Hello,

I've no experience in writing expressions but i want to make a wheel roll as i move a locator attached to it (the wheel parented to the locator and the locator's x translation drives the wheel's rotation.)

the translation is on the X axis.

For a wheel which has 0.5 unit for radius :

perimeter=2*3.1416*0.5=3.1416 units
So, 3.1416 is the distance to accomplish one round, 360°


Now, normally if the locator moves 1 unit on the x axis, the wheel should turn 360*1/3.1416=115°.

Am i right to do that ?