Search for the bioluminecense thread here. There's all about the gather node and how to use it :)

I must say I think it's easier done with postwork .. but it could be cool with a glowing-water shader anyway :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.