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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.

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  • $\begingroup$ 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? $\endgroup$ – Christoph Werner Jul 22 '20 at 15:51
  • $\begingroup$ 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? $\endgroup$ – susu Jul 22 '20 at 18:09
  • $\begingroup$ 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. $\endgroup$ – Butnik Jul 23 '20 at 10:39
  • $\begingroup$ All you need is a transparent background and save as EXR blender.stackexchange.com/questions/42939/… and blender.stackexchange.com/questions/41574/… and this one too: blender.stackexchange.com/a/57824/92768 $\endgroup$ – susu Jul 23 '20 at 14:19
  • $\begingroup$ Oh ok, thank you, but just out of interest do you know why there are the strange lines? $\endgroup$ – Butnik Jul 23 '20 at 16:36

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