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I am having an issue with rendering fire on a transparent background. I've gone into the world and changed the alpha from the sky to transparency. I've checked the transparent box under the render properties, under the film section. However, when I do this only my emitter renders, not my fire simulation. Unchecking the box under the film section causes renders to return to normal. Any help would be appreciated. Wondering if something is setup incorrectly with my nodes? Or If I am missing some setting.

Thanks!

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Louis Rubera
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  • Can you add a screenshot? – Crantisz Jan 25 '18 at 06:33
  • Renders at 10% Added – Louis Rubera Jan 25 '18 at 06:42
  • Can you upload the file? You can use https://blend-exchange.giantcowfilms.com/ for this. – Crantisz Jan 25 '18 at 06:48
  • Added Thanks Crantisz! I mostly followed a tutorial as I don't quite understand all the settings yet. – Louis Rubera Jan 25 '18 at 06:51
  • I saw that, but it isn't a viewer only issue, renders aren't correct. Also, whereas that post has the fire still visible, although not displaying correctly. Mine has nothing except the emitter displaying. – Louis Rubera Jan 25 '18 at 07:13
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    It's exactly your question. The only difference is that your fire visible because you have non-transparency emitter behind it – Crantisz Jan 25 '18 at 08:00
  • What does make you think renders aren't correct? Did you try overlaying rendered image over some solid color to check? Note also that render output should be saved to OpenEXR to allow correct work with transparency – Mr Zak Jan 25 '18 at 10:18
  • Yeah, I've overlayed it on a solid color and there is nothing other than the emitter showing up, not so much as one particle of fire. ;) I've tried saving as both exr and a png with rgba turned on. – Louis Rubera Jan 25 '18 at 20:03
  • Perhaps, I am not reading the article right? I can't use a blue or green screen because it doesn't key nicely with the fire element. What other options do I have? – Louis Rubera Jan 30 '18 at 21:53

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