On 19-8-2017 8:04, Sven Littkowski wrote:
> Intention:
> 
> Using the "Difference" function to create caves and tunnels inside a
> square-shaped piece of Martian surface (a hollow mesh object).
> 
> What are your solutions, to transfer what is now a mesh, into a solid
> object. I believe these objects need to be solid, in order to create
> caves and tunnels through Difference into that body.
> 

Once thing you can do is an intersection with a slightly smaller box in 
the horizontal directions, and as deep as you want downward. This 
creates the subterranean world.

-- 
Thomas

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