Help for mobile shader equal to Blending mode Darken

Hey all,

So I'm working on a game and assets like that one are supposed to be mountains in a level: http://i.imgur.com/MFVsiP4.png

We want to use a shader which makes the black color visible and the white color transparent, while also achieving best performance on mobile.

When imported in Unity however, some grey border appears on all black colored elements' edges. Like this: http://i.imgur.com/F7zop8d.png

That's the code used:

Code (CSharp):

1. Shader "Somian/Darken Texture"
2. {
3. Properties
4. {
5.   _Color ("Main Color", Color) = (1,1,1,1)
6.   _MainTex ("Texture", 2D) = ""
7. }
8.  
9. SubShader
10. {
11.   Tags { Queue = Transparent }
12.   Blend OneMinusSrcColor SrcColor
13.   ZWrite Off
14.   Cull Off
15.   Lighting Off
16.   Fog { Mode Off }
17.   Pass
18.   {
19.   SetTexture[_MainTex] { Combine texture }
20.   }
21. }
22. }

Any idea what is causing it and how to fix it?

Thanks in advance for any help on it!

 

Heya,

Thanks for the response! Now, these are the settings we are using to achieve the best compression:



Texture has no alpha.

 

Try
Blend DstColor Zero
Or
BlendOp Min

 

It worked! You are awesome!



Thank you both for your help, especially to @bgolus for providing us with a solution. Well, even two working solutions.

If you ever come to Bulgaria, you must know that you've earned yourself a few drinks.

Have a nice day!

P.S.: By the way, if you know even a better way to optimize for mobile, please feel free to share.

 

They are different btw. Blend DstColor Zero is the same as Photoshop multiply. BlendOp Min is the same as darken.