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Old   July 9, 2010, 05:38
Unhappy surface Normals
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Madhukar@NAL
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Hi to all..
I generated 3D unstructured Mesh in gridgen. Now need surface normals.
So can anybody know how to take surface normals, by any commercial software package & aslo by C Programming..
Plz reply me ...

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Old   July 9, 2010, 07:49
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Check any good Finite Element book and you should find this described in details: for a given planar surface (a polygonal face) take two intersecting vectors and calculate their cross product, this will give you the normal to that surface ...

Also you can try ... Google:

http://www.opengl.org/wiki/Calculating_a_Surface_Normal

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Old   July 12, 2010, 00:18
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Thank Q for reply,
Is there any method to get surface normals by commercial CFD softwares?..
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