occlusionHiding property
Whether the surface's hosted subtree leaves the semantics tree while scene geometry occludes it from the camera. Defaults to false (an occluded surface keeps its semantics, matching a partially obscured widget). When true, an occlusion raycast toward the surface center each semantics update drops the whole subtree while it is hidden, so assistive technology cannot reach controls the viewer cannot see (matching how WidgetInput.automatic pointer input is already blocked by the occluder). Only consulted while assistive technology is active.
Implementation
final bool occlusionHiding;