Shader stopped working in Unity 5

Unity Engine
1

Hey guys, we’re having a problem with a shader we used in Unity 4.6 and now that we upgraded to Unity 5 it stopped working. I looked around but any of the suggested fixes I found to similar problems didn’t help us. The shader is used as a green screen meaning that the specified color in a video texture should be set transparent but after the upgrade all colors are drawn normally. Any help would be appreciated!

Here’s the shader:

Shader "green_screen" {
    Properties {
        _Color ("Main Color", Color) = (1,1,1,1)
        _MainTex ("Base (RGBA)", 2D) = "white" {}
        _ColorToReplace ("_ColorToReplace", Color) = (0,0.6,0,1)

        threshold_sensitivity ("threshold_sensitivity", Range (0.0,1.0)) = 0.21
        smoothing ("smoothing", Range (0.0,1.0)) = 0.05
    }
    SubShader {
       Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
        LOD 200
        Blend SrcAlpha OneMinusSrcAlpha
       
        CGPROGRAM
        #pragma surface surf Lambert

        struct Input {
            float2 uv_MainTex;
          };
         
        sampler2D _MainTex;
        fixed4 _Color;
        fixed4 _ColorToReplace;
        float threshold_sensitivity,smoothing;
       
        void surf (Input IN, inout SurfaceOutput o) {
            float2 xy = float2(IN.uv_MainTex.x,  IN.uv_MainTex.y);
            float4 textureColor = tex2D (_MainTex, xy);
            float maskY = 0.2989 * _ColorToReplace.r + 0.5866 * _ColorToReplace.g + 0.1145 * _ColorToReplace.b;
             float maskCr = 0.7132 * (_ColorToReplace.r - maskY);
             float maskCb = 0.5647 * (_ColorToReplace.b - maskY);
    
             float Y = 0.2989 * textureColor.r + 0.5866 * textureColor.g + 0.1145 * textureColor.b;
             float Cr = 0.7132 * (textureColor.r - Y);
             float Cb = 0.5647 * (textureColor.b - Y);
    
    
             float blendValue = smoothstep(threshold_sensitivity, threshold_sensitivity + smoothing, distance(float2(Cr, Cb), float2(maskCr, maskCb)));
           
            o.Albedo = textureColor.rgb * _Color.rgb;
            o.Alpha = textureColor.a * blendValue * _Color.a;
        }
        ENDCG
    }
    Fallback "Diffuse"
}
2

Check your import settings for the texture, it might not have upgraded with the transparency, it should show in the preview.

3

I checked them, but everything seems to be as it should. I also made an entirely new project and reimported the shader and texture but the shader is not working. Did you try the shader succesfully or was that just a hunch that it might be about the import settings? Thanks for trying to help!

4

Just a hunch! Send me your textures and I’ll have a look.

5

Well the shader should work on any texture. And it does in Unity 4.6. You just set the ColorToReplace parameter to the color you want to have transparent.