I would like to find the slow/long axis orientation of a Toroidal surface after a series of coordinate break. I tried GLCA,GLCB,GLCC but they can tell the surface normal vector, but not the surface axis. Thanks.
Hi Yao
The Toroidal surface has one radius along the local XZ plane and another along the local YZ plane. So if you read the direction of the surface normal vector, it will define these two local planes. So I think (and please correct me if I am wrong) that it should give you the surface axis at the same time.
Sandrine
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