On Mon, 7 Apr 2008 20:54:07 +0200, "Clemens Eisserer" wrote: > I have some problems understanding the following behaviour: You don't understand what this paragraph is specifying? Or you don't understand why you appear to be getting results that don't seem to match it? > > Abutting edges must match precisely. When specifying two polygons > > abutting along a common edge, if that edge is specified with the > > same coordinates in each polygon then the sum of alpha values for > > pixels inside the union of the two polygons must be precisely one. > > When I have two trapezoids, where the first ends at 100/90 and the > second begins at 100/90 (speaking about the horizontal edges) - > shouldn't both accumulate to one large and seamless trap. If not, > whats wrong with my testcase? What does "100/90" mean? (If that matters.) Yes, two trapezoids with a common edge should accumulate seamlessly. And yes, that's the intent of the paragraph you quoted. So given that, I don't know what you're actually seeing, (presumably something different). Could you please provide the test case and results so that we can investigate the issue? -Carl
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