Fluids Smoke

[ratika]

helo everyone.
I m new in cgsociety just a beginner. I don’t have any idea about dynamics in maya (8.5 and 2009), Just got an assignment to make a realistic smoke from cigratte.
I would be very thankfull,if anyone can help me in making realistic smoke and can tell me how can I add these words coming out as smoke " I m DEATH".

[JonK723]

I just wanted to say thanks to all the great advice on this very tricky subject. I’m working on a short film for my graduate thesis and a major part of it is creating some pretty great looking dust/smoke. Here is a screen shot of what my particles look like. Now, I’m trying to figure out how to make this render faster (it’s currently pushing 15mins a frame). In terms of setup, I’m using a torus as an emitter and following the steps described on the 2nd and 3rd pages of this thread.

http://2.bp.blogspot.com/_gFJZJEd3Z1A/SZNOv4cZnwI/AAAAAAAAAE0/CpH6Mb0GbS4/s1600-h/ParticleDustCloud.jpg

Thanks a lot everyone,

Jon

[heavy1]

hey Jonk 8]

its very important, that you try not to overlap to much particles.
Overlapping ptkl let the rendering time explode. so try to use as few as possible
particles without getting gaps between them.

And you can also half the torus, so you only emit where your cam is looking at,
your shading is so dense, that you dont need Particles on the backside.

[JonK723]

hey Jonk 8]

 its very important, that you try not to overlap to much particles.
 Overlapping ptkl let the rendering time explode. so try to use as few as possible 
 particles without getting gaps between them.

And you can also half the torus, so you only emit where your cam is looking at,
your shading is so dense, that you dont need Particles on the backside.

 Currently, Im only emitting 25 particles per second but to avoid the particles from "popping into view I have the start and end sized pretty large, so that they overlap when birthed. Doing it this way creates a nice rolling effect which is what I'm going for. In terms of rendering it takes about 7 minutes per frame and I'm rendering at 1/4 my scene resolution. In post I'll scale them up and apply some motion blur to hide any artifacts. I am doing exactly as you stated and rendering from only the front side of the torus where the camera is facing.

[ratika]

I m looking forward for some help.

Plzzzzz someone here help me how start.

[movector]

I just wanted to say thanks to all the great advice on this very tricky subject. I’m working on a short film for my graduate thesis and a major part of it is creating some pretty great looking dust/smoke. Here is a screen shot of what my particles look like. Now, I’m trying to figure out how to make this render faster (it’s currently pushing 15mins a frame). In terms of setup, I’m using a torus as an emitter and following the steps described on the 2nd and 3rd pages of this thread.

http://2.bp.blogspot.com/_gFJZJEd3Z1A/SZNOv4cZnwI/AAAAAAAAAE0/CpH6Mb0GbS4/s1600-h/ParticleDustCloud.jpg

Thanks a lot everyone,

Jon

which version of maya are u using? with maya 2009, u can use mentalray to render much faster, or use afterburn for 3dsmax.
if it is a kind of dust, it might be too thick, and has some texture repeating?

[Strob]

which version of maya are u using? with maya 2009, u can use mentalray to render much faster, or use afterburn for 3dsmax.
if it is a kind of dust, it might be too thick, and has some texture repeating?

I agree with that, if you render in mental ray it will be like 1.2 time faster and if you have access to 3dsmax and afterburn, it will be like 35 time faster for this kind of smoke.

[heavy1]

What ??? 35 times ? :hmm: damn!

ähhh … please Duncan, why is that not possible in Maya ?

[Strob]

What ??? 35 times ? :hmm: damn!

ähhh … please Duncan, why is that not possible in Maya ?

I saw a maya 2009 presentation by Duncan where he talks about improved volumetric rendering in mental ray for particles, but I don’t know about rendering times… I have not tried maya 2009 yet.

the presentation is on that link (click segment 04 for Duncan): http://area.autodesk.com/siggraph

[heavy1]

yeah 8] i have seen this on that day, have been out the whole night,
but i dont think it breaks these 35 times…

maybe smbody could write a pre render mel where we can turn on and off the
not needed parts of a fluid so they will not be calculated and speed up the whole
process…

[azshall]

yeah 8] i have seen this on that day, have been out the whole night,
but i dont think it breaks these 35 times…

maybe smbody could write a pre render mel where we can turn on and off the
not needed parts of a fluid so they will not be calculated and speed up the whole
process…

I think he’s exaggerating slightly. It might be faster, but not by that stretch

[Strob]

I think he’s exaggerating slightly. It might be faster, but not by that stretch

This was rendered in afterburn in 1.4 sec (dual xeon quad core 2.5ghz, 8gig ram)

[Aikiman]

I wish Maya would render that fast then again your hardware is nothing to sneeze at.

