I don't think so. It works when I replace isosurface with
box or sphere (and I think, that px and pz are declared locally
in macro). And it does not work when I replace them with
ax or az, as you wrote.

Which version od MegaPOV are you using? I use Linux version.

Fabien Mosen wrote:
> 
> The problem is due to the fact that you use the same variable
> names in the macro and in the loop.  This works :
> 
> #macro PlaceTree(ax, az)
>   #local Normal=<0, 0, 0>;
>   #local Where = trace(Landscape, <ax, 10, az>, <0, -1, 0>, Normal);
>   #if (Normal.x = 0 & Normal.y = 0 & Normal.z = 0)
>     #warning "Tree not placed\n"
>   #else
>     object {Tree translate Where}
>   #end
> #end

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