> Sorry...
>

You may be able to use the cells pattern scalled to the dimention of 
your bricks, along with some repeating and offset warp, to get some 
random displacement of the front of individual bricks, as well as some 
variations of the shape of each faces.
You'll need to use two patterns, one "naked" cells pattern to move the 
bricks slightly in and out, and one using a texture_map for the surfaces 
shape variations.

Try first with only some pigments and normals to get the feel of it.

As for the mortar, it's probable that you can get away with a simple box 
placed just inside of the isosurface face. A simple pigment and normal 
should be enough.
If you want to go all isosurface, a simple planar one with sone high 
frequency noise added will do. As almost all of it will be invisible, 
you can use very low settings for the precision and to low max_gradient, 
making it faster.


Alain

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