"vrotate" is not a macro, it's an inbuilt vector function. Given
the coordinate vector of a point and a vector of three angles (as
with "translate"), it calculates the coordinate vector of the point
after these rotations. See 6.1.4.6: "Vector Functions" in the doc.
The code in the last 4 lines is a signature: just render these lines
in POV-Ray and see ...
Sputnik
