feat(wall): add endHeightOffset for sloped top edge

[vducasse]

What does this PR do?

Adds an endHeightOffset property to the WallNode schema to allow wall extremities to have different heights (e.g., for creating a knee wall following a single-pitch roof slope). This adds an "End height offset" slider to the wall properties panel and updates the geometry generation to apply the slope along the top edge of the wall.

How to test

1. Open a scene in the editor and draw a standard wall.
2. Select the wall to open the properties panel.
3. Under the dimensions/properties, look for the new End height offset slider.
4. Adjust the slider and verify that the top edge of the wall tilts smoothly between the start and end points.

Screenshots / screen recording

Checklist

• I've tested this locally with bun dev
• My code follows the existing code style (run bun check to verify)
• I've updated relevant documentation (if applicable)
• This PR targets the main branch

---

Note

Medium Risk
Touches core wall schema persistence and the main extrusion/CSG path; sloped tops may interact with face-band height logic and material assignment that still assume a flat effective height. Debug logging in the viewer path would spam the console on every rebuild until removed.

Overview
Adds optional endHeightOffset on walls so the top edge ramps from the start (unchanged) to a taller end—useful for knee walls along a single-pitch roof—without reshaping the plan footprint.

The wall schema documents and validates the field (non-negative, meters). The wall properties panel gets an End height offset slider (0–3 m, unit-aware) under the top dimensions. Extruded wall mesh generation applies applyWallEndHeightSlope after the standard extrude: vertices on the flat top at topY are raised along local X by a linear blend from 0 at start to endHeightOffset at end, before normals, material groups, and opening CSG.

Note: the new geometry helper still includes console.log debug output that should be removed before merge.

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[cursor]

Debug logs in slope helper

Medium Severity

applyWallEndHeightSlope still contains temporary console.log calls, including on the early-return path. generateExtrudedWall runs this for every wall rebuild (render and collision), so the console fills with debug output even when endHeightOffset is unset.

 

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 2 potential issues.

There are 3 total unresolved issues (including 1 from previous review).

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[cursor]

Curved walls warp sloped top

Medium Severity

applyWallEndHeightSlope drives the top height from chord-local X / wallLength, while curved footprints offset the two faces along arc normals. Those opposite-edge vertices get different local X values at the same station, so front and back tops rise by different amounts and the top surface warps whenever curveOffset and endHeightOffset are both set.

Additional Locations (1)

• packages/viewer/src/systems/wall/wall-system.tsx#L1051-L1052

 

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[cursor]

Placement height ignores end offset

Medium Severity

Geometry can extend above the flat wall top by endHeightOffset, but height helpers used for wall placement and overlays still resolve only the unsloped top. Near the taller end, wall-mounted items can be snapped or rejected as if the wall stopped at the original height even though the mesh continues higher.

Additional Locations (1)

• packages/viewer/src/systems/wall/wall-system.tsx#L1051-L1054

 

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