This was rendered in afterburn in 1.4 sec (dual xeon quad core 2.5ghz, 8gig ram)

[azshall]

This was rendered in afterburn in 1.4 sec (dual xeon quad core 2.5ghz, 8gig ram)

Nice intestinal track. … Those janky looking fluids really tell us nothing. Try something that really takes some time to render like a nuke, explosion or something thats a bit more involved. Use even one of the Maya Presets as a test bed perhaps? Not saying that afterburn isn’t faster but… Come on with that render

[bazuka]

@Strob

dont get me wrong but this is a maya forum, btw i know how afterburn work and how fast is it, if u can show us anything using maya fluids that would be nice…

like azshall said “Those janky looking fluids really tell us nothing”

cheers

[Strob]

@Strob

dont get me wrong but this is a maya forum, btw i know how afterburn work and how fast is it, if u can show us anything using maya fluids that would be nice…

like azshall said “Those janky looking fluids really tell us nothing”

cheers

You are right I should post only maya stuff here. Maybe CGtalk should create a general technique subsection about VFX where we could compare different software using the same techniques. The fact is that I am a Maya, 3dsmax and XSI user so I have to compare everyday what is faster. And about the “janky” stuff, I’m just trying to help JonK723 here by trying to replicate his smoke and improve his render time for his studies.

So here is again what JunK723 posted as his test that took 15 minute to render (btw JonK723, I would like to know the spec of your hardware), let’s try to improve this.

I tried to replicate it in maya using overburn script. Since mental ray does not support the method using particleSamplerInfo nodes I had to render with maya software, it took 2min 19sec.

[azshall]

You are right I should post only maya stuff here. Maybe CGtalk should create a general technique subsection about VFX where we could compare different software using the same techniques.

I think that would be a great idea, actually.

[Strob]

I made the suggestion here . They ask to create a poll for it but I couldn’t. So maybe just add your word to my post there.

[azshall]

The fact is that I am a Maya, 3dsmax and XSI user so I have to compare everyday what is faster. And about the “janky” stuff, I’m just trying to help JonK723 here by trying to replicate his smoke and improve his render time for his studies.

So here is again what JunK723 posted as his test that took 15 minute to render (btw JonK723, I would like to know the spec of your hardware), let’s try to improve this.

I tried to replicate it in maya using overburn script. Since mental ray does not support the method using particleSamplerInfo nodes I had to render with maya software, it took 2min 19sec.

So Maya was slower. Look at both images and whats being rendered, are you telling me the detail, the shadowing and quality of render is better with max? Side by side (of those 2 images), Mayas actually looks better because there is more going into the render, doesn’t mean it should be slower but it definitely feels like there is more going on in the render than the Max version.

[Strob]

So Maya was slower. Look at both images and whats being rendered, are you telling me the detail, the shadowing and quality of render is better with max? Side by side (of those 2 images), Mayas actually looks better because there is more going into the render, doesn’t mean it should be slower but it definitely feels like there is more going on in the render than the Max version.

No, those 2 images you are talking about were done in Maya!!! The first one was done by JunK723 in 15 minutes and the second one by me in 2 min. Both are made in maya using fluid shader on particles.

If we want to compare maya and afterburn we can do it here:

below MAYA 15 min:

below MAYA 2minutes:
[img]http://www.strob.net/cgtalk/mayaOverburn_ScreenShot_005.jpg[/img]


below AFTERBURN  1.4sec
[img]http://www.strob.net/cgtalk/aburn_ScreenShot_001.jpg[/img]

Generally I prefer the afterburn look, it looks smoother with more details. The self shadow is more defined and I feel less the particles under. But sometimes maya fluids can gives a different look. And I prefer the technique I saw here by [Don3don who use instanced fluids](http://forums.cgsociety.org/showpost.php?p=5595231&postcount=365) instead of fluid shaded particles I would like to try that in Maya, coul be better looking than afterburn.