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feat(tabletop): add tilt and zStart/zEnd stacking options

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Replace the per-part lift with a local Y-axis tilt that fans the stack,
and add zStart/zEnd to ramp the stack's height across the curve so it
arches in 3D. Update the poker deck and docs accordingly.
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hypercross
2026-08-09 23:36:42 +08:00
parent 2da04940c2
commit c5d6dff12d
9 changed files with 127 additions and 28 deletions
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docs/bgm-tabletop.md
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@@ -40,7 +40,7 @@ the render map is per enabled surface: a piece may appear on more than one enabl
## 4. stacking
the format's stacking strategy (curve / limit / align / steps, see `bgm-format.md` §4) is implemented as a hook, e.g. `useStacking(route.stacking, index, stackSize)`, returning the offset/rotation to apply to a piece. `PartPlacement` consumes it.
the format's stacking strategy (`curve` / `limit` / `align` / `steps` / `tilt` / `zStart` / `zEnd`, see `bgm-format.md` §4) is implemented as a hook, e.g. `useStacking(route.stacking, index, stackSize)`, returning the offset/rotation to apply to a piece: `{ x, y, rotation, z, tilt }`. `x`/`y`/`rotation` come from the `curve`; `z` is the surface-normal height ramped from `zStart` to `zEnd`; `tilt` is the per-part fan about the card's local Y (long) axis. `PartPlacement` consumes it.
## 5. usage