With per-character 3D on, After Effects turns each character by Rx * Ry * Rz
(Z first), as it turns a 3D layer's X / Y / Z Rotation (case 931, AE 2026:
"H" at 400 px with animator X / Y / Z Rotation 40 / 30 / 20). EffectCraft
composed Rz * Ry * Rx, so the glyph faced another way: 23 of 5184 grid
points off (max 255), now 3 at the anti-aliased edge (mean 0.015/255). The
same order fix-orientation uses for layers; texts with one rotation axis
are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A text animator's Tracking Amount is in pixels in After Effects 2026, not in
1/1000 em like the Character panel's tracking: Amount 30 on every character
adds 30 px between neighbours (half before, half after each) at 80 px and at
40 px. And a Subtract range selector over characters the first selector
leaves out keeps them at 0 instead of selecting them negatively. With both,
the EXPORTER's t8 layer D (Tracking 30 on characters 2-4 by index, Subtract
over the last 20 %) puts every glyph where AE does (it ended 88 px short,
1553 vs 1641; now 1641).
The "Tracking In" text preset animates 40 -> 0 px (was 400 -> 0 thousandths
of an em, about the same at 100 px text); Lottie export writes a style run's
tracking (1/1000 em) as pixels for its tracking animator, which Lottie
players add in pixels.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
After Effects 2026 lays out right-to-left point text whose paragraph carries a
justified code (justify last left / centre / right, justify all) flush at
its start, the right, like right-aligned text (EXPORTER read-back t7: point
rows with codes 3-6 at -152..-8 from the anchor). EffectCraft placed it by
the last-line side (left / centre / left). Left-to-right point text and box
text are unchanged; AE's slightly wider right-to-left box wrapping (1-2 px
narrower word gaps) stays open.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
With Justify All After Effects stretches the paragraph's last line too, and
its every-line composer breaks the paragraph so that line is not a lone
word: a 400 px box that the other justifications break into 6 / 6 / 1 words
breaks 4 / 4 / 4 (AE 2026, EXPORTER read-back t6). EffectCraft's composer
left the last line's slack out of its cost, so "twelve" stood alone on a
stretched line; it now counts that slack for Justify All and every word
starts within 1 px of AE's (what remains in that box is the known box-text
baseline offset). Other justifications and the single-line composer are
unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
After Effects draws a Rectangle Path clockwise from its top-right corner, or
with round corners from the end of the top-right arc on the right edge;
Trim Paths measures from there (AE 2026, case 930: 400 x 300 rectangles,
Trim 0-25 % and 70 / 30). EffectCraft built the path with kurbo, starting at
the top-left corner, so trimmed rectangles drew another segment: case 930
was 86 of 5184 grid points off (max 255), now 5 at stroke edges. Start > End
was already drawn swapped, as in AE. Convert to Bezier now gives AE's vertex
order (top-right first); the engine test follows. Lottie rectangles share
the path and now start where lottie players start them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Problem: Object Matte had no After Effects comparison, and none can be made
on this Linux machine (no After Effects). The gap notes still listed the
viewer tool, background job and disk cache as missing.
Fix: docs/fidelity/object-matte.md states plainly that nothing is measured
yet and pins down the comparison for when an After Effects 26.2+ reference
is available: four original or openly licensed clips (the synthetic moving
disk from the engine tests, the disk with a jump, two objects with a box
prompt, one CC0/CC BY real clip), the prompt and settings, where reference
mattes stay (gitignored), and the metrics: per-frame IoU against After
Effects (headline), IoU against ground truth, boundary distance, soft-edge
error, temporal stability, drift and time per frame, plus a proposed pass
bar left to the maintainers. Linked from docs/fidelity/README.md.
docs/gaps.md (#14) and docs/target-app-parity.md now list what landed and
leave the comparison as the one remaining item.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Measured against After Effects 26.3 with the original
examples/ae-spatial-tangents.jsx (three paths, ten keys, even and uneven
timing): an auto-Bezier key's out tangent is (next - previous) / 6 and
the in tangent its mirror, whatever the key times; an end key uses its
one neighbour, (neighbour - key) / 6. EffectCraft gave end keys none and
scaled middle tangents by segment length, so paths with auto-Bezier keys
ran up to 28 px from AE's. All ten tangents now match; path samples are
within 0.05 px.
Tests that relied on end keys having no tangent now expect AE's: Spatial
Bezier keeps auto keys' handles (linear keys still get a third), the
motion-path handle is drawn at a sixth, and a straight loopOut path is
compared within 1e-9. docs/fidelity records the method and scores.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
