I am very new and baffled. I am a 3d artist with an anim of rising smoke and I would like to have it fade as it rises. My sequence are png's and I haven't exactly found out the very basic of basics looking thru the threads. Photoshop doesn't want keep the proper alpha if i use a mask and of course, I have to do it to every frame. Trying to enter the modern age.
Also, having difficulties creating a proper loop. I have 3 sequences; 0-20, 20-40, 40-60, first opacity goes from 0-100% opacity, 40-60 goes from 100-0%. Works on a lot of anims but not rising smoke.
If the smoke in your image sequence is on an alpha channel, try this: animate a mask with a LOT of feather on it to fade out as the smoke rises. That's probably the easiest way.
As far as a loop goes, 60 frames isn't anywhere near enough to do a convincing loop of smoke rising. The stuff's just too darned random by its nature, so you need a lot more. If you say, "well, I have to do it in 60 frames, I have no other choice", then my reply is this: you will be creating something that absolutely screams, "THIS IS A LOOP"!
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