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how to create a normal for 3 nodes

Altair Forum User

to create a bolt hole . i need to create a plane normal to three nodes . how to create plane normal to 3 nodes

regards,

JAMIE

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QuyNguyenDai

to create a bolt hole . i need to create a plane normal to three nodes . how to create plane normal to 3 nodes

Do you mean 'a vector which is normal to plane defined by 3 nodes'?

Altair Forum User

Do you mean 'a vector which is normal to plane defined by 3 nodes'?

llyle_20499

Hello Jamie,

To get normal defined by a plane of 3 nodes you can try the below:

proc NormalFrmPlane {n1 n2 n3} {

   set lst_coord1 [lindex [hm_nodevalue $n1] 0];
   set lst_coord2 [lindex [hm_nodevalue $n2] 0];
   set lst_coord3 [lindex [hm_nodevalue $n3] 0];
   set vec1 [::hwat::math::GetVector $lst_coord1 $lst_coord2];
   set vec2 [::hwat::math::GetVector $lst_coord2 $lst_coord3];

   set normal [::hwat::math::VectorCrossProduct $vec1 $vec2];
   return $normal;
}