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Question about 2dm format


pjr
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I couldn't find any answer to my question on http://www.xmswiki.com/xms/SMS:2D_Mesh_Files_%28*.2dm%29

Therefore, i ask here in the forum.

In the .2dm-format, every e.g. linear triangular element has three nodes.

The format for such an element is then "E3T id n1 n2 n3 matid " where ni are the nodes.

The question is: Are these nodes (also for quadrilaterals) in an ordered manner, clock- or counterclockwise?

It seems to me that the nodes are ordered in a certain sense for quadrilaterals (triangles are always kind of ordered) but i dont know whether there is a "global ordering sense", like clock- or counterclockwise.

Thanks,

patric

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