surface Normals

madhukar_nal · July 9, 2010, 06:38

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 ...

---
Madhukar

DoHander · July 9, 2010, 08:49

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

Do

Do

madhukar_nal · July 12, 2010, 01:18

Thank Q for reply,
Is there any method to get surface normals by commercial CFD softwares?..

July 9, 2010, 06:38	surface Normals	#1
madhukar_nal New Member Madhukar@NAL Join Date: Mar 2010 Posts: 13 Rep Power: 16	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 ... --- Madhukar

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July 9, 2010, 08:49		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 19	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 Do Do

July 12, 2010, 01:18		#3
madhukar_nal New Member Madhukar@NAL Join Date: Mar 2010 Posts: 13 Rep Power: 16	Thank Q for reply, Is there any method to get surface normals by commercial CFD softwares?..