Vector v1;

Vector v2;

Edge e = v2 - v1;

As this edge is oriented freely in 3D space, How do you know which x,y,z in these vectors is the major axis?

Thanks

Jack

Do you mean which axis out of x, y and z has the longest projection onto it? It would be the coordinate axis with the largest magnitude (absolute value) out of e.x, e.y and e.z.

Thanks, that looks simple enough... I am just silly.

Jack

Would there be a case where the projections on all three axis have the same magnitude?

How should I decide if this happens?

Thanks

Jack

Of course such a case exists. You just need two vectors whose difference is the same along all axes. What happens then is up to you to decide, we don't know anything about your goals here.