How To Render Fire With Transparency In Blender

The Blender Made Easy channel shows a Blender Compositor trick for how to render fire with transparency.

In this new tutorial from the Blender Made Easy Channel, you’ll learn a trick for getting fire in blender to render with transparency. Adding an opacity to a flame simulation can be more complicated than it sounds! The video explains how one goes about creating and simulating their fires then shows us step by step instructions on rendering out what we want–a beautiful stack of burning logs or ontoasting pizzas ready at last…

In order to render realistic fire effects, one needs only a few simple tools. For example the compositor allows us mask out where flames should be and use their alpha channel for lighting purposes.”

https://youtube.com/watch?v=wNnFfXxB2Dg