[Therion] How do you draw objects outside cave?

[Nikita Kozlov]

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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