Visual Effects in Stop Motion
Stop motion animation is a unique form of an animation in that it often requires visual
effects to be complete. Puppets are posed and then shot in a series of still photographs
that create the illusion of movement. Animators often use rigs to suspend the puppet or
a prop in mid-air, green screens are used to add in a background or to break a scene
into more manageable chunks and, particularly for Wapos Bay, fire and water are added
digitally for a more realistic look. VFX are also often used to clean up, repair or change
the animation all together if the director changes his or her mind later in the editing
room.
The first clip demonstrates a number of techniques. Residual flicker, an artifact from the
lenses, needed to be removed on many of the shots in After Effects using GenArtʼs
Sapphire plug-in. The green screens needed to be pulled in After Effects and replaced
with background photographs. And, of course, Andrew Doll, our VFX supervisor and
lead VFX artist, had to replace the light bulb with a time travel portal (that Bryan
MacCallum created in Particle Illusion) and lightning that was hand drawn in After
Effects.
The second clip is quite a bit more complex. Once again, there is some flicker removal
and keying out of green screens but there is added debris when the truck crashes
through the fence. A box is added to the back of the ATV to maintain continuity with the
next shot and dust particles are added digitally as well.
The crane shot over the truck was more difficult because it also includes camera
movement. The highway had to be cloned and extended to the horizon along with the
trees and ditch. Camera movement is added to subsequent shots to simulate the
movement of the truck and green screens replaced with trees whizzing by. A plate of
the exterminators on the ATV is warped to fit into the mirror of the truck. Rigs are used
extensively in the fight on top of the truck and the truckʼs subsequent crash and needed
to be painted out in After Effects (along with adding more dust and debris to enhance
the effect).
The exterminator vision was created with a colour and text overlay accompanied by
rotoscoping and camera tracking to outline Jacob (again all in After Effects). Rig
removal and the time portal and lightning complete the scene. In the final shots, the
flicker was actually left in and enhanced as it accentuated the lightning quite nicely.
Courtesy John Thronberg, Post Production Supervisor











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