Jonathan Rafael Ghiglia wrote:
> 
> During the rendering of this image I got several "Illegal grid value in
> dda_traversal()".
> What's wrong? Is that connected with my hf bricks? How can I fix it?

see:
http://www.students.tut.fi/~warp/povVFAQ/miscVFAQ.html#ddatraversal

> Besides I'd like to know the best way to make realistic bricks
> (displaced isosurfaces?...).
> 

Your heightfield bricks look good, isosurfaces could be useful too, but
they are much slower when you use pigment functions.  What's best is not
easy to say, it depends on the actual situation.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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