here is sample swift code to calculation the room corners:
let dim = wall.dimensions
let t = wall.transform
let pos = simd_float3(x: t.columns.3.x, y: t.columns.3.y, z: t.columns.3.z)
let right = simd_float3(x: t.columns.0.x, y: t.columns.0.y, z: t.columns.0.z)
let up = simd_float3(x: t.columns.1.x, y: t.columns.1.y, z: t.columns.1.z)
let end0 = pos - right * dim.x / 2 - up * dim.y / 2
let end1 = pos + right * dim.x / 2 + up * dim.y / 2
Gavin-Jiang
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