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OpenGL NURBS curve drawing problem

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I would like to draw a curve thread in my application. But there's a problem when i decide to use NURBS curve to draw a thread with antialiasing enabled! My curve is a line strip evaluated by NURBS. The problem is, I cannot make my thread thicker by setting the line width when antialiasing is enabled. When I queried OpenGL on range of antialiased line widths, i was told that the range is from 1.0 to 1.0! That means i cannot gain a curve which is both antialised and thick. But I NEED the thread is both aliased and more than 1.0 width! My graphic card is Wildcat II 5000 and its driver is the latest! I've tried the query on another PC with even a poor graphic card, it shows the range is 0.5 to 7.5! But why does my WildcatII cannot support antialised line with non-1.0 line widths! Now, if my graphic card indeed can not support that, is there an alternative way to draw my curve thread? Can i represent the curve thread with a pipe model? But there will be another problem, how can i garantee the axis of the pipe along a specified NURBS curve and the thickness of the pipe uniform everywhere? Any helps and advices needed! Thanks in advance!

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