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urbanir urbanir large scale urban scene inverse rendering from a single video 3dv 2025 chih hao lin 1 bohan liu 1 yi ting chen 2 kuan sheng chen 1 david forsyth 1 jia bin huang 2 anand bhattad 1 shenlong wang 1 1 university of illinois at urbana champaign 2 university of maryland college park paper code abstract we present urbanir urban scene inverse rendering a new inverse graphics model that enables realistic free viewpoint renderings of scenes under various lighting conditions with a single video it accurately infers shape albedo visibility and sun and sky illumination from wide baseline videos such as those from car mounted cameras differing from nerf s dense view settings in this context standard methods often yield subpar geometry and material estimates such as inaccurate roof representations and numerous floaters urbanir addresses these issues with novel losses that reduce errors in inverse graphics inference and rendering artifacts its techniques allow for precise shadow volume estimation in the original scene the model s outputs support controllable editing enabling photorealistic free viewpoint renderings of night simulations relit scenes and inserted objects marking a significant improvement over existing state of the art methods intrinsic decomposition please select different intrinsic components and compare with reconstruction left rendered from novel views component albedo depth normal shading semantic scene waymo 0 waymo 1 waymo 2 waymo 3 waymo 4 kitti 0 kitti 1 kitti 2 kitti 3 kitti 4 kitti 5 kitti 6 nighttime simulation by editing original illumination and inserting new light sources e g streetlights urbanir simulates nighttime videos left reconstruction right nighttime simulation scene waymo 0 waymo 1 waymo 2 waymo 3 waymo 4 kitti 0 kitti 1 kitti 2 kitti 3 kitti 4 relighting timelapse simulation by changing sunlight direction explicitly urbanir simulates sharp and geometry aware shadow left input image right timelapse simulation acknowledgements the website template was borrowed from michaël gharbi climatenerf refnerf nerfies climatenerf and semantic view synthesis