Contour lines using vPython

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Newsgroups gmane.comp.python.visualpython.user
Message-ID <3974052.1303303677391.JavaMail.root@mswamui-thinleaf.atl.sa.earthlink.net>
I'm looking for a way to draw E and B fields using vPython. I have the equations to find the vector at a point, but want to draw contour lines between two particles just as a start. Any suggestions or code segment that shows how to do that?

Thanks,
-d

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