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Re: [Virtools] Fog: density, etc.

2 more things to know about fog ....
- In N... fog is computed per vertex that means the visual aspect of the fog will higly depend
on the tesselation of the objets.
- The other thing is that in DirectX for example the fog is stored as a 0..255 value per vertex
which might be the explanation of your "finite steps" aspect
 
For the video card that support exponential fog I'm afraid I don't know one...
 
++
Romain
 
----- Original Message -----
From: Lloyd, Rob
To: virtools-user-group@lists.theswapmeet.com
Sent: Wednesday, November 15, 2000 8:27 PM
Subject: RE: [Virtools] Fog: density, etc.

Romain,
 
Thank you for this information. It will keep me from banging my head up against a brick wall with endless experiments.
 
Is my second email correct about the finite steps of fog?
 
If I get a good particle system for fog, I'll have to post it to the swapmeet. The default fog behavior just doesn't do the job.
 
Regards,
 
Rob
 
 
-----Original Message-----
From: Romain Sididris [mailto:roro@easynet.fr]
Sent: Wednesday, November 15, 2000 11:51 AM
To: virtools-user-group@lists.theswapmeet.com
Subject: Re: [Virtools] Fog: density, etc.

About the fog in N....
 
- first of all very few video cards support other fog option than "linear" mode,
and in N... 1.0.1 I think that if you set "Exponential" or "Exponential Squared" , linear mode
was used instead if these modes were not supported (without warning the user which is a bug, sorry:(
 
- The fog start and fog end factors only apply in "Linear" mode , and as you said most of the time the Fog end factor will be equivalent to you camera back clipping plane....
 
- The fog density only applies when you are in Exponential modes which is as said above rarely the
case.... So that's why it looks like it have no effect :)
 
-  A ceiling on the fog would be akind of   "volumetric fog" which was not proposed by N... 1.0.1 so it's only an optical illusion in the sample you saw...
 
++
Romain
----- Original Message -----
From: Lloyd, Rob
To: virtools-user-group@lists.theswapmeet.com
Sent: Wednesday, November 15, 2000 5:15 PM
Subject: [Virtools] Fog: density, etc.

Hello,
 
Can someone elaborate on the fog in Virtools?
 
The density setting seems to have no effect.
The fog end value acts like a camera clipping plane [nothing is visible beyond it].
Is it possible to set a ceiling for the fog?
 
The sample recently posted [re:multitexturing and fog] seems to have fog with a ceiling. Is this simply an optical illusion?
 
I am experimenting with using particles for fog so I can control it and make it dimensional. Has anyone else tried this with success?
 
Regards,
 
Rob
References: