Resolvability test and projection size clipping for polygon face

Details Resolvability test and projection size clipping for polygon face Resolvability test and projection size clipping for polygon face

1979-05-14

1981-09-22

Gruber, Felix D.

Boots, shoes, and leggings

358103, 434 38, G09B 908, H04N 718

Patent

active

042913802

ABSTRACT:
A flight simulator combines flight data and polygon face terrain data to provide a CRT display for the windows of an aircraft trainer. The data base contains position data defining the relative position of each vertex of each polygon face, and visual data concerning the color, intensity, etc. of each face. In addition, the data base contains resolvability data for determining which faces, as displayed on the CRT, would have dimensions less than the resolvability of the display system. The resolvability standard is defined by a resolvability code (RC) and is based on the smallest resolvable angular subtense (.theta.rc). The angular subtenses (.theta. major and .theta. minor) of each face is determined by representing each face by a rectangle having a long side (S major) and a short side (S minor), and combining these side values with o (the S major unit vector) and n (the unit vector normal to the plane of S major and S minor) in a trigonometric relationship. .theta. major is compared with .theta. minor and the smaller of the two, .theta. min is compared with .theta.rc to determine whether that face is below the visibility threshold and should be dropped from further processing.

REFERENCES:
patent: 4179823 (1979-12-01), Sullivan et al.
patent: 4179824 (1979-12-01), Marsh
patent: 4181953 (1980-01-01), Osofsky
patent: 4208719 (1980-06-01), Lotz et al.

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