With my original trace, it put the tower at zero distance above the
water plane.  So, it was hidden under the heightfield.  Changing the
third argument of trace to -y worked.  I used str to convert the float
Inter.y to a string that #debug can output.  Thanks.
Brendan

>   At first look it seems correct to me. Why not try "debug" to print out
> the actual value of Inter.y? That could help you to figure where the
> tower is going...
>

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