Iray Render video question


https://forum.reallusion.com/Topic408044.aspx
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By will2power71 - 5 Years Ago
I was watching the Iray render preview video. About 18 seconds in, there's a scene with a knight swinging a sword. In the background there's a torch burning. I was wondering if this effect was a popcornfx effect or was it achieved some other way? Can anyone shed some light on how it was done? It would really be nice if there was support for popcornfx but I'll settle for being able to do a campfire or a torch with Iray in some fashion. This is the video I was referring to. 

[YouTube]https://www.youtube.com/watch?time_continue=20&v=-Yhy-YMnQYc[/YouTube]