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I am using a fire simulation on a match in front of a green plane which I am hoping will act as a green screen so that I can composite it on top of a white background however I am now getting strange white artefacts showing up in the render. enter image description here

Thank you.

Butnik
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  • Please provide the Blender file, if possible.

    Question: Why are you not rendering this by using an alpha channel image file format instead of a green screen background?

     – Christoph Werner Jul 22 '20 at 15:51
  • Not an answer to the question, but a question to your methodology. You don't need green. Green is used when generating images on a camera, since you cannot generate alpha channels directly in the real world. But for CG you can generate the matte (alpha or transparency) directly. Why generate a background just to remove it later? – susu Jul 22 '20 at 18:09
  • I had trouble using the RGBA with my simulation as every time I did it would remove the fire. If you could talk me through how to get that to work then that would be just as good. Thank you. – Butnik Jul 23 '20 at 10:39
  • All you need is a transparent background and save as EXR https://blender.stackexchange.com/questions/42939/rendering-fire-animations-with-transparent-background and https://blender.stackexchange.com/questions/41574/render-semi-transparent-volume-with-cycles and this one too: https://blender.stackexchange.com/a/57824/92768 – susu Jul 23 '20 at 14:19
  • Oh ok, thank you, but just out of interest do you know why there are the strange lines? – Butnik Jul 23 '20 at 16:36

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