hdri 360 panorama view in empty modern hall on top floor near panoramic windows with columns, staircase and doors in full

360 hall panorama hdri panoramic windows hdr staircase degree room emergency exit empty equirectangular spherical seamless modern top floor columns doors area balustrade building evacuation business comfortable corridor stairs shelter enter entrance ladder extinguisher foyer handrail indoor inside interior space level long studio vestibule view full projection may use environment map