Small Chunks in Fluids

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
  03 March 2012
Small Chunks in Fluids

So I've got a fire fluid sim that looks pretty cool, but I find that when the voxels start to spread apart or become thin, my fire has a sort of square, chunk look to it.

I've lightly circled an area with arrows on here to show what I'm seeing.



I've tried to up the resolution of the container and the quality of the shading is at 1.0 is there something else I need to do to combat this?

Thanks!
__________________
Jamie Clark
SamJam design
 
  03 March 2012
did you set the render interpolation to "smooth" ?
seems to me like a voxel issue. I'd try with more voxels
__________________
mathiasmarkovits[dot]com
 
  03 March 2012
hey, looking nice man. With what I have encountered with fluid fire is that you don't need to go too high with the resolution, the fire quickly becomes too crisp for better words and looks unrealistic. As for those chunks you are seeing, this sim doesn't have any motion blur on it, and usually fire is burning pretty fast, so the motion blur is going to hide a lot. I get pretty good results with the solver set to "all Grids except velocity, and forward advection ticked on. Also play around with your Emission speed Attr. I usually use the "replace" method.

edit ( also just though about your opacity ramp) try and pull that down a bit. Hard to tell what might be the issue without seeing your settings.

Last edited by cowboy71 : 03 March 2012 at 01:09 AM.
 
  03 March 2012
Originally Posted by m0z: did you set the render interpolation to "smooth" ?
seems to me like a voxel issue. I'd try with more voxels


No it was set to linear by default. I'll try that and also see about adding more voxels thanks!
__________________
Jamie Clark
SamJam design
 
  03 March 2012
Originally Posted by cowboy71: hey, looking nice man. With what I have encountered with fluid fire is that you don't need to go too high with the resolution, the fire quickly becomes too crisp for better words and looks unrealistic. As for those chunks you are seeing, this sim doesn't have any motion blur on it, and usually fire is burning pretty fast, so the motion blur is going to hide a lot. I get pretty good results with the solver set to "all Grids except velocity, and forward advection ticked on. Also play around with your Emission speed Attr. I usually use the "replace" method.

edit ( also just though about your opacity ramp) try and pull that down a bit. Hard to tell what might be the issue without seeing your settings.


Thanks very much

I'll try it the motion blur and the other suggestions. The emission speed I had left at default, and the solver was also defaulted at "off"

Thanks for the help I'll report back and let you know how it goes!
__________________
Jamie Clark
SamJam design
 
  03 March 2012
If (don't want to change the behavior of the sim)

mess with the opacity ramp and its input bias;

else
try a sim with high substeps;

It could be that a high swirl value is causing that. Also try lowering you temperature turbulence.

There are so many settings its hard to say what could be the cause..
 
  03 March 2012
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
__________________
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
 
Thread Closed share thread



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
CGSociety
Society of Digital Artists
www.cgsociety.org

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump
Miscellaneous

All times are GMT. The time now is 07:36 AM.


Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.