surface. If there is a straight line segment falling outside the range, the next planar surface is selected and the excessive part of the line segment is projected onto the newly selected planar surface. The projection operation thus continues until all the straight line segments are projected on the planar surfaces.

REFERENCES:
Foley et al.; Computer Graphics: Principles and Practice; 1990; pp. 229-237, 471-477, 680-685, 698-711, 745-753, 772-773 1990.
Luzadder, Warren J.; Fundamentals of Engineering Drawing, eigth edition; 1981; pp. 69-73, 75-97, 145-154, 185-205, 213-232 1981.

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