I think they tend to place a device for scale, then take multiple photos. That answers most questions, and they can recreate the scene/positions from those photos and videos.
I imagine some places are even doing 3D photogrammetric scans - digital scans of crime scenes that are automatically receated in a 3D model with accurate textures. This technology is after all already being used by game developers and other industries.
I wonder if they do use that, the aerosol would spray stuff around potentially contaminating other evidence.
I think they tend to place a device for scale, then take multiple photos. That answers most questions, and they can recreate the scene/positions from those photos and videos.
I imagine some places are even doing 3D photogrammetric scans - digital scans of crime scenes that are automatically receated in a 3D model with accurate textures. This technology is after all already being used by game developers and other industries.