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Text animators: Tracking Amount in pixels, Subtract selectors stop at 0, as After Effects

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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>
This commit is contained in:
vangel76
2026-10-19 16:41:15 +02:00
co-authored by Claude Opus 5.5
parent 83b134cdc8
commit 8ea876914d
6 changed files with 55 additions and 11 deletions
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docs/fidelity/README.md
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@@ -90,6 +90,18 @@ Regression test: `rtl_point_text_with_a_justified_paragraph_is_flush_at_its_star
AE wraps right-to-left box text slightly wider (its word gaps are 1–2 px narrower than in
left-to-right text with the same font), so a 300 px box fits a word more per line.
## Text animator tracking
Measured on 19 October 2026 with After Effects 2026 (26.2): a text animator's Tracking Amount is in
pixels, not 1/1000 em like the Character panel's tracking (Amount 30 adds 30 px between neighbouring
characters at 80 px and at 40 px, half before and half after each), and a Subtract range selector
over characters the first selector leaves out keeps them at 0 instead of tracking them negatively.
With both, the EXPORTER's t8 layer D (Tracking 30 on characters 2–4 by index, a Subtract selector
over the last 20 %) puts every glyph where AE does (it ended 88 px short). The "Tracking In" text
preset now animates 40 → 0 px (was 400 → 0 thousandths of an em); Lottie export writes a style run's
tracking as pixels. Regression tests: `animator_tracking_is_in_pixels_as_in_after_effects`,
`modes_combine`.
## Still unmeasured
Rendered frame comparisons now have a deterministic `effectcraft_effects::fidelity::compare_frames`