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34 lines
1.9 KiB
Markdown
34 lines
1.9 KiB
Markdown
---
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title: "Gacha glint: additive blend and full-card coverage"
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date: 2026-10-02
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summary: "Mirror glint now blends additively in the card's accent tone and sweeps every corner of the card"
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---
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# Gacha glint: additive blend and full-card coverage
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## What happened
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- 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.
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- They also noticed the glint did not cover the whole card.
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## Root cause (coverage)
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- `.wish-glint` was a card-sized box carrying a 135deg gradient, translated from (-100%,-100%) to (100%,100%).
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- 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.
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## Changes
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- `src/gacha/page/page.css`:
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- The glint clip uses `mix-blend-mode: plus-lighter`.
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- Band and flare colours are tinted with `--glint`, the card accent, with peak alpha around 0.75.
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- 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%.
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- `src/gacha/page/page.js`:
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- `--glint` is set on the clip itself, because the card flies in an overlay outside #stage.
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- The sweep now runs from translate(-26.7%) to translate(26.7%), which is 0.8 card sizes each way.
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## Evidence
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- 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.
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- Frames at 3.8s (3-star) and 3.75s (5-star) show the band reaching the card edges, tinted blue and gold.
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## Next steps
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- The user reviews the fixtures before commit.
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> Historical work record — not durable authority. Prefer docs/specs/ADRs for current decisions.
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