How to use my AlphaTest value in my surface shader ?

Hi all,

I wanna use my variable _Cutoff in my surfaceshader, but how i can fix these issues ?

Code (csharp):

1.  
2. Properties
3. {
4.    ....
5.     _Cutoff ("Alpha cutoff", Range (0,1)) = 0
6.    ....
7. }
8.  
9. SubShader
10.     {
11.       Tags { "Queue" = "Geometry" }
12.    
13.    
14.       CGPROGRAM
15.       #pragma target 3.0
16.       #pragma surface surf SimpleSpecular vertex:vert alphatest:_Cutoff
17.  
18.      uniform float _Cutoff;
19.      ....
20.   }
21.  

The compiler displays :

"Program 'vert_surf', declaration of "_Cutoff" conflicts with previous declaration at (45) at line 197"
"Program 'frag_surf', declaration of "_Cutoff" conflicts with previous declaration at (45) at line 197"
"GLSL vertex shader: ERROR: 0:467: '_Cutoff' : redefinition at line 23"

If I remove this line : uniform float _Cutoff;
The compiler doesn't know this variable ...


Thus what's wrong in my code ?

Thanks in advance !

 

Strange.

In your surface shader surf function, try using...

Code (csharp):

1. clip(s.Alpha - _Cutoff);

...and removing the alphatest:_Cutoff argument.

As far as I can tell it does exactly the same thing.

 

It appears the compiler is complaining because _Cutoff is defined by the surface shader pragma as well.
Remove "uniform float _Cutoff;" and it should work.