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fix(tabletop): tilt cards uniformly about the y axis

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Apply the same tilt to every stacked part and rotate it about its local
Y axis instead of Z. Default tilt to 1 degree when a stacking strategy
is present, and arc the poker deck along the surface's bottom edge.
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hypercross
2026-08-10 00:23:08 +08:00
parent b312bf4f1f
commit 43c6334413
7 changed files with 23 additions and 23 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` / `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.
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 rotation about the card's local Y (long) axis, applied to every part. `PartPlacement` consumes it.
## 5. usage