Procedural Texturing with RGBA Mask for Rock - UE4 -

For an envrionment project, I choose to use a RGB mask texturing workflow my rock. This workflow is efficient to texture a large amount of rock, is very iteration friendly, and well optimised for Real Time because the texture used are General Texture ( except for a normal map ) that can be used on other assets.
The textures are tilling depending on the asset size to keep a pixel density consistent between all the rocks, even if they are rescaled. The shader can be easily expended, for example by adding a new mask on the alpha channel of the rgb mask.

Rocks were sculpted and decimated in Zbrush.