Should I Use Fluid To Make Fog?

[richie-hsu]

I build a bamboo forest.I want to add fog on it.should I use fluid?or I should use plug-ins or I should make fog in AE?Rendering of fluid is so slow...

guys,Please give me some suggestions.

it is a scene of a short animation.

[ptb]

depends. If the fog is animated then use fluids, if it's static, use environment fog or mental ray volume shader.

[richie-hsu]

unfortunately,it is animated.....

Is there any setting to optimize the fluid ?

[anuradha-jayathilaka]

QUOTE(saltyfish @ 06/28/08, 10:39 AM) [snapback]287606[/snapback]
unfortunately,it is animated.....

Is there any setting to optimize the fluid ?

i think using fluids will take a lot of time to render.
did you try rendering a depth map and applying the fog in post?

[ptb]

QUOTE(saltyfish @ 06/27/08, 08:09 PM) [snapback]287606[/snapback]
unfortunately,it is animated.....

Is there any setting to optimize the fluid ?

there are a lot of settings for fluid optimization

But now it depends again on what kind of animation you want:

• if you want the fluid to collide with objects then you'll need to increase the container resolution which will lead to long renderings.

• if you don't want the fluid to collide, but only to change it's structure or give it a windy look, then keeping the resolution low and animating the texture time and/or textureOffset will do it. The rendering times, in my experience, will be fine (use preview quality if you don't have the time for production, the small artifacts can be removed in post if you even have to).

Oh, and ALWAYS render it with mental ray, much faster.

[joojaa]

QUOTE(Ptb @ 07/03/08, 11:50 PM) [snapback]287872[/snapback]
Oh, and ALWAYS render it with mental ray, much faster.

yes but only if you don't hapen to have 100 spare machines lying around doing nothing. So yes ive actually sometimes rendered with maya software because fluid was faster that way, because the other option would heva been more licenses.

[ptb]

QUOTE(Joojaa @ 07/04/08, 06:10 AM) [snapback]287894[/snapback]
yes but only if you don't hapen to have 100 spare machines lying around doing nothing. So yes ive actually sometimes rendered with maya software because fluid was faster that way, because the other option would heva been more licenses.

are you sure? my experiences are very different. To be sure, I just created a simple container with center gradient and rendered in maya and MR (prod. qual.) :
Maya: 9 Sec
MR: 4 Sec

And even if I had 100 machines I'd be careful, because parallelism can create artifacts in the fluid.

[joojaa]

yes but for one 2000$ you get 1 maya license which gives you 4 mr licenses. So if you happen to have a university full of unused coputers about 300 in all free every night its still. (ive been in this situation, so even using shake for comp lost in speed for 300 nodes of very slow maya software comp use. Well i used to work for the university and i could have boosted to 900 systems but i dint want to opush my bosses nerves.) Still not much compared to the power we have nowdaysas each todays computer is worth 6 of those. But still, fiber optics nas just rules.

Artifacts dont count if you spread frames over.

one frame with maya software per 0.03 frames versus 0.5 fremes per sec. So the speed depends on additional parameters tha just raw speed. Offcourse fluids render even faster on prman, than on mr.

So yes even this si conditional.

PS: i believe in showing theres NO right answers in practical computing. slower can be faster it all depends on your conditions.

[fxnurbs]

In my experience and all the tutorials i have seen, Mental Ray is really faster than M Software for fluids.
and if you decrease the samples it is a lot faster.

(of course if you are not using motion blur)

Cheers
jaz