Hi If you want to know the distance between a point and line in 3D space :
1 - you calculate the vector director (= vecteur directeur ?) u-> of the line 2 - you select any point A from your line 3 - you calculate the vector AB-> 4 - you calculate || (AB->) ^ (u->) || / || u-> || , with || . || euclidian norm and ^ cross product the distance is d = || (AB->) ^ (u->) || / || u-> || Prince 2013/12/26 Max <[email protected]> > Hi João, > I patched something for you, maybe it's useful. > > > > > http://mathsfirst.massey.ac.nz/Algebra/PythagorasTheorem/pythapp.htm > > > Am 11.12.2013 um 02:30 schrieb João Pais <[email protected]>: > > > Am 06.12.2013, 00:51 Uhr, schrieb Claude Heiland-Allen < > [email protected]>: > > > >> On 05/12/13 23:40, João Pais wrote: > >>> Hello list, > >>> > >>> I had a doubt, will try to explain. > >>> > >>> I wanted to define a line in a 3d space through 2 points, and be able > to > >>> find out the distance from another point to that line. Since I'm very > >>> bad at math, I wanted to know if anyone has done something similar, or > >>> knows how to get to it. > >> > >> http://paulbourke.net/geometry/pointlineplane/ > >> > >> first example on the page, you just need to clamp u to [0..1] if you > >> want to make it work for a line segment instead of an infinite line. > > > > it looks interesting, and I also checked for more content with a similar > title. the thing is, my math/geometry skills are too bad, and I don't > understand where they get the formulas for the points and lines. I'll keep > watching the links, but I might not get it in time for the purpose I was > looking for. > > > > thanks anyway, > > > > João > > > > _______________________________________________ > > [email protected] mailing list > > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > >
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