Stefan Viljoen
> 
> object 
> {
>         Ground 
>         rotate <90,0,45>
>         translate <50,-20,0>
> }
> 
> #declare loc = trace(Ground,<0,0,5>,-z);
> 
> sphere
> {
>         <0,0,0>,0.25 
>         translate loc
> }

What did you expect this to result in?  If you think the sphere will be 
placed on the surface of the object you obviously have misunderstood 
something about how transforms work.  You will either have to remove the 
"rotate <90,0,45> translate <50,-20,0>" from the object or add it to the 
sphere as well.

Christoph

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