This animation illustrates various stages of upgrading Level 3 model to fully textured Level 4 model. Level 3 model was captured using aerial stereo photogrammetry, facade detail and textures were captured using terrestrial photogrammetry. Final animation & renders were produced in Unreal Engine 4.
As the animation shows, there is no silver bullet automated technology to create this level of digital twin of the as-built environment. Hours of 3D modelling by highly trained people are still required but the top quality – only few years ago reserved for large AAA studios – can now be achieved within realistic time frames and budgets.