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DarkBASIC Professional Discussion / Volumetric Fog

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MateiSoft Romania
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Posted: 4th Feb 2015 14:13
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Hello,

Can i create with dark physics or dark dynamix volumetric fog? I mean, the original fog from DBPRO it doesnt let me see the sky the whole scene is pitch black or depends on the color I add.

Thank You!

Alex Matei CEO
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Van B
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Posted: 4th Feb 2015 16:28
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To get decent fog, make sure to use alpha transparent PNG files.

Some systems might use ghosting, or negative ghosting - and this is an additive effect that adds to the colour. So when you use volumetric particles that rely on ghosting, you end up with black or white when the density is too thick - this doesn't take much.

If you use alpha transparent textures instead, you could have a grey cloud, and layers or volumes of this grey cloud would result in a volumetric grey cloud, as it won't affect the actual colour, but the alpha transparency. You can also change the colour of the particle with this method - as opposed to ghosted particle effects that depend on the diffuse colour. For example, having a particle that starts off bright yellow, fades to orange quickly, then fades to grey as the alpha fades out, would give a cool explosion effect without needing lots of textures.

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MateiSoft Romania
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Posted: 4th Feb 2015 22:25
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Do you have an example please ?

Thank You!

Alex Matei CEO
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Van B
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Posted: 5th Feb 2015 09:04
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I will have a look at the DP examples and see if I can adapt it to suit... if not I'll just make a basic particle example to show what I mean. Check back in a day or so and I should have something posted.

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MateiSoft Romania
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Posted: 5th Feb 2015 09:12
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That will be so awesome!

Thank You very much for your time Van B!

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Burning Feet Man
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Posted: 5th Feb 2015 21:38
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Screenshots please, for us at work and on the train!

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Derek Darkly
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Posted: 7th Feb 2015 00:10 Edited at: 7th Feb 2015 00:12
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Hello Alex, and everyone...
I just wanted to add this question about fog plains if anyone wants to field it:

When I play Skyrim, some of the rooms have cool fog that fades on the edges and disappears as the texture scrolls (rather than going into a wall)... is this done with a shader? If so, is this called an 'edge shader' or 'fader' or something? Or is this an actual particle system with many plains rather than one plain?

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MateiSoft Romania
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Posted: 19th Feb 2015 15:18
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Any code for the fog?

Thank you very much!

Alex Matei CEO
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Kafoolwho
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Posted: 24th Feb 2015 10:18 Edited at: 24th Feb 2015 10:48
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MateiSoft, if you are using a skybox or skysphere, and you do not want the fog to affect it, you can use the command
SET OBJECT FOG yourobject,0
to disable fog on that object alone.
The fog would still display correctly on the rest of your geometry.
This only applies to the standard DBPro FOG command, though, and I agree, volumetric fog would be so much nicer, as the standard DBPro fog looks a bit outdated, to be honest.
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MateiSoft Romania
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Posted: 24th Feb 2015 23:00
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I have shaders on the objects. Thats why i wanted exponential.

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Kafoolwho
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Posted: 25th Feb 2015 13:57 Edited at: 25th Feb 2015 13:58
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Ah yes. The shader/fog issue. Since most shaders do not take fog into account, volumetric fog is definitely the way to go. I myself would be very interested in any techniques on how to do this. And the fog plain question Derek Darkly has set intrigues me as well.

Just on a side note, Evolved's shaders available at http://www.evolved-software.com do support fog, as illustrated in the picture below. The floor objects use parallax mapping, and after applying the fog range and colour to the shader, the fog shows up as it should.

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MateiSoft Romania
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Posted: 27th Feb 2015 13:10
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I understand so i will use then the basic DBPRO fog. I was thinking there was a particle system for Fog

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MateiSoft Romania
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Posted: 27th Feb 2015 13:43
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Very odd... I tried using the fog with Dark Shader Bloom Shader but i get a black screen...

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Mobilemedved
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Posted: 3rd Mar 2015 12:05
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DB particle system... Is it possible to specify an arbitrary particle size?

zzz!
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