>
> What is the best way to get the distance between two points?
>
> ie I want the straight line distance between (0.3, 3, -5) and (6, -3.54,
> 75)
>

Given two points: P1 = (x1, y1, z1) and P2 = (x2, y2, z2)

Distance is:

double d = Math.sqrt(x1*x2 + y1*y2 + z1*z2)

or I prefer for readability sake:

import javax.vecmath.*;

....

Point3d p1 = new Point3d(0.3, 3, -5);
Point3d p2 = new POint3d(6, -3.54, 75);

double d = p1.distance(p2);

See the comp.graphics.algorithms FAQ for lots solutions to problems such as
this one:

http://www.faqs.org/faqs/graphics/algorithms-faq/

Tip: use squared distance where possible, as computing the square root is
expensive:

double dSqrd = p1.distanceSquared(p2);

Simeon

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