Imagine to use DistoX, survey shot and several splay shots, the new piece of cave will be added and you only add objects as blocks, flowstone, decorations, water, ...
https://www.youtube.com/watch?v=ZzJotdH ... ETE0jq-OaF
there should be 8 videos
list of "symbols"
https://forums.unrealengine.com/showthr ... ve-package
Source
http://unrealengine.com/marketplace/luo ... ocks-caves
m.