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Compute normal of a plane from three points
Vector!(T,3) planeNormal(T) ( Vector!(T,3) p1, Vector!(T,3) p2, Vector!(T,3) p3 );
Vector3f n = planeNormal( Vector3f(0, 0, 0), Vector3f(0, 0, 1), Vector3f(1, 0, 0) ); assert(isAlmostZero(n - Vector3f(0, 1, 0)));