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General => File Sharing => Skies, Atmo, Clouds => Topic started by: fleetwood on July 04, 2016, 08:35:41 pm

Title: Param C tests
Post by: fleetwood on July 04, 2016, 08:35:41 pm
Some renders of one cloud setup changing only the Param C value. Used 0.0, 0.01 thru 0.1 by hundredths, then 0.2.0.3,0.4,0.5 and finally 5.0
Sun is behind the clouds with glow set on.
Title: Re: Param C tests
Post by: fleetwood on July 04, 2016, 08:36:44 pm
continued...
Title: Re: Param C tests
Post by: fleetwood on July 04, 2016, 08:38:47 pm
contunued...
Title: Re: Param C tests
Post by: AP on July 04, 2016, 11:02:57 pm
Peram C 0.5 to 5.0 does not seem to have much of an effect if any. Perhaps 0 to 1 is max? Interesting tests.
Title: Re: Param C tests
Post by: Dune on July 05, 2016, 01:39:56 am
It clearly influences the translucency of the clouds. Thanks for testing.
Title: Re: Param C tests
Post by: zaxxon on July 05, 2016, 09:58:50 am
Nice exercise to demo Param C. Thanks for the spread of image settings.
Title: Re: Param C tests
Post by: Mr_Lamppost on July 05, 2016, 05:57:38 pm
Interesting tests, thanks for sharing.
Title: Re: Param C tests
Post by: AP on July 05, 2016, 06:24:39 pm
One single file for referencing.
Title: Re: Param C tests
Post by: Dune on July 06, 2016, 01:30:13 am
Now that is very handy. Thanks.
Title: Re: Param C tests
Post by: bobbystahr on July 06, 2016, 02:53:15 am
Quote from: Dune on July 06, 2016, 01:30:13 am
Now that is very handy. Thanks.


It sure is, thanks Chris, and thanks fleetwood for doing that...saved me hours. And now I know what the mysterious Param C does.
Title: Re: Param C tests
Post by: mhaze on July 06, 2016, 04:32:51 am
Thank you, very useful.
Title: Re: Param C tests
Post by: AP on July 06, 2016, 05:35:41 am
Certainly.
Title: Re: Param C tests
Post by: DannyG on July 08, 2016, 12:58:09 pm
Thanks, very useful
Title: Re: Param C tests
Post by: fleetwood on July 09, 2016, 12:23:12 am
Here are a few more tests using lighting from the front left. Values 0.0 to 0.5. I get a bit different impression of Param C in this front light.
Title: Re: Param C tests
Post by: AP on July 09, 2016, 01:23:41 am
A Param C of 0.40 not shown could be a good compromise. Not to dark and not to bright.
Title: Re: Param C tests
Post by: Dune on July 09, 2016, 01:29:19 am
Looks like it. There's also the interplay with the color of the cloud. Perhaps a low Param C and lighter cloud will yield interesting results as well. While you're at it, Fleetwood..... ;)
Title: Re: Param C tests
Post by: Kadri on July 09, 2016, 01:48:20 am

Good tests. Still not sure how to interpret that option. 
Title: Re: Param C tests
Post by: fleetwood on July 09, 2016, 07:04:37 am
Quote from: Dune on July 09, 2016, 01:29:19 am
Looks like it. There's also the interplay with the color of the cloud. Perhaps a low Param C and lighter cloud will yield interesting results as well. While you're at it, Fleetwood..... ;)


So many possibilities. I usually leave cloud color at 0.25 white since I recall Matt indicated (at least I think he did) that setting the cloud whiteness above  0.25 goes beyond what is possible with light in real clouds, but there are plenty of cases when going lighter seemed to give the emphasis or effect I wanted.   
Title: Re: Param C tests
Post by: Dune on July 09, 2016, 08:02:38 am
Yes, you have to take care not to bleach all whites into just white.
Title: Re: Param C tests
Post by: fleetwood on July 09, 2016, 03:46:05 pm
One final example using a negative Param C value of  - 0.1.
Interesting result, but seems to have what look like bucket related artifacts.
Title: Re: Param C tests
Post by: Dune on July 10, 2016, 02:16:50 am
Yeah, very weird. Well, sometimes it pays to use extreme or negative values, sometimes it doesn't.
Title: Re: Param C tests
Post by: 3DnTechNut on July 10, 2016, 08:05:40 am
Quote from: fleetwood on July 09, 2016, 03:46:05 pm
One final example using a negative Param C value of  - 0.1.
Interesting result, but seems to have what look like bucket related artifacts.


Interesting result. 

Does anybody else see two dogs looking down at the ground from the negative cloud? 

Maybe I have been working to long?! :-\
Title: Re: Param C tests
Post by: Dune on July 11, 2016, 02:37:11 am
Now that you mention it, yes. Funny.
Title: Re: Param C tests
Post by: KlausK on July 11, 2016, 03:26:28 am
Right!
A little bit like Falcor, the flying Luck Dragon from "The Never ending Story" by Michael Ende, hehe.
cheers, Klaus
Title: Re: Param C tests
Post by: fleetwood on July 11, 2016, 06:50:53 am
I see them now, cute little Bluetick hound pups and Timmy and Lassie way far away in the background (well, maybe not without enhancement)
Title: Re: Param C tests
Post by: bobbystahr on July 19, 2020, 10:54:46 am
Quote from: Dune on July 11, 2016, 02:37:11 amNow that you mention it, yes. Funny.
ditto