Animated/evolving Volume Fog
Posted 12 March 2014 - 12:25 AM
maybe a simple question, but I've been banging my head over this. How do you animate the fog in a volume fog node. When I mean animate, I don't mean translating the fog in x,y,z, I'm trying to have the fog evolve. I have a fast noise piped into the volume fog with a high seethe rate, but that is there to change the aspect of the fog, and doesn't affect how the fog would evolve. I thought maybe I could animate the first time slice, but that basically pops from one frame to another.
I feel like I'm just a click away..or at least should be by now. Any tips?
Posted 12 March 2014 - 04:50 AM
didnt know how to make it more clear with my english maybe u have a sample comp?
Posted 12 March 2014 - 10:27 AM
Posted 12 March 2014 - 10:40 AM
You would then need to cycle the volume so that the Seeth is Expression = "math.floor(time/100)*x" where x is your desired seething rate.
It would be nice if VolumeFog supported something like AT's Quilt format, where you encode all the Z slices into one ginormous image. Fusion easily handles 32K images, and could sort of handle even larger (ever make a 3D LUT with very high precision?). The Quilt has metadata that allows you to know what the XYZ sizes and aspects are, so you wouldn't need a UI change to VolumeFog, either.
Posted 12 March 2014 - 11:13 AM
My only concern now is that since the look of the fog is based on the seethe rate ( high detailed fog= high seethe rate), if I want the fog to evolve nice and slowly, I need a lower seethe rate, which then lowers the detail the fog. Is there a way to counter that effect?
Posted 12 March 2014 - 04:27 PM
Hmm... Actually looking at the tool, they don't have a Z transform built in, so I guess Seethe is the Z. But that doesn't give you anything to actually animated the volume with. Sorry, I've used VolumeFog a lot, but never with FN.
Maybe try Darktree?
Posted 12 March 2014 - 05:21 PM
Posted 12 March 2014 - 05:37 PM
EDIT: Yeah, that's exactly what it is. Check out FastNoiseTexture to see what I mean.
I'm pretty sure this is simplex noise, which can be higher dimensionality, but only a 3D implementation is available in FastNoise.
So yeah, either use Darktree, some other noise generator, or make a 4D noise fuse. What kind of animation were you hoping to see?
Posted 12 March 2014 - 10:28 PM
As far as the look, I just have some fast noise node node with discontinuous/inverted noise merged creating some interesting "stringy" fog I would love to get evolving somewhat. It's for a full cg show, so not realistic or matching footage. Thanks for pointing me in the right direction!
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