Method and apparatus for drawing lines, curves, and points coinc

Details Method and apparatus for drawing lines, curves, and points coinc Method and apparatus for drawing lines, curves, and points coinc

1992-07-17

1995-01-03

Zimmerman, Mark K.

395125, 395129, 395130, G06F 1572

Patent

active

053793706

ABSTRACT:
A method, for execution by a graphics processing system (10), for rendering objects for display to a viewer upon a display (20) having a plurality of display pixels. The method includes the steps of, for a surface to be displayed having a surface marking coincident therewith, (a) moving the surface marking towards the viewer or, alternatively, moving the surface away from the viewer, by an amount that is function of a parameter (S) and also a scale factor (K) that expresses a relationship between viewer eye coordinate units and display pixel units. The parameter (S) determines a maximum slope for the surface, relative to a viewing plane, such that the step of moving will not cause a portion of the surface marking to be obscured by the surface. The step of moving includes a step of (b) applying a predetermined transformation T'.sub.e from a viewer eye coordinate system to a modified viewer eye coordinate system. The predetermined transformation T'.sub.e is selected as a function of whether a perspective projection or an orthographic projection of the surface and surface marking upon a viewing plane is performed. For the perspective projection, the transformation T'.sub.e is shown to also compensate for the movement of the second object towards the viewer.

REFERENCES:
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patent: 4682217 (1987-07-01), David et al.
patent: 4875097 (1989-10-01), Jackson
patent: 4882679 (1989-11-01), Tuy et al.
patent: 5068803 (1991-11-01), Valdes et al.
patent: 5245700 (1993-09-01), Fossum

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