Buy some more memory or another computer ...  :-)

Apart from smooth keyword and using a higher resolution hf image, I 
don't see anything else.

Depending on the shape you want (btw, I couldn't read attached image) 
you can also try isosurfaces with adequate noise3D + f_granite for 
example. It takes more time to render but uses less memory. It's also 
perfectly smooth whatever the resolution.

JC


> As you can see it, this part of height-field is a bit too much
> pixellised (we see big squares on the slopes). Unfortunately, when I use
> a better defined grayscale image, I don't have enough memory to render
> it.
> Does someone have an idea ?
> 

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