modify default pbr shaders:

hi all!
I need to have at least 6 texture uv in my shader, i'm trying to modify the default shaders: In UnityStandardInput.cginc I've modified VertexInput like this:

Code (CSharp):

1. struct VertexInput
2. {
3.     float4 vertex    : POSITION;
4.     fixed4 vColor    : COLOR;
5.     half3 normal    : NORMAL;
6.     float2 uv0        : TEXCOORD0;
7.     float2 uv1        : TEXCOORD1;
8.     float2 uv2        : TEXCOORD2;
9.     float2 uv3        : TEXCOORD3;
10.     float2 uv4        : TEXCOORD4;
11.     //float2 uv5        : TEXCOORD5;
12. #ifdef _TANGENT_TO_WORLD
13.     half4 tangent    : TANGENT;
14. #endif
15. };

but when the shader compile, gives me this error:

any ideas?
my shader may accept uv from 0 to 5, but maybe that in the mesh there's only 2 uv per vertex...

thanks in advance!

p.s. at the moment the UnityStandardCore.cginc is not modified..

 

https://answers.unity.com/questions/1363106/unknown-input-semantics-texcoord4.html