On 19/08/2017 07:04, 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.
> 


You are thinking about it wrongly.
There are no solid mesh objects. The keyword "hollow" has nothing to do 
with an object not being solid. It is used for media containers.
You should think in terms of the mesh not having any holes. Then you can 
use it with csg without artefacts. In the animation below I intersected 
the mesh of Ariel (the ghost) was intersected with a cub then filled 
with media. The hollow keyword was used for that.

http://www.tc-rtc.co.uk/member/imagenewdisplay/index176.html

When I was creating the df3s for Dhalgren with Thomas. I had a lot of 
trouble with the meshes when they had holes in them. (I had to manually 
edit the slices that make up the image sequence.)

http://news.povray.org/povray.binaries.images/thread/%3C58343a6a@news.povray.org%3E/



-- 

Regards
     Stephen

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