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tiennm99bot/plans/journals/2026-10-02-gacha-glint-additive-blend-and-full-card-coverage.md
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tiennm99 2bb5108151 feat(renderer): deploy the renderer next to the bot in compose 
The bot now reaches the renderer at http://renderer:3000/api/gif on the
compose network instead of a separately deployed service. Both share
WHEELOFNAMES_API_TOKEN. CI runs the renderer's lint, typecheck, tests,
render smoke, and image build.
2026-10-03 11:16:54 +07:00

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title, date, summary
title date summary
Gacha glint: additive blend and full-card coverage 2026-10-02 Mirror glint now blends additively in the card's accent tone and sweeps every corner of the card

Gacha glint: additive blend and full-card coverage

What happened

  • The user asked for an additive blend on the gacha card's mirror glint. If that cost too much GPU, they wanted lower alpha and a colour that matches the card's tone instead.
  • They also noticed the glint did not cover the whole card.

Root cause (coverage)

  • .wish-glint was a card-sized box carrying a 135deg gradient, translated from (-100%,-100%) to (100%,100%).
  • A band only paints inside its own box, so as the box slid diagonally the top-right and bottom-left corners were never inside it at the moment the band passed. With a 63:88 card, the top-right corner sits about 5px outside the box when the band reaches it.

Changes

  • src/gacha/page/page.css:
    • The glint clip uses mix-blend-mode: plus-lighter.
    • Band and flare colours are tinted with --glint, the card accent, with peak alpha around 0.75.
    • The band box is now 300% of the card, centred on it, with gradient stops rescaled by 1/3. The flare width goes from 46% to 15.3%.
  • src/gacha/page/page.js:
    • --glint is set on the clip itself, because the card flies in an overlay outside #stage.
    • The sweep now runs from translate(-26.7%) to translate(26.7%), which is 0.8 card sizes each way.

Evidence

  • Docker render timings showed additive and normal blending within noise: 14.2s vs 14.4s and 11.6s vs 11.5s per clip. Headless Chrome composites in software here, and blending costs nothing measurable.
  • Frames at 3.8s (3-star) and 3.75s (5-star) show the band reaching the card edges, tinted blue and gold.

Next steps

  • The user reviews the fixtures before commit.

Historical work record — not durable authority. Prefer docs/specs/ADRs for current decisions.

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