This tutorial goes through the basics of creating your own custom nel channels. There are so many uses for this but in this example I show you how to create a custom channel based on the intersection of two objects and then use it to control both velocity and viscosity. This is the same basic principle of how I created my heat setup (vimeo.com/43727857) but it's just the tip of the iceberg. Also, you can export all custom channels to either Houdini or Max (when you import using Krakatoa). If you got any questions, post them below. Here are the tutorial nel files:

tobbeo.net/CustomChannelTutorial_beginning.ni
tobbeo.net/CustomChannelTutorial_complete.ni

Edit: It seems you need at least 0.6.1.43 to do this tutorial. Attempting the same thing in 0.6.070 and earlier will crash Naiad when creating the Particle-Nel-Channel based on the mask.

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