Saving blank frames when rendering Fire

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Hello,

I'm working on an explosion flipbook. I thought I'd render the fire and the smoke separately. The smoke rendered fine. The fire comes out as a complete black image. I can't figure out what I'm doing wrong. I've tried EXR and TGA, both same thing, blank image. Could there be a setting in the shader doing it? The fire and the smoke are using two different materials. Any help would be greatly appreciated.

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Test.JPG (126.0 KB)

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I should also mention that the renders appear blank both in PS and in AE.

Thank you
Edited by ImNotJohnSmith - Jan. 23, 2019 22:08:55
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So it turns out, rendering the smoke I get alpha. Rendering the fire I don't. I thought that wasn't a problem but apparently if I don't have the smoke in the shader it won't render the fire. Why is that? Can I not just save the fire without an alpha channel?

It's intentionally gray so I can colour it in the engine.

Thank you
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