> I finally got around to this. Thanks!
> 
> I don't quite understand the code yet. A few questions:
> 
> 1. How do I make it so that the probability is lower depending on the



> 2. The spikes seem to point in the direction of the normal. Can I

> 3. Is there a way to round the y coordinate to the nearest 8 units and


> 
> Thanks again!
> 
> 
> Michael
> 
> 
For the spikes. You just need to ignore the normal returned by the trace 
function when placing them.
So, remove any vrotate or vorient.

For the rounding... I would try using the modulo function.
Something like this :
#declare LEGO_Position = <Position.x-mod(Position.x, 10), 
Position.y-mod(Position.y, 8), Position.z-mod(Position.z, 10)>

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