Black Vertex Colored Particles =[

Unity Engine
1

I have a texture which is generated procedurally at runtime. This texture is then applied to a procedurally created quad for use as a particle in my own particle system I am developing.

The quad mesh has vertex colors set by code. And when combined with this simple shader (below) it works as expected, if I make all the vertex colors red, I get a red texture.

What is frustrating is that I cannot get BLACK particles to show up! Like smoke, even though the alpha is set to 1 (255) in my vertex colors, the black RGB vertex colors cause the whole thing to become transparent…

Shader "Particles/Custom"{
 
       Properties{
           _MainTex ("Particle Texture", 2D) = "white" {}
       }
 
       Category{
           Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
           Blend SrcAlpha One
           Cull Off Lighting Off ZWrite Off Fog {Color (0,0,0,0)}
 
           BindChannels{
               Bind "Color", color
               Bind "Vertex", vertex
               Bind "TexCoord", texcoord
           }
 
           SubShader{
               Pass{
              SetTexture [_MainTex]{
              combine texture * primary
          }
         }
       }
    }
}

I think what I need to do is read the alpha information from _MainTex.a and multiply _MainTex.rgb with my vertex colors, but shaders have never been my strong point! If anyone could throw me a bone here that would be great.

I don’t want to use the other built in shaders like multiply, that’s not the result i’m looking for. In the end I want to use the vertex colors to fake lighting effects…

It states in the documentation:

"Separate Alpha Color computation By default, the combiner formula is used for calculating both the RGB and alpha component of the color. Optionally, you can specify a separate formula for the alpha calculation. This looks like this:
SetTexture [_MainTex] { combine previous * texture, previous + texture }
Here, we multiply the RGB colors and add the alpha."

I changed my combiner line to this but it hasn’t really helped, then again, I have no idea what I’m doing…

2

Ignore this thread, moment of stupidity exhaustion.