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mike74

plane issue

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Let's say you have three noncollinear points that define a plane. Now, let's say you have a completely different point. Is there an easy way to tell which side of the plane this new point falls on? Mike http://www.coolgroups.com/

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Yes. First, find the plane equation (Ax + By + Cz + D = 0) for the 3 points. Next, plug the point into Ax + By + Cz + D and the sign of the result indicates which side it is on. 0 means it is on the plane, of course.

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