[pierotofy]

Photogrammetry struggles with certain types of materials (e.g. reflective surfaces). It's also very difficult to capture fine details (thin structures, hair). 3DGS is very good at that. And people are working on improving current shortcomings, including methods to extract meshes that we could use in traditional graphics pipelines.

[somethingsome]

3DGS is absolutely not good with non Lambertian materials..

After testing it, if fails in very basic cases. And it is normal that it fails, non Lambertian materials are not reconstructed correctly with SfM methods.

[andybak]

I don't understand the connection you're making between SfM (Structure from Motion) and surface shading.

I might be misunderstanding what you're trying to say. Could you elaborate?