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Following the camera look-at broke when zoomed out (fixed ±50 frustum too small to cover the scene) and when zoomed into an empty corner (frustum centred on nothing). Instead, fit the directional light's ortho shadow camera to the building: union the registered scene-node bounds (excluding the site/ground plane), fit a sphere, and size + place the shadow camera to cover that sphere plus a margin. Bounds are refreshed on a short interval since they only change while editing. Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>