3.2.1.3.4 Functions
"atan2(A,B): Arc-tangent of (A/B). Returns the angle, measured in
radians, whose tangent is (A/B). Returns appropriate value even if B is
zero. Use atan2(A,1) to compute usual atan(A) function."
Um... yeah, OK... so why does atan2(0, 0) give we a fatal parse error?
(POV-Ray v3.6, Windows.)
