Animator

What they do

An animator is assigned shots, usually a few seconds each, with a layout camera, a rigged character, an audio track, and a note about what the scene is about. The work goes through named stages. Blocking sets the storytelling poses on stepped keys, so the shot reads as a series of held attitudes with no in-betweens; this is what goes to the director first, because it is the cheapest point at which the acting can be rejected. Spline converts those keys to interpolated curves and the shot starts moving, usually badly, and the animator spends the next pass fixing the arcs and timing the interpolation destroyed. Polish is contact, overlap, follow-through, eye darts, blinks, finger offsets, and cleaning the graph editor curves so nothing pops. Dailies punctuate all of it: the shot is screened, the director gives notes, and the animator does another version. In a feature the same animator may spend three weeks on four seconds of dialogue. In VFX the shot arrives with a tracked plate camera and live-action performance already in frame, so animation has to match a real light direction and a real contact with real ground. Alongside hero work sits crowd animation, which is cycles, variation and simulation rather than individual performance.

What they decide

The calls that belong to this role and no other.

• What the character is thinking in each beat, and therefore which poses exist at all
• The timing and spacing: where the keys land and how the character accelerates between them
• Which poses are storytelling poses and which are transitional, subject to the director's notes
• How much the performance deviates from the boards and the reference, proposed in dailies
• Whether a piece of business is acted or achieved with a rig cheat, and where the cheat is hidden
• How much of a shot is thrown out after a note rather than patched

Principles of the craft

• Weight is timing, not mass: nothing in a CG character has weight, so the audience infers it entirely from how long things take and how the character resists gravity. A heavy character does not move more slowly, it accelerates more slowly and settles later. Get the acceleration wrong and no amount of secondary detail will fix the read.
• Contrast in spacing is what makes motion alive: even spacing reads as machinery. Real movement crowds keys around the slow parts and thins them out through the fast ones, so a fast action across the frame can be two drawings and a hold. Look at your curves as spacing, not as shapes.
• Break the joints to keep the arcs: a limb that rotates rigidly around its pivots travels in straight lines and dead angles. Offsetting and softening the chain so the hand leads and the elbow trails buys the curved path the eye expects, which is why animators build rigs' bendy controls into their workflow rather than fighting them.
• Act from a thought, not from a pose library: decide what the character wants and what they realise in this shot, then find the pose that says it. Reaching for a pose you have used before produces a competent shot that means nothing, and directors can feel the difference without being able to name it.
• Blocking is where the shot is judged, and it should be brutal: stepped keys with no interpolation force you to defend the poses on their own. If the acting does not read in eight held poses, splining it will only hide the problem under motion.

Common mistakes

• Splining too early, because moving mush looks more finished than clear stepped keys and hides the fact that the acting has not been decided.
• Animating the dialogue rather than the thought: mouth shapes and gesticulation on every word, with no moment where the character is listening or deciding.
• Uniform, floaty timing with no held poses and no contrast, which reads as underwater no matter how many details are added.
• Ignoring the camera: a performance keyed while orbiting freely, that turns out to play off-axis or off-screen in the layout camera.
• The competent animator's mistake: over-polishing. Endless overlap and secondary motion piled onto a shot whose core idea was never clear, which reads as busy rather than alive.

How to learn it

Exercises and routes in, not a reading list.

• Animate a bouncing ball, then the same ball as a bowling ball and a beach ball, with identical start and end frames and no scale change. Only timing and spacing may differ. Show all three to someone and ask which is heaviest.
• Shoot yourself acting a five-second line on a phone, then animate it in Blender without looking at the video again after blocking. Compare at the end. The differences are your habits, and they are more useful than the reference.
• Block a shot in eight stepped poses and screen it with the sound off to three people. If they cannot tell you what the character wants, do not spline it. Reblock.
• Work through the Khan Academy Pixar in a Box animation unit for the maths of interpolation, then go into the graph editor on a finished shot of yours and read the curves as spacing. Flatten one curve deliberately and watch the life leave the motion.
• Take a walk cycle and produce three versions of the same character: confident, exhausted, and hiding something, using the same footfall frames. Only the upper body and timing between contacts may change.