>
> Like I said, this example PNG is very simple, 2 colors indeed.
> But I have others with many colors, more complicated shapes, not so easy to
> separate colors/shapes.
> Also, heightfield does not produce the quality I need, I used them a long time
> ago and they are not very smooth and sharp.
>
>

You can increase the resolution of the image used in the height_field to 
get smoother edges. Also, slightly bluring the inage used can help in 
this case.
To have sharper results, scale the hight_field verticaly by something 
like 100 (scale<1,100,1>), and clip it using a box of the desired height 
in an intersection.

Alain

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