On 19-8-2017 9:59, Thomas de Groot wrote:
> 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.
> 

After reading Clipka's answer below, you do not strictly need to do what 
I suggested in the first place but it can help to show the 
'subterranean' boundaries of the landscape mesh.

So, just make differences with any object you need: a cylinder for 
instance as a tunnel entrance.

-- 
Thomas

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