Can't seem to generate "heat" using pyrosourcepread?

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I'm using this tutorial from Entagma [www.youtube.com] to make spreading flames. But when I try to render in Redshift, the volume doesn't show up.


It seems like it has to do with the fact that “heat” isn't generated by the pyrosourcespread workflow, but it's needed for volume shading (according to various tutorials). I tried using “temperature” though I know that's wrong, and still nothing shows up.

Any ideas what I'm doing wrong? Thanks for help here.
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Heat was the naming convention used by pyro before Houdini 18. In Houdini 18+, the same field is called “flame”.
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