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» Sun Jul 31, 2011 9:49 pm

If you know your location, and the intersection point it would just be the distance forumla again distance(intersection.x,intersection.y,you.x,you.y)

If what you're saying is that you want a height value for any arbitrary point on the line. You could use lerp, and the gett function of the math plugin so it'd be

Lerp(minheight,maxheight,math.gett(green.x,red.x,arbitrarypoint.x))

If greenx and redx are equal, you'd use y values.

If you're one of those plugin shy people, the formula for math.gett is just

Gett(a,b,x)

Answer=(x-a)/(b-a)