Re: 3D Plane

From: Lynn Kurtz (kurtzDELETE-THIS_at_asu.edu)
Date: 08/15/04 

Date: Sat, 14 Aug 2004 19:04:35 -0700

On Sun, 15 Aug 2004 10:08:49 +1000, Gerald Kaszuba <nospam@nospam.com>
wrote:

>Hi
>
>I have a 3d plane, and have worked out its normal. I want to know the
>distance from (x,y,z) to where z intersects the plane. i.e. x and y will
> be the same value, but z falls on the plane.
>
>Thanks
>
>Gerald

Your question isn't very well phrased; what you are asking apparently
is not the distance from a point (x,y,z) to the plane, but the point
that is the vertical "shadow" of your point on the plane. If that is
actually what you want, just plug the values of x and y into the
plane to see what z works. It has nothing to do with the normal vector
to the plane.

If, on the other hand, you want the distance from a point to the
plane, which is not the same thing, that is what you should ask for.

--Lynn

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