Making flowmaps for Source

Valve¬†added Flowmaps in the L4D2 and later versions of Source. ¬†Valve used Houdini to create theirs, but most people don’t have access or experience in Houdini to create flow maps in the fashion that Valve did.

What is a flowmap?

A flowmap is a 2d texture that, according to colour values: scrolls the water normalmap over it, creating the effect of water “flowing”, hence the name flowmap.

This guide will teach you how to author your own flowmaps for Source, I am using the Portal 2 branch, but Alien Swarm, and CS:GO will work too.

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