Spatial properties move along their path by arc length: a table of 96 chords per segment,
read back by linear interpolation of the curve parameter. Within each cell that mapping is
linear, so the speed (the Graph Editor's speed graph, a central difference of the
position) jumped at every cell boundary and was off by up to ~2 % on a curved path: a
sawtooth over a constant-speed move, and a slight wobble in the motion itself.
The table now holds Gauss-Legendre arc lengths, and `at_length` refines the cell's linear
guess with Newton steps on the true arc length (|B'(u)| as the derivative), so position and
speed follow the path exactly.
Test: linear keys along a strongly curved path give a constant speed (within 0.1 %) at
every sample; the old mapping was off by 2 %.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QiAJeFttZp83Fh7YuzAR5f
The Ease Presets panel (#254) is modelled on a third-party panel, so,
as with third-party tools in After Effects, it isn't core any more: it
is `extensions/scriptui-panels/Ease Presets.jsx`, a ScriptUI panel
bundled as an optional extension (Window ▸ Ease Presets.jsx), written
only against the public scripting API. Clicking a preset eases every
pair of neighbouring selected keyframes in one undo step (per
dimension, along the motion path for spatial properties, the keys'
other sides as they play); the fields edit the working curve, which the
panel draws; From Keys, Save, Rename and Delete as before. The twelve
built-in curves are unchanged.
Scripting API fixes it needed (After Effects parity):
- `app.settings` lasts between runs (`script_settings.json` in the
settings folder; `script.settings.get` / `script.settings.save`).
- Per-key methods (`setTemporalEaseAtKey`, `setInterpolationTypeAtKey`,
`removeKey`, the continuous / auto-Bezier / roving setters) no longer
change the user's key selection (they selected the key they edited).
- `keyInTemporalEase` / `keyOutTemporalEase` report linear and
auto-Bezier sides as they play, `keyIn/OutSpatialTangent` the
tangents the motion path plays.
- `selectedProperties` includes the properties of selected keyframes.
- `isInterpolationTypeValid` is false for Linear / Bezier on values that
only hold.
Removed from core: Window ▸ Ease Presets, the `keys.easePreset.*`
commands, `engine::ease_presets` and the `ease_presets.json` store,
`keyframe::EaseCurve` (nothing else used it) and the egui panel. User
presets saved by the v0.6.0 panel move into the panel's app.settings
section the first time settings load (the old file is left as is).
Docs: plugins.md (bundled extensions), parity.md, gaps.md G8, agents.md.
Test: app_settings_last_between_runs,
per_key_methods_keep_the_key_selection_and_report_eases_as_they_play,
spatial_tangents_are_reported_as_the_path_plays (each fails before),
the_ease_presets_panel_eases_every_selected_pair_in_one_undo_step,
a_typed_curve_scales_to_each_dimension_and_follows_motion_paths,
user_presets_save_rename_delete_and_persist,
presets_saved_by_the_old_core_panel_carry_over (script, through the
panel's controls), ease_presets_panel_eases_the_selected_keys_from_its_list
(UI: the panel docks and a click on a preset eases the keys).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The Position motion path drew a key's spatial handles only where its
tangent wasn't zero, and auto-Bezier keys have none at the path's ends,
so a two-key path (the usual start) had no handles to pull it into a
curve. Auto-Bezier keys now show a handle on such a side too, pointing
where the path leaves the key, a third of the way to the next key;
dragging it makes the key Bezier with that tangent. Linear keys still
show none.
Keyframe Interpolation > Spatial Bezier copied those zero tangents, so
the keys stayed straight with no handles (and read back as Linear); it
now gives them the same handles. The path keeps its shape and timing.
The handles come from the new keyframe::spatial_handles.
Tests: spatial_bezier_gives_a_straight_path_handles (engine),
a_straight_motion_path_has_handles_to_curve_it (ui_viewer).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An EaseCurve is the temporal ease of one segment independent of its
duration and values: the out side of the first key and the in side of
the second, as influence (%) and speed relative to the segment's
average speed (1 = linear, 0 = at rest). Its handles in the normalised
value graph are cubic-bezier points. apply() eases a pair of keys per
dimension, along the motion path for spatial values and as overall
progress for paths and gradients, the way Easy Ease shapes them; an
Auto Bezier key keeps its other side as it plays. measure() reads the
curve a segment plays back. Non-finite numbers are rejected and
influences and speeds clamped.
Test: handles_round_trip_and_reject_non_finite_numbers,
applied_curve_scales_to_each_dimension_and_measures_back,
spatial_curve_follows_the_motion_path,
linear_and_auto_bezier_sides_measure_as_they_play (effectcraft-keyframe).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 2232354b902238827b2e80a29ef266c2e5bde272)
(cherry picked from commit 95da7943454ca5b2575993d11f9ba046822ce255)
segment_value treated any non-Linear in-side of the next key as Bezier,
so a key set to Hold (KeyframeInterpolationType.HOLD, add_keyframe
"interpolation": "hold", or the Keyframe Interpolation dialog, which set
both sides) turned the linear segment into it into an ease-in with the
default ease: 0 -> 100 over 2 s read 27.0 instead of 25 at 0.5 s. Hold
only affects what follows the key, which the out side already handles.
