atan vex function

Contexts: chop , cop , displace , fog , image3d , light , photon , pop , shadow , sop , surface

Tags: math

Returns the arc-tangent of the argument.

1. float atan(float )

2. vector atan(vector )

3. vector4 atan(vector4 )

4. float atan(float y, float x)

   Same as atan2.

Returns the arc-tangent of the argument. The return value is in the range -pi/2 to pi/2.