Patent ID: 7053911

Claim:
A method for incorporating an inset geometry into a background geometry within a computer graphics system, the method comprising the steps of: constructing a skirt with skirt polygons, around a perimeter of the inset geometry with the skirt extending out to the background geometry; constructing a cutter polygon from outside perimeter vertices of the skirt; removing portions of the background geometry that are surrounded by the cutter polygon; clipping the skirt polygons against background polygons in the background geometry so that the polygons in the skirt overlay the background polygons to form clipped skirt fragment polygons; computing updated vertex coordinates in a projection direction for the clipped skirt fragment polygons; constructing a first drop wall with top vertices that are shared with perimeter vertices of the inset geometry; constructing a second drop wall with top vertices that are shared with the skirt polygons along the perimeter of the inset geometry; and intersecting the first drop wall with the second drop wall to prevent visual anomalies along the perimeter of the inset geometry.