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Cycles can now render smoke and fire simulation but for compositing need, I want the illumination pass from the fire. The aim is to composite this pass with a tracked footage.

I already try with the diffuse indirect pass but there is the ground plane with it so it's hard without alpha to get a proper image.

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One solution is to add a material index to your fire's material, and then, on the compositor, you can take the Emission pass, and multiply it with the Object Index one.

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Go to the Properties panel, then switch to the Materials tab, and under the Settings subsection, change the material index.

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Then, still on the Properties panel, switch to the Render Layers tab, go to the Passes subsection and activate Material Index and Emission.

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Then, in the compositor, multiply the output of a IDMask set to 1 and the Emission pass.

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