Stencil Shader and iOS

Hi !

Since a the new UI we use Stencil Shader to display 3D elements in UI or 2D arrays.

I always used this shader :

Code (CSharp):

1. Shader "Stencils/Diffuse" {
2.     Properties {
3.         _StencilId ("Stencil ID", Float) = 0
4.         _MainTex ("Base (RGB)", 2D) = "white" {}
5.         _Color ("Main Color", COLOR) = (0.58,0.58,0.58,1)
6.     }
7.     SubShader {
8.         Stencil {
9.             Ref [_StencilId]
10.             Comp equal
11.             Pass keep
12.             Fail keep
13.         }
14.  
15.         Tags { "RenderType"="Opaque" "Queue"="Transparent+100"}
16.         LOD 200
17.         Cull Off
18.    
19.         CGPROGRAM
20.         #pragma surface surf Lambert
21.  
22.         sampler2D _MainTex;
23.         float4 _Color;
24.    
25.         struct Input {
26.             float2 uv_MainTex;
27.             float4 color : COLOR;
28.         };
29.  
30.         void surf (Input IN, inout SurfaceOutput o) {
31.             half4 c = tex2D (_MainTex, IN.uv_MainTex);
32.             o.Albedo = c.rgb * _Color.rgb;
33.             o.Alpha = c.a;
34.         }
35.         ENDCG
36.     }
37.     FallBack "Diffuse"
38. }

But now on iOS (iPad Air) it renders black since I use Asset Bundle. I know Asset Bundle have issue with custom shaders, you need to add them in the built-in shader, but the shader is added.

And more strange : My asset have two parts, both with this shader : one is rendered correctly, the other is black. To be more precise, it's a boat : The boat is correctly renderer, the sails is not (it's just a plane, one sided)

When I debug the material, the shader is here, the color is here, the texture is here, it's just not rendered.

I know that some custom shader doesn't work with iOS metal, usually I use shader force and check "iOS metal compatible", but I can't open this one on shader forge so i'm lost...

Anyone have an idea ?

[Unity 5.2.2p3]