fix(registry): enable alpha blending on the DotField material - #127
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Included review availability: 9 reviews are currently available. Based on recent review activity, included reviews refill at 10 per hour. 📝 WalkthroughWalkthroughThe DotField shader now uses the dot mask as alpha and enables transparency. A development probe and Playwright test validate stacking over a warm gradient. Poster generation and display support per-poster capture dimensions, including 2048×1280 for DotField. ChangesDotField stacking and poster output
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR enables correct alpha blending for stacked DotField rendering and updates its poster background handling; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant VisualTest
participant ProbePage
participant ShaderScene
participant DotField
VisualTest->>ProbePage: Load stacking probe
ProbePage->>ShaderScene: Render ProbeScene
ShaderScene->>DotField: Render white dots over warm gradient
DotField-->>VisualTest: Return rendered canvas
VisualTest->>VisualTest: Analyze gradient visibility and dot coverage
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
In `@registry/dot-field/shader.tsx`:
- Around line 157-158: Update the DotField material setup to enable
premultiplied alpha and adjust colorNode so only the RGB channels are
premultiplied by dotMask, while preserving dotMask as the alpha channel.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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apps/docs-tests/visual/dot-field-stack.spec.tsapps/docs/src/app/dev/dot-field-stack-probe/page.dev.tsxapps/docs/src/app/dev/dot-field-stack-probe/probe-scene.tsxregistry/dot-field/shader.tsx
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Why
Stacked over another layer in one ShaderScene, DotField overwrote everything beneath it: its material never opted into alpha blending, so the GPU ignored the fragment alpha carrying the dot mask (MAT-93). The solo demo hid this because the transparent canvas let DOM compositing do the blending instead.
What changes
Alpha blending on the DotField material
Same fix as Blobs:
material.transparent = true. The colorNode also stops premultiplying the color by the dot mask, since the blend already multiplies by alpha and doing both darkens the anti-aliased rim twice. Solo rendering is unchanged and the existing dot-field-default baseline passes as-is.A stacked probe and spec
/dev/dot-field-stack-probestacks DotField over a bright gradient, and a new spec asserts color fractions on the canvas instead of comparing a screenshot, so there is no baseline to regenerate and the check doesn't depend on which backend rendered it. Against the unfixed material it fails with a gradient fraction of 0.Pixel-locked poster
The dot-field poster never matched the live shader. Its transparent gaps flattened to pure black instead of the demo page's
#0a0a14(fixed with the build script's background field, as aurora and god-rays already do), andobjectFit: coverrescaled the capture to the demo box even though DotField sizes its grid in real CSS pixels, so the dot pitch was wrong at every box width except the capture's own. The poster now renders at its exact capture size, centered and cropped by the box (pixelSizeon DemoPoster), the same way the shader anchors its grid. Measured poster-vs-shader pitch agrees within 0.4% at a 2x viewport.Summary by CodeRabbit
Bug Fixes
Tests
Development Tools
Improvements