Need help getting alpha in a simple shader

Hi there,
I have this simple shader that is just a solid color but I'd also like it to have transparency.

Code (csharp):

1. Shader "Petes/Solid Color" {
2.  
3.     properties{
4.     _Color ("Solid Color",Color) = (0,0,0,0)   
5.     }
6.         subshader{
7.         Cull Off
8.         color [_Color] 
9.         pass{}
10.     }
11. }

Could someone help me add that in?
Thanks, I'm still pretty average at the whole shader thing...

Pete

 

I'm still stuck with this one, does anyone know how I could get the transparency working here?
I thought since I added the extra alpha section in here that it would allow me to use tranparency but it still doesnt work Color) = (0,0,0,0)

 

http://unity3d.com/support/documentation/Components/SL-AlphaTest.html

also have a look to: http://unity3d.com/support/documentation/Components/SL-Blend.html (usually you can use "Blend SrcAlpha OneMinusSrcAlpha")

 

Hey thanks arioch82
The alpha is playing a part in the texture now but I it doesn't seem to play nice zdepth wise. Some objects appear in front but it seems okay with other objects... I tried the ztest option and I've included ZWrite but it cant get it to look right.
Any ideas?

Code (csharp):

1.  
2. Shader "Petes/Solid Color" {
3.  
4.     properties{
5.     _Color ("Solid Color",color) = (0,0,0,0)   
6.     }
7.         subshader{
8.         Cull Off
9.         ZWrite On
10.         color [_Color] 
11.         pass{
12.                 Blend SrcAlpha OneMinusSrcAlpha
13.             }
14.         }
15. }

Thanks
Pete

 

Hi Pete,

I'm quite new to the shader programming (I'm approaching them for the first time just in these days), i know how to apply an alpha from a texture but not to a solid color from a float sorry

 

Try this;

Code (csharp):

1.  
2. Shader "Petes/Solid Color"
3. {
4.     Properties
5.     {
6.         _Color ("Solid Color",color) = (0,0,0,0)   
7.     }
8.     Category
9.     {
10.    
11.         Tags {"Queue"="Transparent"}
12.         ZWrite Off
13.         Blend SrcAlpha OneMinusSrcAlpha
14.  
15.         Subshader
16.         {
17.             color [_Color] 
18.             Pass {}
19.         }
20.     }
21. }

I took the liberty of changing the indentation it a bit .

The secret is the Tags {"Queue"="Transparent"} line, which tells unity to draw the object in the transparent queue. This makes sure it is drawn with the other transparent objects, in back-to-front order.

 

cool thanks tomvds! That works great!

 

There's no need to use quotes in the Tag unless you're using a custom queue, and Category is only useful when you have multiple SubShaders.

Code (csharp):

1. Shader "Petes/Solid Transparent Color" {
2.  
3. Properties {
4.     _Color ("Solid Color (A = Opacity)", Color) = (0,0,0,1)
5. }
6.  
7. Subshader {
8.     Tags {Queue = Transparent}
9.     ZWrite Off
10.     Blend SrcAlpha OneMinusSrcAlpha
11.    
12.     Color [_Color] 
13.     Pass {}
14. }
15.  
16. }

More info about alpha blending / queues here, if you're interested.

 

Thanks Jessy, that's great!