A direction vector that cannot be normalized, such as [0,0,0], will cause the rotation to not be applied.
<rotate3d()> = rotate3d( <number> , <number> , <number> , [ <angle> | <zero> ] )
An integer or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits. The first character may be preceded by a sign (- or +). The last character may be succeeded by an exponent (e or E) and an integer.
A number with a unit: deg (360 degrees in a full circle), grad (400 gradians in a full circle), rad (2π radians in a full circle), or turn (1 turn in a full circle).
Represents a literal number with the value 0.