Procedural shading in VRay RT GPU using a new method showed by Grant Warwick in his latest shading webinar.

The model made by Hadrien Ledieu does not have any UVs and it's textured using triplanar mapping and David Gruwier "Surface Imperfections Pack".

Raw render

Update - 01

Added procedural dust layers and a little bit of post in Photoshop to reduce some of the noise.

Update - 02

Testing on photogrammetry environment I've captured and different lights.