Vertex shader question

Hi

I found this vert function to simulate billboard facing to camera . It works fine in editor and pc but in Android build doesn't works and fallbacked to diffuse:

What is non supported feature in this code for android device ?

Code (CSharp):

1.     void vert (inout appdata_full v, out Input o)
2.     {
3.  
4.          UNITY_INITIALIZE_OUTPUT(Input, o);
5.         float3 forward = -normalize(UNITY_MATRIX_V._m20_m21_m22);
6.         float3 up = float3(0, 1, 0); //normalize(UNITY_MATRIX_V._m10_m11_m12);
7.         float3 right = normalize(UNITY_MATRIX_V._m00_m01_m02);
8.      
9.         // rotate to face camera
10.         float4x4 rotationMatrix = float4x4(right,   0,
11.                                            up,      0,
12.                                            forward, 0,
13.                                            0, 0, 0, 1);
14.      
15.         //float offset = _Object2World._m22 / 2;
16.         float offset = 0;
17.         v.vertex = mul(v.vertex + float4(0, offset, 0, 0), rotationMatrix) + float4(0, -offset, 0, 0);
18.         v.normal = mul(v.normal, rotationMatrix);
19.  
20.     }

 

Have you tried switching the project to android and reimporting the shader? I sometimes find that shows up some errors, also the build logs of the android build might show errors related to the shader.

 

yes thank you.

Now i got this error:

in this line of the code :

59:
v.normal = mul(v.normal, rotationMatrix);

 

v.normal = mul(v.normal, (float3x3)rotationMatrix);