Andrew Christophersen shows how you can create a wheel rig in Maya that will work on all axis, by using world vectors instead of using single axis circumference math.
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a look at creating a simple automated rotating wheel in Maya, like the kind you would find in a quick and dirty car rig. Hector uses the distance tool to get an accurate measurement of the wheels that you are going to use, multiply the height of the wheel by 3.1416, and using that number for the translate of the Driver Object in a Set Driven Key
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