Cuts, seams and motion

Here is one scene change done three ways, laid out the way a reviewer checks it: frames a tenth of a second apart, either side of the cut.

The dead cut shows identical frames on both sides of the cut. The crossfade shows a grey frame that belongs to neither shot. The cut on motion just looks like one card throwing to the next. That last one is the craft of this lesson.

Films cut, and that is fine

A hard cut is an instant jump from one shot to the next. 26 of Skale's 29 films and 14 of the 18 acclaimed films hard-cut. Banning cuts forces every film into a continuous morph, which only five of the 47 chose.

How often a film cuts belongs to its register. Pick one below and feel the difference.

An even rhythm is a metronome. The films that feel alive vary it, and many end a run on an accelerating ladder: figma-launch cuts nine times on holds shrinking .8, .5, .4, .3, .2, .15, .12, .1 s, then lands on a hold.

The two cuts that always fail

1. The dead cut

   A settled frame, then a scene that waits. The outgoing shot is not moving on the cut frame, and the incoming one does nothing for more than ~0.3-0.4 s. The film stalls.

2. The crossfade dip

   Both scenes fade at once, so at the midpoint whatever is underneath shows through: the page's white, a different background. Fade through a ground both scenes share, or cut.

A crossfade is not banned. 11 of 29 Skale films dissolve or dip (0.45 s median). Adaline dips to its paper colour; Extend dips through its brand colour. Those pass because the ground is shared.

Where the eye accepts a cut

A good cut lands where the eye is already going. The measured places:

• On the click. Linear Agent clears the input on Enter, cuts 0.7 s later to the prompt already posted.
• On a constant ground. Keep one world or layout and cut freely; Raycast cuts 9 times in 28 s.
• On the element being read. A 2-3× scale jump of the same thing, anchored so it lands where it really sits.
• Into motion. Cut mid-drift on a moving camera, or onto things already travelling.
• Inside a fill. The Gemini app hides all four of its cuts in full-frame glyph fills.
• To a still frame that acts within a beat (0.3-0.4 s).

Seams: what carries the eye

A seam is any scene change, cut or not. It reads as one move when the outgoing element is still travelling on the last frame and the incoming one carries on: same axis, same direction, matched speed.

One current per film. Pick one dominant direction (leftward is a common default) and spend the others on purpose: up for a conclusion, a pull back for an arrival.

The thing that crosses is the carrier. Use 2-3 seam types per film, one of them for 60-70 % of the changes.

Motion inside a shot

Inside a shot, things arrive on a fast exponential settle and leave on the mirror curve. The speed of a settle is its time constant: about 0.1-0.15 s for an object, slower for long travel (Raycast's big crane ~0.43 s, counters 0.6-0.8 s).

• Nothing decorative moves on UI. No float, pulse or breathe. A slow camera creep under a hold is fine.
• Overshoot is a register, not a default: only 4 of 29 Skale films and 3 of 18 acclaimed show visible bounce. Never spring a camera.
• Blur is a choice. Velocity blur peaks around 10 px on text, 18-20 px on full-frame surfaces. Plenty of films whip completely sharp.
• Decisions are stamped, not tweened. A typed letter, a selection hop, a page swap happens in one frame.
• A cause launches its effect. Click, squash, release, impact. That is what makes a film feel lively, not bounce.

Plan every scene change before animating. For each seam write one row:
type (cut / match-cut / morph), what exits and what enters, axis and
direction. Rules: no dead cuts (one side always moving, or the new shot
acts within 0.3-0.4 s); no crossfade between two opaque scenes unless
they share a ground; one dominant direction for ordinary seams; 2-3
seam types, one primary. Inside shots: exponential settles (tau
0.1-0.15 s for objects), nothing decorative moving on UI, no spring on
the camera.