lerp textures iOS 6

Hi,

I would like to lerp textures in a shader depending on the world position. My shader works so far in the editor and on iOS 5.1.1 but on iOS 6 the bottom texture (_SecondTex) is not visible.

@edit the second texture is not 'not visible', it's just black.

Code (csharp):

1. Shader "Custom/TestShader" {
2.     Properties {
3.         _MainTex("Top", 2D) = "white" {}
4.         _SecondTex("Bottom", 2D) = "white" {}
5.     }
6.     SubShader {
7.         Tags { "RenderType"="Opaque" }
8.         LOD 200
9.        
10.         CGPROGRAM
11.         #pragma surface surf Lambert
12.        
13.         sampler2D _MainTex;
14.         sampler2D _SecondTex;
15.  
16.         struct Input {
17.             float2 uv_MainTex;
18.             float2 uv_SecondTex;
19.             float3 worldPos;
20.         };
21.  
22.         void surf (Input IN, inout SurfaceOutput o) {
23.        
24.             float4 Tex2D0 = tex2D(_MainTex, IN.uv_MainTex);
25.             float4 Tex2D1 = tex2D(_SecondTex, IN.uv_SecondTex);
26.            
27.             float4 Lerp0 = lerp(Tex2D1, Tex2D0, clamp(IN.worldPos.y * 10, 0, 1));
28.        
29.             o.Albedo = Lerp0.rgb;
30.             o.Alpha = Lerp0.a;
31.         }
32.         ENDCG
33.     }
34.     FallBack "Diffuse"
35. }

Did I do something wrong or is there an issue on iOS6?

I also tried to use ShaderLab but don't know how to get the world position then.

 

I just figured out that this only happens when the player setting 'orientation' is set to landscape. When portrait mode is set, it also works on ios6.

Bug report sent

 

Okay, it's case 533786

 

You're right, it works with Unity 4.1. Thank you very much for your support!