Conversion from odd to non-zero winding number specification usi

Details Conversion from odd to non-zero winding number specification usi Conversion from odd to non-zero winding number specification usi

1992-09-25

1994-06-07

Weldon, Ulysses

Communications: electrical

Digital comparator systems

395141, G09G 114

Patent

active

053193466

ABSTRACT:
Conversion from odd to non-zero winding number convention for representation of polygons in a graphics system comprises entry of a polygon in a frame buffer using distinguished states. Special scanlines are determined and marked. Special scanlines are those of relative maxima and minima, and those bordering regions where the polygon touches itself. Each of the special scanlines is examined and entries for the polygon on a scanline are marked odd or even (down or up). The polygon is drawn for a second time. During this drawing, the distinguished state (temporary) entered on the first pass is replaced by a down or up state. The state entered is the current direction value, except for entries on special scanlines. For special scanlines the state entered is given by the marked entry in the frame buffer. This value also becomes the current direction value for subsequent entries.

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