i dont know how to create an expression for controlling the rotation by values.
ie, if iam creating two objects nurbscircle and polycube.
and adding a boolean attribute to nurbscircle. Through which i want to control the rotation y attribute of polyCube.
The polyCube has to rotate in y-axis from `0 to 70` and it has to return to `70 to 0 to -70`
it has to loop its rotation between 70 to -70
and if i switch "off" the attribute in circle, it has to stop.
can any one help me out to do this