Spotted Rocks

Substance Designer practice. Render's done in Unity 5. Rocks are optimized down to 500-1000 triangles.

Fotoref's photopack has been used as a reference:

You can check some of my ideas on generating a procedural seam mask in this short youtube tutorial:
It's a relatively advanced tutorial but still could be useful.

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Real-time render of the sample scene from Unity 5

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Tiny tweaks in my Substance graph network allowed to generate a lot of variation in seconds.