Function initThree

Returns {
    applyEdges: (root: Object3D) => void;
    camera: PerspectiveCamera;
    cameraController: CameraController;
    clearSelection: () => void;
    controls: OrbitControls;
    dispose: () => void;
    fitToView: () => void;
    gizmo: ViewGizmo | null;
    grid: Grid | null;
    measureTool: MeasureTool | null;
    renderer: WebGLRenderer;
    scene: Scene;
    setAmbientOcclusion: (enabled: boolean) => void;
    updateShadowBounds: () => void;
}

• applyEdges: (root: Object3D) => void

  Attach edge overlays to the meshes under root (no-op unless edges.enabled). Call after loading meshes via updateScene, since meshes arrive after init.

• camera: PerspectiveCamera

• cameraController: CameraController

• clearSelection: () => void

• controls: OrbitControls

• dispose: () => void

• fitToView: () => void

• gizmo: ViewGizmo | null

• grid: Grid | null

• measureTool: MeasureTool | null

  Two-click distance measurement tool. Null unless measure.enabled; setEnabled(true) to use.

• renderer: WebGLRenderer

• scene: Scene

• setAmbientOcclusion: (enabled: boolean) => void

  Toggle ambient occlusion at runtime — builds or tears down the postprocessing pipeline.

• updateShadowBounds: () => void

  Refit the sun's shadow frustum to the current scene content for crisp shadows. Call after loading or replacing geometry (e.g. after updateScene). No-op when sunlight/shadows are off.