Recently there has been discussion in the groups:

http://news.povray.org/povray.text.scene-files/thread/%3C5cee3441%40news.povray.org%3E/

and

http://news.povray.org/povray.binaries.images/thread/%3C3fccdbcf%40news.povray.org%3E/

regarding the creation of a isosurface brick wall. It's something I've 
worked on now and again over the years. Somewhere I could not find I 
have a version which creates a long stone path following terrain.

I started to throw some things together from an isosurface spiral 
example I could find - and got much further than I expected.

Attached is a scene file and an image representing what I think one 
decent general approach in v3.8 for creating many similar shapes in an 
isosurface where each can use unique local coordinates for 
noise/patterns shapes and texturing.

Bill P.

Aside: Isosurfaces in these situations will often generate max gradient 
warnings we just ignore so long as things look good.

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Attachments:
Download 'v38brickwallisomethod.pov.txt' (5 KB) Download 'v38brickwallisomethod.png' (752 KB)

Preview of image 'v38brickwallisomethod.png'