How to apply the Photoshop CS3 Radial-Blur-Effect to 3D objects (or objects that are not “flat”).

Its well established that if you want to make a car’s wheels seem as if they are in motion, you apply the Radial Blur effect. However this does not work as well if the wheels are in perspective because the car was shot in an angle. Here is what to do to work your magic on wheels that are at an...