I’m making transparent PBR material. My problem is that alpha (texture) is inverted. Painter and Unity are inverted.
So in Adobe Substance Painter use “Opacity” for 0 black transparent to 1 white opac and not transparent.
And in Unity 2019LTS PBR default shader the alpha transparency is inverted so
1 is white and transparent.
I did not find an option to invert the “Opacity” output in S. Painter:
In painter, there are a lot of layers that trigger my opacity so I’m not able or I do not know how to invert them properlly.
If I open Photoshop, the PNG has no alpha channel and the transparency is applied to the three RGB channels. So is a bit complex inverting the alpha or I do not know how to do it. (And difficult to change all my textures output)
An alpha of 1.0 is always opaque, 0.0 is always transparent. If there’s a Unity shader that it doesn’t work that way, it’s a bug. Though I should note Unity 2019 doesn’t itself come with a PBR shader. Are you referring one from the URP or HDRP?
As a follow up, even though you really should not need to do this for this case, Photoshop’s PNG handling is really terrible. It assumes you’re using PNG files for web pages and nothing else. If you want better control over PNG files, you should download SuperPNG and use that instead. If you hold down shift while opening a PNG with the SuperPNG plugin you can choose to open it with the alpha as a separate channel rather than as layer transparency. As well as save PNGs without clearing the color in areas with full transparency which Photoshop does by default and can’t be turned off.
