Elephant Toy

                                                                        Wheel Rig
        
               The task was to rig the wheels of the elephant toy to turn when the model was moved.
                                                              
                                                                      State of rest

                                    

                                                                      Stretched position

 

                                                                   Squashed position

For this rig to work, an expression was required. Therefore a formula was used to make the wheels turn when the model was moved.

An auto wheel attribute was added to the master control of the model to control the on and off of the wheel movement.

Individual controls for each of the four wheels were created for individual movement.

Then a squash deformer was added to the model for the stretch and squash feature to get a  cartoonic  appeal.

The whole model was then parent and scale constrained to the master control.