RFAQ:Animation - wheels of a car

Q: Anyone has idea how to animate the wheels in a car (the car drive along the road and the wheels rotate) in 3DS 4?

A: A little mathematics:

Create the wheels, link to the car.You know the Radius, so you can calculate the Lenght of a wheel:

L=2 x Pi x Radius

Now let's say we are going to measure time in frames (F) To have realtime, use F=30 for NTSC or F=25 for PAL.
Let's say the speed of your car should be L/F Move to frame F and rotate the wheel at 360 degrees. On the same frame, move the car L units forward.
(An european example: if L=100 3DS units = 1 m, F=25=1 second, then your car is moving with 1 m/s. (3,6 km/h) You can calculate a speed of 60 km/h into m/sec and then use the result for L...)

You can Repeat the Rotation of the wheel at frame F using KeyInfo, and move the car as far as you want having the following in mind: To move the car N x L units you have to go to frame N x F.

This will synchronize the linear movement of the car with the rotation of the wheels.