When I try to use trace to place a tower from one of my include files
onto a heightfield island, I don't see the tower.  I put the tower onto
a plane representing water and It looked big enough to see over any part
of the island that might block it from view.  Am I using trace right? 
There is a picture in p.b.i.
Brendan

#declare xtrans = 500;	//where the tower goes
#declare ztrans = 0;

#declare Start = <xtrans,10000,ztrans>;		//trace to find y value for
tower
#declare Inter = 
trace ( Island, Start, <xtrans,-10000,ztrans>);

object { tower translate <xtrans,0,ztrans>+Inter*y }	//put tower there

cylinder { 0,<0,1000,0>,1 pigment { color rgb <0,0,1> } translate
<xtrans,0,ztrans> }	//shows where tower is

camera { location <1500,800,-917> look_at Inter/*+xtrans*x+ztrans*z*/ }
//camera { location <xtrans,10000,ztrans> look_at <xtrans,0,ztrans> }
//camera {  location <xtrans,400,ztrans> look_at
<xtrans,0,ztrans>+Inter*y translate <0,0,10> }

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