Native SceneKit CIELAB viewer. Fix spec 18 §10 traps; do not clone them.
docs/18-gamut-viewer.md (all), 23-assets.md. #179 #185 #112 #225.
In: .gam parser, SceneKit scene, sRGB overlay, controls. Out: Metal rewrite, Three.js port, WebGL at boot.
.gam
Parser: two CGATS BEGIN_DATA blocks — vertices VERTEX_NO L a b (discard index, push-order), then faces 0-based concatenated. Strip # comments incl. inline. Non-numeric/arity/plausibility/empty-file warnings. Native faces > convex hull. Vertex-only → hull fallback (dedup by coord key). ASCII only. Scene: X=a* ±128, Y=L* 0–100, Z=b* ±128. Camera home (180,120,180) lookAt (0,50,0), orbit + damping. Axis scaffold at (0,50,0). Profile mesh vertex colours Lab→sRGB (D50→D65 Bradford, γ, clamp) opacity 0.88 double-sided. sRGB reference = bundled REAL sRGB.gam (issue 3), faint fill + edge outline ~15°. Controls: visibility + opacity per layer; R resets camera on a focusable container. Load on Stage 5 entry + post-verify. Do not allocate the scene at app launch. Fix, do not replicate: opacity-inference bug, label-visibility bug, dead keybinding (doc 18 §10).
BEGIN_DATA
VERTEX_NO L a b
#
sRGB.gam
#179 dual-table + (a,L,b) layout. #185 axes/edges/vertex-colour. #112 density stays 10 (producer). #225 no 3D at boot.
Blocks-on: 3 (asset), 24 (.gam). Unblocks: none.
window
No dependencies set.
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Summary
Native SceneKit CIELAB viewer. Fix spec 18 §10 traps; do not clone them.
Spec refs
docs/18-gamut-viewer.md (all), 23-assets.md. #179 #185 #112 #225.
Scope
In:
.gamparser, SceneKit scene, sRGB overlay, controls.Out: Metal rewrite, Three.js port, WebGL at boot.
Implementation notes
Parser: two CGATS
BEGIN_DATAblocks — verticesVERTEX_NO L a b(discard index, push-order), then faces 0-based concatenated. Strip#comments incl. inline. Non-numeric/arity/plausibility/empty-file warnings. Native faces > convex hull. Vertex-only → hull fallback (dedup by coord key). ASCII only.Scene: X=a* ±128, Y=L* 0–100, Z=b* ±128. Camera home (180,120,180) lookAt (0,50,0), orbit + damping.
Axis scaffold at (0,50,0). Profile mesh vertex colours Lab→sRGB (D50→D65 Bradford, γ, clamp) opacity 0.88 double-sided.
sRGB reference = bundled REAL
sRGB.gam(issue 3), faint fill + edge outline ~15°.Controls: visibility + opacity per layer; R resets camera on a focusable container.
Load on Stage 5 entry + post-verify. Do not allocate the scene at app launch.
Fix, do not replicate: opacity-inference bug, label-visibility bug, dead keybinding (doc 18 §10).
Rewrite invariants
#179 dual-table + (a,L,b) layout. #185 axes/edges/vertex-colour. #112 density stays 10 (producer). #225 no 3D at boot.
Dependencies
Blocks-on: 3 (asset), 24 (
.gam).Unblocks: none.
Test
windowat module load — #212 class).Acceptance criteria