Bumping the puppet
Gently bumping or flicking the puppet before taking the frame will produce a slight blur, however care must be taken when doing this that the puppet does not move too much or that one does not bump or move props or set pieces.
Moving the table
Moving the table the model is standing on while the film is being exposed creates a slight, realistic blur. This technique was used by Aardman animation for the train chase in The Wrong Trousers and again during the lorry chase in A Close Shave. In both cases the cameras were moved physically during a 1-2 second exposure. The technique was revived for the full-length Wallace and Gromit: The Curse of the Were-Rabbit.
Go motion
The most sophisticated technique was originally developed for the film The Empire Strikes Back and used for some shots of the tauntauns; a more advanced and was later used on films like Dragonslayer and is quite different from traditional stop motion. The model is essentially a rod puppet. The rods are attached to motors which are linked to a computer that can record the movements as the model is traditionally animated. When enough movements have been made, the model is reset to its original position, the camera rolls and the model is moved across the table. Because the model is moving during shots, motion blur is created.
A variation of go motion was used in E.T. the Extra-Terrestrial to partially animate the children on their bicycles.
Go motion today
Go motion was originally planned to be used extensively for the dinosaurs in Jurassic Park, until Steven Spielberg decided to try out the swiftly developing techniques of computer-generated imagery instead.
Today, the mechanical method of achieving motion blur using go motion is rarely used, as it is more complicated, slow, and labor intensive than computer generated effects. However, the motion blurring technique still has potential in real stop motion movies where the puppet's motions are supposed to be somewhat realistic. Motion blurring can now be digitally done as a post production process using special effects software such as After Effects, Boris FX, Combustion, and other similar special effects commercial software.
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