We can scale the vectors with a constant factor , i.e. . In case we have a point reflection. We can even scale with a vector by multiplying the corresponding coordinates by that of , i.e. .
Syntax in Pov-Ray: scale w
In case all coordinates of are except one which is -1 this is a reflection on the plane given by the set of points where the corresponding coordinate is 0. So for we get a reflection on the --plane.
Andreas Kriegl 2003-07-23