Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: erick3d on 2015-04-16, 11:11:05

Title: Background behind glass
Post by: erick3d on 2015-04-16, 11:11:05

hi
i need a little help to know workflow  to  change background behind glass in PS
here's a test i did on old project with VRAY, hope it's more explicit

(http://content.screencast.com/users/erick3d/folders/Jing/media/bcf86ae0-d1cf-4937-ada1-71457750e8be/2015-04-16_1100.png)

i saw this
https://coronarenderer.freshdesk.com/support/solutions/articles/5000516227-how-to-render-alpha-channel-
https://corona-renderer.com/features/workflow-tweaks/

bt not sure it helps....

thanks

Erick

Title: Re: Background behind glass
Post by: Nekrobul on 2015-04-16, 11:24:42

You place background virst and then on top of it image it self saved in PNG.

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 11:32:53

humm thanks
to be more clear....

my render is done saved in TIF with a sky behind glass, but client wanna change the sky

here my render
(http://content.screencast.com/users/erick3d/folders/Jing/media/ddfdb434-820c-4411-baed-83877a9f61c8/2015-04-16_1128.png)

dos it means i have to make another render wihtout the plane  (sky) ?
sorry that's sounds not really clear for me

Erick

Title: Re: Background behind glass
Post by: maru on 2015-04-16, 12:05:09

Hi, sorry but I don't understand the problem. You should be able to render the image + alpha channel. Then use some compositing software to replace the sky. So if the image from last post is final and you do not want to re-render it, simply add CShading_Alpha render element and go to Scene > Render only elements.

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 13:01:38

Thanks maru
but sorry i don't understand u too....
this is  my alpha.
as u can see , the glass panel are full white..

(http://content.screencast.com/users/erick3d/folders/Jing/media/83a1b520-d382-4476-93c2-c0c55935188d/2015-04-16_1257.png)
think i will need to remove the plane with the sky bitmap  and save it as png


I miss something for sure

Title: Re: Background behind glass
Post by: maru on 2015-04-16, 13:20:12

It must be a wrong material setup. Can you show your glass material's "advanced options" rollout in material editor?

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 13:38:10

sure
her eit is
never paid attention to advanced otpion ,as it's not usual for me to have transparent glass.
(http://screencast.com/t/2jbh3AR7gI)

so what should i do ?

Visible in masks = off
Alpha mode = "Default"

or

Alpha mode = "Always transparent"?

Title: Re: Background behind glass
Post by: maru on 2015-04-16, 14:02:50

Which Corona version are you using? This is how glass works for me in alpha channel. Can you show screenshot of the material from mateditor?

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 14:10:59

latest version of corona

her's screnshot

(http://content.screencast.com/users/erick3d/folders/Jing/media/93a0d108-dbdb-4c48-a406-4c5635019214/2015-04-16_1332.png)

Title: Re: Background behind glass
Post by: maru on 2015-04-16, 15:20:11

And can you show the rest of material setup? :)

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 16:03:57

first tanks again for ur help and...patience ! lol

making some investigations by myself.....
It works  but the plane which contain the sky for background make a full solid alpha...just need to make "alpha contribution =-1" or remove it at all... (but render was made with it ..fucked client, fucked me , bad workflow)

here the screen

(http://content.screencast.com/users/erick3d/folders/Jing/media/9cdfd6e6-585b-4745-8ba2-c09fd59ee8b6/2015-04-16_1601.png)

Title: Re: Background behind glass
Post by: maru on 2015-04-16, 17:08:43

Quote from: erick3d on 2015-04-16, 16:03:57

first tanks again for ur help and...patience ! lol

making some investigations by myself.....
It works  but the plane which contain the sky for background make a full solid alpha...just need to make "alpha contribution =-1" or remove it at all... (but render was made with it ..fucked client, fucked me , bad workflow)

Oh. Actually this is a very important thing which I should have asked. How is the background made. I thought it's just an enviro override. Sorry. Let's hope we will be both smarter next time. :)

Title: Re: Background behind glass
Post by: erick3d on 2015-04-16, 17:09:47

hhaaa..but thanks anyway..have a nice day !