Where is the mouse wheel mapping?

Hi folks,
i´m rebuilding my starting camera code, but cannot find the key function calls for the mouse wheel nowhere in the manual!
Those are the key mappings for mouse i found:
Mouse left: on_mouse_left, mouse_left
Mouse middle: on_mouse_middle, mouse_middle
Mouse right: on_mouse_right, mouse_right
There´s a 'mickey.z' mentioned, but doesn´t seen to work... is the way i´m accessing the variable, peraphs?

If there´s any other way of accessing mouse wheel functions, i´d appreciate any help. Thanks in advance.

mickey.z should be the number of notches you moved your mouse wheel in the last frame times 120.

This is how it should work:
follow_cam_distance+=some_factor*mickey.z;

And don't multiplicate it with time_step, because as it already measures the notches PER FRAME, it's already framerate independent. Multiplicating it with time_step only makes it framerate dependent again.

mickey

maybe you're not calling it in a while loop