If your Licht object is a light_source you should also add an Y offset to the
position.
Otherwise your light_source is located exacly on the Meeresgrund object, this could
cause some problems.

So here's the new code with an Y offset:

----------8<----------8<----------8<----------8<----------8<----------
#declare Normal=< 0.0, 0.0, 0.0 >;

#declare Angle=30.0;
#declare YOffset = 10;	// The lights are located YOffset
			// units above the Meeresgrund object

#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 + <0,YOffset,0> }
  declare Angle=Angle+30;
#end
----------8<----------8<----------8<----------8<----------8<----------


Joerg wrote:
> 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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