Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Vykoukal on 2016-10-16, 21:57:29

Title: Volumetric fog - works weird
Post by: Vykoukal on 2016-10-16, 21:57:29

Hello guys, I´ve currently hit this difficulty that I´m not really able to set volumetric fog right or maybe it´s something else. I´m attaching two rough renders - first one is with no volumetric fog at all, second one is the best I´ve been able to achieve by setting volumetric material and pluging it into scene render settings. I´m using Corona in Cinema 4D.
What I would like to achieve is nice enviromental fog, which is increasing by distance from camera and some godrays.
I will appreciate any help. Spent a lot of time figuring out how to deal with it and eventually this is maximum I could do.
Thank you very much in advance.
Jakub

http://imageshack.cz/images/2016/10/16/2.jpg (http://imageshack.cz/images/2016/10/16/2.jpg)
http://imageshack.cz/images/2016/10/16/1.jpg (http://imageshack.cz/images/2016/10/16/1.jpg)

Title: Re: Volumetric fog - works weird
Post by: Vykoukal on 2016-10-17, 10:46:50

I've just found out, that it could be caused by type of my Corona license. I'm using Alpha V5 for Cinema 4D. Is it why I cannot achieve proper environmental haze with godrays?
Thank you!

Title: Re: Volumetric fog - works weird
Post by: maru on 2016-10-17, 14:15:10

Can you show how you are setting up your fog? I think it should work fine in A5.

Title: Re: Volumetric fog - works weird
Post by: Vykoukal on 2016-10-18, 01:10:34

Hi Maru, thanks for responding. I´m attaching screenshot of my material settings. However I tried many different combinations of distance, scattering, absorption with no big success. Whole scene is just getting overally foggy without any counting of distance, etc...
http://imageshack.cz/image/Ulx (http://imageshack.cz/image/Ulx)

Title: Re: Volumetric fog - works weird
Post by: maru on 2016-10-20, 14:32:11

It looks like it works fine with A5. Here is an example. The scene is a bit random, but you can see godrays and stuff. ;) Saved in R18, let me know if it works fine for you.

Title: Re: Volumetric fog - works weird
Post by: Vykoukal on 2016-10-22, 15:24:45

Thank you Maru, your scene works perfectly. Is it possible, that it could be caused by size of the scene? I mean, my scene has about 10 cm grid spacing, yours has 10000. Or I don´t have any idea what else could cause it...

Edit: It does affect it, attaching screen of similar boxes but way smaller. So I guess it is solved, thank you! :)
(http://imageshack.cz/images/2016/10/22/2016-10-22.md.png) (http://imageshack.cz/image/Uqd)

Title: Re: Volumetric fog - works weird
Post by: Jpjapers on 2016-10-22, 16:35:24

Is your scene modelled in real world dimensions? I suspect not because of the subject matter. Would that make a difference maru?

Title: Re: Volumetric fog - works weird
Post by: Vykoukal on 2016-10-22, 17:18:29

Well scale definitely matters in my opinion. I downscaled those boxes about 100 times and then played with volumetric material a lot, but couldn't achieve anything even close to Maru's scene.
But if you make it bigger, everything works just like it should...

Title: Re: Volumetric fog - works weird
Post by: maru on 2016-10-22, 18:53:19

Yes, the scale does matter, since absorption is scene units. Sorry for not mentioning this fact.