It seems to me that the edges are too sharp and height fields are not 
designed to handle properly slopes like these, so you see lots of 
artefacts on the sides of the bricks. You can try to have smoother 
slopes on the sides.

Your other problem with the surface of bricks is not very obvious, you 
might try to increase the resolution of your height field, sometimes, 
especially when doing a zoom on a height field you need to go up to 
resolutions like 7000x7000 ...

I hope it helps,

JC

Xilo Musimene wrote:
> Here's a wall, made out of a height field...  eventually it will be much 
> nicier...
> 
> The height field was rendered in povray as a 1024^2 hf_grey_16 bit png.
> 
> There is a pigment { rgb 1} and no reflection, the height field is 
> smooth, and there are no subsequent normals applied...
> 
> I wonder where the problem comes from...
> Here a glimpse of the code:
> 
> height_field { png "BrickWall01.png" smooth
>  scale <1,0.1,1>
>  [...]
> }
> 
> 
> ------------------------------------------------------------------------
>

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