Order of points on a line Given a 3D vector defining a line and two points known to be on that line how would you calculate which is furthest along the line?
By furthest I mean, in the direction of the vector. I.E. furthest from the origin.
EG if I had a point in 2D space a[5, 0] and another b[12, 0] and a normalised vector defining the line [1, 0] how could I find out if a was behind b.

I was really over-thinking the problem. realistically speaking I just needed the distance. I.E. 
(x,y,z)
(u,v,w)∈R3 

if x2+y2+z2 > u2+v2+w2.

