Question by greggman · Dec 06, 2013 at 07:13 AM · lighting shaders bugs

Why does lighting stop working on just one machine?

I wrote a custom shader, pasted below.

2 of my colleagues are using the shader and suddenly lighting has stopped working for just one of them. We are both running 4.3.1F1, We are both running on Retina MacbookPros with NVIDIA GeForce GT 650M GPUs. He's in OSX 10.7.4, I'm in 10.8.

We've narrowed it down to

Blend SrcAlpha OneMinusSrcAlpha

If I comment that line out in the shader lighting suddenly works on his machine. It works with or without that line in mine.

How can we fix his version of Unity, what setting needs to be fixed or whatever, so it starts working or any other ideas why the difference?

Here's the full shader

 Shader "Greggman/GmanLinesCullBack" {
     Properties {
       _LineColor ("EdgeColor", Color) = (1, 1, 1, 1)
       _FillColor ("FillColor", Color) = (0, 0, 0, 0)
       _EdgeThickness ("EdgeThickness", Float) = 0.1
       _Scale ("Scale", Float) = 1
       _MainTex ("Base (RGB)", 2D) = "white" {}
     }
     SubShader {
         Tags { "RenderType"="Opaque" }
         LOD 200
         Lighting On
         Blend SrcAlpha OneMinusSrcAlpha
         Cull Back
 
         CGPROGRAM
         #pragma surface surf Lambert
 
         sampler2D _MainTex;
         float4 _LineColor;
         float4 _FillColor;
         float _Scale;
         float _EdgeThickness;
 
         struct Input {
             float2 uv_MainTex;
         };
 
         void surf (Input IN, inout SurfaceOutput o) {
              half4 t = tex2D (_MainTex, IN.uv_MainTex);
             half4 c = _FillColor;
             float v = frac(IN.uv_MainTex.y * _Scale);
             if (v < _EdgeThickness) {
               c = _LineColor;
             }
             o.Albedo = c.rgb;
             o.Alpha = c.a * t.a;
         }
         ENDCG
     } 
     FallBack "Diffuse"
 }

And here's screenshots from his machine vs mine. Same file, same project

His (where'd lighting go?)

alt text