On the object use the option

-clip off

I think it is accessible through right click  but have not checked

Andrew

On 8 Jan 2016 4:21 p.m., "Nikita Kozlov" <nikita.kozlov@gmail.com> wrote:
Hi everyone!

What trick can be used to draw cave objects like rivers, trees outside actual cave like here:
http://www.thailandcaves.shepton.org.uk/files/cavesurveys/chumphon/cp0054-tham-than-nam-lot-noi.png
(a piece of river near Resurgence entrance)

Drawing invisible walls did not help me. My rivers always gets cut by line connecting entrance sides. 

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