Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: gerbilho on 2014-05-07, 00:37:31

Title: HDRI Workflow
Post by: gerbilho on 2014-05-07, 00:37:31

Hi

I haven't found much info on how to set up HDR lighting in Corona. A video on youtube shows how to place the HDR map in the environmental slot and portals on windows. It also talks about material override, but I don't understand why should there be a material override.
Is that the best way to do it? Are portals really necessary?

Thank you

Title: Re: HDRI Workflow
Post by: Ondra on 2014-05-07, 00:41:25

portals are always 100% optional.

Rule of thumb is, if you don't understand a feature, you don't need to change it. You will get great results with the default settings.

Title: Re: HDRI Workflow
Post by: gerbilho on 2014-05-07, 15:49:34

Thank you so much! It's working fine with HDR in environmental slot. But this raises another question: I need to render on a black background, how do I do it? In Vray I put the HDR in a dome light and set the background to black. How do I make this in Corona?

Title: Re: HDRI Workflow
Post by: romullus on 2014-05-07, 15:52:31

Corona settings -> Enviroment -> Direct visibility override

Title: Re: HDRI Workflow
Post by: gerbilho on 2014-05-07, 16:28:52

Thank you. Problem solved!

Title: Re: HDRI Workflow
Post by: gerbilho on 2014-05-09, 18:24:22

Not solved after all... Direct Visibility Override doesn't work through glass windows. I'm rendering an interior scene and the exterior needs to render black but instead it renders the HDR envoronmental map. I can change it in post using the alpha channel but is there a way to do it in render?

Title: Re: HDRI Workflow
Post by: romullus on 2014-05-09, 18:47:12

Corona settings -> Enviroment -> Refractions override :]

Title: Re: HDRI Workflow
Post by: gerbilho on 2014-05-14, 19:33:39

Quote from: romullus on 2014-05-09, 18:47:12

Corona settings -> Enviroment -> Refractions override :]

Thank you so much. :)

Title: Re: HDRI Workflow
Post by: Tanakov on 2014-05-15, 07:34:10

Corona settings -> Enviroment -> Direct visibility override

I noticed that changing exposure and and temperature affects this, is there a away to make it ignore those settings?

I sometimes have the scene where I want to have some white bg, but I add a lot of temp, that changes a lot in the overal output.

What can I do?

Title: Re: HDRI Workflow
Post by: Ondra on 2014-05-15, 09:01:26

use coronamapoutput map

Title: Re: HDRI Workflow
Post by: Tanakov on 2014-05-16, 15:09:49

I did, works just as I needed it to work, thanks

I noticed something, even if you add the coronamapoutput and mess with the whitebalance the bg is still affected.
The problem disapears if you click render again, yet it requires that operation. Not to complain, just informing.

Title: Re: HDRI Workflow
Post by: Ondra on 2014-05-16, 18:48:07

yes, because if you thing about it, it cannot be done in any othe way. You cannot reliably change material properties in finished render