I want to do this. But i'm unable to find any decent and explainable tutorial on how to do a thing like this: http://www.youtube.com/watch?v=DAkKKShGluE

Can someone explain how you go on about doing this or give a tutorial that accually make sens.

Here's a tutorial on world portals and toxic water:

http://www.google.com/url?sa=tsource=w ... j2yw1yaYHQ

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