Interesting. Blobs are obviously the best way to go in terms of render time. 
The difference between 2 and 3 shows a difference of weathering which could 
be initiated - in the real world - by a difference in material strength or 
resilience, and/or chemical weathering vs frost weathering. For instance, 
weathering 2 could represent a (chemically) weathered limestone while 
weathering 3 would be a frost-bitten granite or metamorph sandstone. THere 
are a lot of possibilities with your technique.

Thomas

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