Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: miragemig on 2015-02-19, 18:11:54

Title: render good in frame buffer bad in output
Post by: miragemig on 2015-02-19, 18:11:54

Hi people
I´m testing corona with a  vray scene, and i get this problem with  the output file. It´s black.
Also the coronacammod does not change  the image, simply does not work.
The setting overall is desabled(untick).
Also tried to save with gamma1.0 and it´s the same issue.
I did the material convertion and the ligt also, evn made corona sun to see if the problem was with th converted sun.
 Can anyone help?

(http://s4.postimg.org/ap0cd6q95/image.jpg)
(http://s4.postimg.org/tvdjgd6qx/image.jpg)

Title: Re: render good in frame buffer bad in output
Post by: maru on 2015-02-19, 18:58:45

-which version of 3ds max are you using?
-which version of Corona?
-in 3ds max, go to rendering>gamma lut setup, how does the window look?
-when you are saving, what gamma options do you choose?

Is the saved file BLACK like you said or DARK, like in the posted picture?

Title: Re: render good in frame buffer bad in output
Post by: miragemig on 2015-02-19, 20:38:32

Hello

-Max version 2014
-Corona version: Alpha v7.2, Maxsdk version: 2014
-(http://s7.postimg.org/tusgiknkb/Capturar.jpg)
-gamma settings is "automatic" i do not imput any value

- Saved as itis in the image , after tweaking exposure and contrast in Fbuffer. because as it comes in render is all white scene. as i said reducing iso, shutter speed in coronacammod does nothing in my scene.

don´t know what is wrong


after a few ries i changed the output gamma to 2.2  with a script , so now it´s imput 2.2 and output 2.2 . and the images comes out correct.

In vray i allways use output 1.0 why is in corona diferente?

Title: Re: render good in frame buffer bad in output
Post by: modjtaba on 2016-07-25, 13:12:18

I have this problem too. why this happen?

Title: Re: render good in frame buffer bad in output
Post by: modjtaba on 2016-07-25, 13:27:38

I found the reason,
We need to save it in open exr (or any other high dynamic range) format , if we don't MAX will make gama multiplied by .44(1/2.2)

Title: Re: render good in frame buffer bad in output
Post by: Bormax on 2016-07-26, 09:24:14

Hi,

You can override output gamma in Save picture dialog, or you can correct output gamma in file CurrentDefaults.ini to keep this output gamma as default. It's located C:\Users\xxxx\AppData\Local\Autodesk\3dsMax\2014 - 64bit\ENU\en-US\defaults\MAX.vray (or Max / Max.mental ray if you use those defaults)
This way you can save whatever format with correct gamma

Title: Re: render good in frame buffer bad in output
Post by: maru on 2016-07-26, 17:20:27

Hi, several methods of changing gamma in different versions of 3ds Max are listed in this article:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000515647