[baxuz]

Not everything can be represented by textured meshes used in traditional photogrammetry (think Google Street View)

This includes sparse areas like fences, vegetation and the likes, but more importantly any material properties like reflections, specularity, opacity, etc.

Here's a few great examples: https://superspl.at/view?id=cf6ac78e

https://superspl.at/view?id=c67edb74