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It should work like this:
----------8<----------8<----------8<----------8<----------8<----------
#declare Normal=< 0.0, 0.0, 0.0 >;
#declare Angle=30.0;
#while(Angle<360)
#declare Location=< -25.0, 100.0, 0.0 > rotate < 0.0, Angle, 0.0 >;
#declare LPos=trace( Meeresgrund, Location, -y, Normal );
object {Licht translate LPos }
declare Angle=Angle+30;
#end
----------8<----------8<----------8<----------8<----------8<----------
Sven Littkowski wrote:
> Here a sample of my scene:
>
> #declare Normal=< 0.0, 0.0, 0.0 >;
>
> #declare Angle=30.0;
>
> #while(Angle<360)
> #declare Location=< -25.0, 100.0, 0.0 > rotate < 0.0, Angle, 0.0 >;
> #declare Boden=trace( Meeresgrund, Location, -y, Normal );
> object {Licht translate < -25.0, Boden.y, 0.0 > rotate < 0.0, Angle, 0.0
> > }
> declare Angle=Angle+30;
> #end
>
> I intent to place some objects (called "Licht") in a circle. Since the
> underground is a height_field, I want to use Trace to get the proper Y
> coordinate of the current location. There I fail. I don't know exactly, how
> to properly define the location for Trace. Please see above. of course, that
> returns an error message. How to do it better?
>
> Thanks,
>
> Sven
>
>
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