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Drawing very thin triangles with IW_GX_TRI_LIST turn into points

I'm using IW_GX_TRI_LIST to output my primitives. Most all of the time I need to draw rectangles, triangles, circles. From time to time I need to draw very thin triangles (width=2px for example). I thought it should look like a line (almost a line) but it looks like separate points :) Following picture shows what I'm talking about: ![alt text][1] First picture at the left side shows how do I draw a rectangle (counter clockwise, from top right corner). And then you can see the "width" of the rectangle which I call "dx". How to avoid this behavior? I would it looks like a straight (almost straight) line, not as points :) [1]: http://i62.tinypic.com/2n6td0h.png

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