How to display a hidden line as discontinous line in OpenGL

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Using OpenGL I can draw a 3D Cube. There are some reasons that I must display a hidden line as a discontinuous line. 3D Cube is just an example. Actually, the object I must display is more complicated.
Does OpenGL have any commands that help me to do that? Or I have to find an algorithm?
I do not know neither OpenGL commands nor algorithm.
Please help!
Thank you very much.
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pass
 

Re: How to display a hidden line as discontinous line in Ope

I draw this picture for anyone that does not understand what I mean. You can see 3 hidden line from this viewpoint. I can write an OpenGL program that draw this cube, I can rotate but CAN NOT DISPLAY HIDDEN LINES AS DISCONTINUOUSE LINES LIKE THIS. You know, when rotating, some hidden line become visible and the others become invisible.
There is a trick. Just mapping on the face of this cube parallel black rectangles. I know the way, HOWEVER I don't like this trick.
Thanks for reading.
password is password
 

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