When you create a shelf-tool Pyro effect such as “billowy smoke” where is the shader? According to the help docs on http://www.sidefx.com/docs/houdini12.0/nodes/shop/pyro [sidefx.com] it says that “ (The tools on the Pyro FX shelf tab apply customized Pyro materials to the simulations they create with the proper settings already turned on.) ”

However the shop network is empty when I looked, so it's not really clear to me where it is. Kind of a noob question, but any help here would be appreciated. Thanks!

inside shops, just hit tab and then type pyro. if youre using the shelf tools they will create the shader inside the shop context

The billowy smoke tool doesn't create a shader for you…

You can add a Billowy Smoke shader to the smoke from the Gallery in the Material pane or dive in to /shop in network view and tab-type add a pyro shader as zdimaria mentioned above for much more control.

You may have to turn off the rendering of any fire elements as the temperature field can be mapped in to the fire component of the shaders.