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Underwater fog effect with VRAY, how? :/
show user profile  maddog2002
ok guys, look at this CGTalk thread...

you see that image, with the shark?... notice how under the water there's a fog effect?... with volumetric caustics in it and all?... and the fog effect is delimited by the water so that above water there is no fog?...

now... how the heck could i go about creating such an underwater effect with vray, or brazil... like this guy who used brazil?

anyone care to shed some light on this subject for me?... it will be greately apreciated =)

thnx in advance =)

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7/7/2006 10:08:33 AM (last edit: 7/7/2006 10:08:33 AM)
show user profile  kleutscher
i used this tut once and got a similar result with vray only is this tut scanline. maybe its no help but there are some usefull tips in it. and then some particles for the floating debree.

But do you think I'll ever get a job at Pixar? That's one of my goals in life.

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7/7/2006 10:33:56 AM (last edit: 7/7/2006 10:35:54 AM)
show user profile  jayb
hey maddawg

LOL "shed some light on this subject"
i dont know a lot about anything but could u not distort ur vray mats reflections in the water and bore through some vol light its obviously very complicated would love to see ur development with this

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7/7/2006 10:59:07 AM (last edit: 7/7/2006 10:59:07 AM)
show user profile  maddog2002
yes thnx guys =)

the thing i am looking for is that phenomenon of the underwater fog delimited by the water... u know, camera above water crispy clear, underwater foggy sea split scene effect... i know i could do something like this in post using masks and effects, but isn't there some kind of shader or effect that can do this directly at rendertime?...


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7/7/2006 1:06:27 PM (last edit: 7/7/2006 1:06:27 PM)
show user profile  Manolo
For a still frame it's not difficult; for animation well, that changes everything. Let's explore...


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7/7/2006 3:26:51 PM (last edit: 7/7/2006 3:26:51 PM)
show user profile  killerbee2
make sure your water is a closed object and apply fog in your vraymaterial as a start

read 3774 times
7/7/2006 5:49:29 PM (last edit: 7/7/2006 5:49:29 PM)
show user profile  droogenbrother
May be he did not do the "whole" image in one render..(unless this vray as renderer can composite two differnt types of renders) it says he used photoshop and combustion both of which have compositing features, maybe he composited two different renders and composited them and adjust the interlacing or something like that (or colors even) i dunno . sounds cool though LOL :)
Providence protects children and idiots. I know because I have tested it.

- Mark Twain

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7/8/2006 1:26:07 AM (last edit: 7/8/2006 1:26:07 AM)
show user profile  Bobbyboy
I think droogenbrother might be right on the mark. Looks to me like he used 4 different layers. one for the sky, one for the shark, one for the top of the water and then another for the under water fog. With the light rays and what not painted in photoshop. Or atleast thats probably the way i would do it.
Either way, it's a very nice image! :)

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7/8/2006 1:56:16 AM (last edit: 7/8/2006 1:56:16 AM)
show user profile  Vim
I'm actually just starting to think about this for a project im working on (underwater dino, the mosasaur). To really get the effect it seems like you gotta really just go all out. Especially, as mentioned, if you want to animate or explore multiple cameras.

It'll probably be a major issue on my plate next week so it would be cool share ideas and progress in this thread. I'm using mental ray and maya in this case, however, so things are obviously different. There's the whole photon marching physical approach, we'll see how well that works out.

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7/8/2006 2:26:53 AM (last edit: 7/8/2006 2:26:53 AM)
show user profile  maddog2002
i know this guy used masks, zdepth and some other techniques to accomplish the effect... it is actualy pretty easy... but not as acurate...

that's why i am asking if there's a shader or something that can do this at rendertime...

Killerbee is right, the fog setting in the vray material achieves the effect, i was doing some tests... and it actualy looks good, but you would have to "cheat" and not realy go inside the water, but render from one side of the (solid) water body... as soon as you go inside the water body the fog goes away...

and besides this, you need volume caustics, and to cast caustics on objects inside the water body...

i read somewhere that some pretty amazing underwater scenes with volume caustics and all were made with vray... but, im beggining to think they developed their own shaders for this... gotta research more heh...

thnx very much guys... any more input is greately apreciated =)

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7/8/2006 9:46:00 AM (last edit: 7/8/2006 9:46:00 AM)
show user profile  jonnybravo_87
*adds thread to favourites
actualy i was realy wondering how the guy got that look too. I'm mostly interested on the caustics and the underwater efect.....i searched up a lot of tuts on the net and i never managed to find something as good as this :/......i'm glad you brought it up maddog and i'm sorry that i cant help.... White Death

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7/8/2006 11:22:27 AM (last edit: 7/8/2006 11:22:27 AM)
show user profile  nexgirl
im not sure but i was looking at the tutorials on 3dmax and they made a under water project and they added fog. and it turned out really cool, here is the link.
itson issue 2, sixth one down, hope it helps if not sorry.

I Live To Model!

read 3709 times
7/8/2006 11:49:28 AM (last edit: 7/8/2006 11:49:28 AM)
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