Help on blending alpha and color channels independently

Hello!

I read that I can specify different Source and Destination Factors for the colors and the alpha channel, as explained here: http://unity3d.com/support/documentation/Components/SL-Blend.html. I basically need to follow this:

Code (csharp):

1. Blend SrcFactor DstFactor, SrcFactorA DstFactorA

, specifying them differently.

But in my shader it does mot matter what I specify as SrcFactorA and DstFactorA, nothing ever changes at all. I may even set both alpha factors to be multiplied by zero and they still appear on screen!

Here is my shader, I am basically trying to modify mobile/particles/additive:

Code (csharp):

1. Shader "ex2D/BlueHaloAdditive" {
2. Properties {
3.     _MainTex ("Particle Texture", 2D) = "white" {}
4. }
5.  
6. Category {
7.     Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
8.     Blend SrcAlpha One, One oneMinusSrcAlpha
9.     Cull Off
10.     ZWrite Off
11.    
12.     BindChannels {
13.         Bind "Color", color
14.         Bind "Vertex", vertex
15.         Bind "TexCoord", texcoord
16.     }
17.    
18.     SubShader {
19.         Pass {
20.             SetTexture [_MainTex] {
21.                 combine texture * primary
22.             }
23.         }
24.     }
25. }
26. }

The thing is, while I want to blend their colors, I also need to blend the alpha channel but in a different way.
Whatever I put after the comma to specify alpha blending options does not influence anything at all.

Am I doing something wrong? How should I proceed?


Thanks in advance,
Fernando.

 

Yes, if it doesn't work. Because it should work.

 

Same question, i'm trying to apply different operation to alpha channel but is not working, even multiplying alpha by zero.

Code (csharp):

1.  
2. Blend OneMinusSrcColor Zero, Zero Zero
3.  

 

For anyone who finds this in search results, there's a bit of an explanation here: https://answers.unity.com/questions/518893/separate-blend-modes-for-alpha-and-color.html