CAD robot animation and toon shading with mental ray

Did the 3D for this project. The robot was CAD data imported and cleaned with Maya. 
The shading was done with mental ray. Arnold didn´t have  any outline shader back in the time. 
The wheels were rigged individually, since the robot locomotion is quite special, where each wheel can rotate in its own speed to turn the robot. 
The wheels were just key animated for each shot. 



more here: 



the complete animation: