A timed Set sound FX parameters ran only linearly, and a Lerp had four
quadratic eases of its own. An animation key already had the full set.
Now all three offer the same choice: Linear, Step, the ten curves from
Sine to Bounce with In, Out or In-out, and a drawn Curve asset.
- easingParams in src/core/graph/nodes/easing.ts gives a node the
fields Easing, Direction and Curve from the key's own lists, and
easingOfParams reads them back as a key interpolation.
- There is no migration. A Lerp saved with the old in, out or inOut
runs linear until its easing is picked again.
- Set sound FX parameters hands the easing to the player. Linear and
Step stay ramps of the audio clock, every other easing goes to
setValueCurveAtTime as 200 samples a second, in semitones and dB.
- Step now reaches its end at t 1. A key never asked for that, it
reads the next key itself, so animations play as before.
- The curve-in-use count and the warning for a gone curve cover the
sound node too.
Tests:
- node-catalog: Lerp with cubic in, quad out and in-out, a curve
without a direction, step, an unknown easing as linear. The sound
node hands on a curve, step and a gone curve as linear.
- sound-library: an eased change becomes a curve in semitones and
decibels, a step a jump at the end.
- node-catalog and curve after dropping the old values: 399, green.
- e2e 6, 34, 53 on melektaus-atx: ALL PASSED, 198 checks. In Chrome a
2 s Quad in from depth 7 to -5 read speed 0.864 early and 0.5 at the
end, a 1 s Step held 1 and then jumped to 0.5.
- Counter-check: with curves sent as linear ramps, the curve test of
the sound library fails.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The built-in eases cover the usual shapes, but a game often wants its
own: a coin that bounces twice, a door that overshoots and settles.
A new asset type holds such a curve, and keys and the Lerp node can
pick it instead of a built-in ease.
- New asset type "curve": points like in Vector art, x is t and y is
the value. A new curve is the straight line from (0, 0) to (1, 1).
- One pure evaluation in src/core/model/curve.ts serves the timeline
preview, the running game and the Lerp node.
- The curve always has one value per t. The end points stay at t 0
and 1, points cannot pass each other, and a handle that reaches past
its neighbour is shortened along its direction. Loading a hand-edited
file applies the same rules.
- Curve tab: click on the line to insert a point that keeps the shape,
click on free space to put one there, drag points and handles,
double-click or Delete removes, Alt-click toggles round and sharp.
Every step is one undo step.
- Presets: all 30 built-in eases plus Linear, fitted with adaptive
subdivision. Each stays within 0.4 % of the built-in ease.
- Preview: a dot runs along the curve once a second, a second dot
shows only the value. The Preview button stops it.
- Animation keys get "Curve" under Easing with a curve picker. Lerp
gets "Curve" under Ease, and its result may overshoot b.
- A missing or unpicked curve runs linear. The inspector says so, the
node shows it as a problem, and deleting a used curve warns with the
number of keys and Lerp nodes.
Tests:
- ./check.sh: 180 files, 2612 tests, CHECK EXIT 0
- GM_STEPS=1-6,25,53: ALL PASSED, 309 checks
- New e2e module 53 with 13 checks, all with the real mouse. Expected
values come from its own Bezier evaluation.
- Counter-checks bite: without Bezier evaluation 4 unit tests fail,
without handle clamping 2. In the browser, a key that cannot find its
curve, a click that sets no point and a handle drag that moves the
point all turn checks red.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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