Secondary in Standard Shader causes black overlay

sevek

Hello dear Polycounters, i need your help

i'm working on environment for my game, a street to be exact. Here's a model i created in Blender: 

I'm trying to get it into to Unity, and everything is fine up to the point where i try to add road surface markings (white stripes). I want to add them as a secondary maps. I have second UV channel layed out properly, stripes have a correct alpha channel, everything looks good in terms of setup. However after applying a secondary map, the stripes do appear, but the whole street becomes black for whatever reason. I don't understand that, since the whole area except stripes is alpha channeled, there should be no texture at all.

Does anybody have any idea from where does this black overlay comes from ? Additionaly, do you think this is a good idea to add those stripes as a secondary map, if not, what's the better approach.

Eric Chadwick

The secondary Albedo in the Standard shader is multiplied onto the primary Albedo. I'm pretty sure it disregards the alpha channel completely. You probably have black in your empty areas.

They do have a Detail Mask in which you could put your alpha as a grayscale texture.

Or you could try a decal shader instead.
https://docs.unity3d.com/Manual/shader-NormalDecal.html

sevek

Thank you Eric. This is very helpful. You deducted correctrly that i have a black color in empty areas. It's good to know that standard shader will not treat them as alpha.
I will try with hiding black areas with detail mask as you suggest.