Distant hypervoxels too bright

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
Old 02 February 2003   #1
Distant hypervoxels too bright

Whenever I use hypervoxel volumetrics, I always run into the same problem. Everthing looks fine, except for the voxels that are furthest away from the camera. The always appear very bright, and cause teribble flickering in animation.

Here's a quick example of a fluffy cloudy nigth sky. The full moon is high on the left. The voxels in the distant middle are way to bright.



What's wrong here ? Do I need to apply some falloff ?

grtz
 
Old 02 February 2003   #2
Funny you should ask that...
I was farting around with voxels earlier tonight and I figured something out.
On those same exact voxels you have there if you increase the size they lose their density and render very white.
IF you increase the density then they come back down to the dark gray like the closer ones in the foreground like youve shown here.
If these voxels(the ones giving you problems) are farther and apart of a differant point collection or a differant emitter you can try to play with those densitys and fix it.
If they are the same emitter or point cloud then you might have to adjust an envolope or something to get them all on the same density level.
I dont know if this will work but I thought of this after noticing the same thing today.

Hope this helps.
 
Old 02 February 2003   #3
Re: Distant hypervoxels too bright

Quote: Originally posted by thx1138
Whenever I use hypervoxel volumetrics, I always run into the same problem. Everthing looks fine, except for the voxels that are furthest away from the camera. The always appear very bright, and cause teribble flickering in animation.

Here's a quick example of a fluffy cloudy nigth sky. The full moon is high on the left. The voxels in the distant middle are way to bright.



What's wrong here ? Do I need to apply some falloff ?

grtz


Firstly I wouldn't use Hypervoxels to do a scene like that. Turbulance rocks, it's even better than fractal noise.

But if you do, you can use gradients set to distance from camera to adjust just about everything in regards to colour, luminosity and most everything hypervoxel related. In fact you can even do some things you can't do with polygons like particle age.

You can also use distance dissolve or fog. Although I am not sure if distance dissolve works on Hypervoxels (never needed it.)

X
__________________
Evolve or Die
 
Old 02 February 2003   #4
Had this problem not long ago while trying to make a row of trees. It's really frustrating and the best I could do was decrease the hypervoxels opacity, and apply a "distance to camera" gradient to darken them when they are further away. I hope Newtek fix this for the next release!
 
Old 02 February 2003   #5
Re: Re: Distant hypervoxels too bright

Quote: Originally posted by Arte
You can also use distance dissolve or fog. Although I am not sure if distance dissolve works on Hypervoxels (never needed it.)

X


HV's aren't affected by fog either!! :thumbsdow
 
Old 02 February 2003   #6
HVs and fog

" HV's aren't affected by fog either!! "

I noticed this with an underwater scene I am working on... is there a way around this or should I be looking at doing something post-render? I'm still learning so I don't know much about the processes yet so any insight on solving this would be helpful. Thx!

Phlio
__________________
-= My message is simple. Let's be good to each other and live a good life. Peace. =-
 
Old 02 February 2003   #7
I'm in the same boat as you, ie still learning so my solution was to not use fog If you have any better ideas please share them!
 
Old 01 January 2006   #8
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 02:29 PM.


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