The Graph Editor and the Lottie exporter already treat a Hold in-side as
linear, so exports didn't match the preview either.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
CharStyle/TextDoc variations (layer.setText variations), shaped with harfrust instances so
advances follow HVAR/gvar, outlines drawn at the design-space position, animator deltas relative
to the style's values, Character panel Variable Font Axes fields (character.axis.<tag>).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Reconciled with main's keyframe labels (same Keyframe::label field; keys.setLabel and
keys.selectLabelGroup from main are kept, M14.5's duplicates removed; Edit ▸ Label on
selected keys delegates to the label helper), proxies (RenderOpts::proxy next to
nested_switches/draft_shadows), offloaded renders (Work carries nested_switches), wasm
audio pump (preview mix rate), variable font axes and mask feather points.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Text: vertical type turns Roman characters on their side (CJK stays
upright) unless Standard Vertical Roman Alignment is on; Tate-Chu-Yoko sets
selected characters horizontally in a one-em cell of the column (layer.setText
tateChuYoko / verticalRomanUpright, Character panel toggles). A Left-to-Right
paragraph is now forced LTR instead of auto-detected. The editing caret follows
animators and text on a path (render::text::caret_maps). Lottie export writes
per-character style runs as index-unit range animators.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Interface: Timeline outline columns wider than the pane scroll horizontally
(Shift+wheel/trackpad, scroll bar above the footer; headers clipped); the
Project panel's optional columns scroll under the frozen Name/Label columns.
ANM-1: keyframe colour labels (keys.setLabel, Label submenu, tinted key
icons) and Edit > Select Keyframe Label Group on selected/all layers and
visible keyframes (keys.selectLabelGroup replaces the stub). Alt-drag time
scaling of key groups already existed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Shapes (SHP-2): Stroke Taper (pixels/percent start/end length, width, ease) and
Wave (amount, pixels/cycles, wavelength, phase) rendered as a variable-width
outline; Dash 2/Gap 2/Dash 3/Gap 3 (shape.dashes.add/remove, timeline +/-
buttons); radial gradient Highlight Length/Angle as a focal gradient.
Masks (MSK-1): mask feather points on the Mask Path (mask.featherPoint.*,
Mask Feather tool add/drag), per-point signed radius and tension, rendered
from the signed distance to the path; carried through vertex edits.
Motion blur (LYR-10): Adaptive Sample Limit comp setting; 2D layers take one
sample per pixel of shutter travel between Samples Per Frame and the limit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
TextDoc gains character style runs (font, size, colours, tracking, leading,
baseline shift, h/v scale, tsume, faux styles, caps, super/subscript, kerning
metrics/optical/manual, ligatures) and per-paragraph settings (justification
with last-line modes, indents, space before/after, direction, composer,
hanging punctuation), serde-compatible with single-style documents. Layout
handles mixed runs on a line (shared baseline, largest leading), every-line
composer, editing geometry (carets, hit testing, selection quads) and basic
vertical type. Renderer colours per run. Expressions get the sourceText style
API (style, getStyleAt, createStyle, setters with character ranges).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Engine (all commands with undo/redo + tests in engine/src/tests_timeline.rs):
- keys.copy/paste (Edit Copy/Cut/Paste route to keys when keys are selected;
relative timing kept, paste at CTI, cross-property paste of same type),
keys.selectAll (Cmd+Alt+A), keys.nudge* (Alt+Arrow, Alt+Shift+Arrow),
keys.set / keys.setEase (graph editor drags), keys.info (dialog data),
keys.timeReverse; keys.interpolation gains continuous/auto Bezier, spatial
interpolation and roving; keys.velocity takes per-dimension values and
Continuous.
- Roving keys (keyframe::retime_roving): constant speed along the motion path.
- Layer > Time: layer.timeStretch (percent|duration, hold in/current/out),
layer.timeReverse (Cmd+Alt+R), layer.enableTimeRemap (Cmd+Alt+T),
layer.freezeFrame, layer.freezeOnLastFrame; render uses Time Remap as the
source time for precomp/footage layers.
- prop.separateDimensions (X/Y/Z Position; prop.set on Position writes them).
- layer.setParent compensates so the layer stays in place (compensate:false
to opt out).
- prop.pickWhip writes AE-style reference expressions (thisComp.layer(..),
effect(..)(..), mask(..).maskFeather, temp=…;[temp,temp], …[0]).
- prop.setExpression: syntax errors keep the text but disable the expression.
- expr: arrays of properties returned by an expression are resolved.
UI: Keyframe Velocity, Keyframe Interpolation and Time Stretch dialogs;
Graph Editor (value + speed graphs, draggable keys and Bezier/influence
handles, auto-zoom, fit, show selected, separate dimensions, hold/linear/
auto Bezier/Easy Ease buttons); key + layer context menus. Clears the
workspace clippy -D warnings failures.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude
MarekSpodBiedry
bflatastic
Brandon Thomas
Dexter
storybored379