vellmans
Posts: 7
Joined: Fri 20 Oct 2017 07:23

Psd glass / alpha channel

Thu 23 Aug 2018 18:11

In earlier versions glass shader (windows in interior) was automatically empty/alpha channel if rendered as psd. Now in 7 it’s white/not transparent. Is there a certain trick to do that or am I doing something wrong?

Velma

juancamiloarq
Posts: 29
Joined: Fri 3 Feb 2017 14:25
Location: Bucaramanga, Colombia

Re: Psd glass / alpha channel

Sun 26 Aug 2018 20:38

Thats changed since ATL 6 engine update and hasn't been fixed. You are right.
Juan

vellmans
Posts: 7
Joined: Fri 20 Oct 2017 07:23

Re: Psd glass / alpha channel

Tue 29 Jan 2019 13:10

How is this in version 2019? Is glass transparent there?

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CamilleSarrut
Posts: 476
Joined: Tue 20 Oct 2015 08:41

Re: Psd glass / alpha channel

Tue 29 Jan 2019 14:36

Hello,

Unfortunately no, it is a limitation of the engine used since version 6, it won't be fixed.
But, as a workaround, you can uncheck the Visible flag of the window pane material:
workaround_psd.png
workaround_psd.png (364.12 KiB) Viewed 156 times

test_window_pane_flag_invisible_in_GIMP.png
test_window_pane_flag_invisible_in_GIMP.png (308.24 KiB) Viewed 156 times

png_and_psd.zip
(1.26 MiB) Downloaded 5 times

I have attached the psd in a zipped folder, I could not attach it by itself...

Hope this helps.
Camille Sarrut
Abvent R&D

vellmans
Posts: 7
Joined: Fri 20 Oct 2017 07:23

Re: Psd glass / alpha channel

Wed 30 Jan 2019 08:15

Thank You, Camille, for the quick answer. I guess it's possible to do like that but it's not the same. It's more like a hole in the wall, in real window visibility is not perfect (possible to do the effect in photoshop, of course...) and there can be reflections, which is quite difficult to post-process. In some cases maybe this works well.

Velma
Last edited by vellmans on Sat 16 Feb 2019 12:13, edited 1 time in total.

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CamilleSarrut
Posts: 476
Joined: Tue 20 Oct 2015 08:41

Re: Psd glass / alpha channel

Wed 30 Jan 2019 08:37

vellmans wrote:Thank You, Camille, for the quick answer. I guess it's possible to do like that but it's not the same. It's more like a hole in the wall, in real window visibility is not perfect (possible to the effect in photoshop, of course...) and there can be reflections, which is quite difficult to post-process. In some cases maybe this works well.

Velma


As I said, it is a work around, I understand it does not work in all situations, but there is nothing we can do to fix this issue. Sorry.
Camille Sarrut
Abvent R&D

mumu
Posts: 2
Joined: Thu 14 Feb 2019 07:32

Re: Psd glass / alpha channel

Thu 14 Feb 2019 07:56

I also consider this issue with transparent background a big flaw in Artlantis new engine.
I used it a lot in postproduction and I consider Camille workaround a very poor solution.

You can obtain a much better result putting a panel outside of the window and adding a picture to it. This way you can preserve the reflections on the glass.
Remember to disable all shadows on the panel material!
Of course you have to experiment a bit with lighting and panel distance from the window, but I think you will like the result.

Schermata 2019-02-13 alle 12.29.11.png
Schermata 2019-02-13 alle 12.29.11.png (168.18 KiB) Viewed 67 times

14A_2ee.jpg
14A_2ee.jpg (222.51 KiB) Viewed 67 times

vellmans
Posts: 7
Joined: Fri 20 Oct 2017 07:23

Re: Psd glass / alpha channel

Sat 16 Feb 2019 14:54

That's interesting, but how does it differ from 2d image in the background...? Or what is the benefit in Photoshop? Transparent background has always be ok, but non-transparent glass in PS channel is not so much...

mumu
Posts: 2
Joined: Thu 14 Feb 2019 07:32

Re: Psd glass / alpha channel

Mon 18 Feb 2019 15:00

There is no difference at all in Photoshop post production.
But (as is the case in my example) you can use an HDRI sky and a cityscape image as fake background outside the window.
This way you can have glass reflection that you would loose hiding the glass material as suggested by Camille's trick.

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