Shader: Blending multiple textures in CG CODE

Questions & Answers
1

Hi, how I can blend multiple textures in CG CODE ?

Shader properties:

_MainTex ("Base Texture", 2D) = "white" {}
_Texture2 ("Blend Texture 1", 2D) = "white" {}
_Blend1 ("Blend between Base and Blend 1 textures", Range (0, 1) ) = 0 

SubShader {
  Tags { "RenderType"="Opaque" }
  LOD 400
  CGPROGRAM
  #pragma surface surf BlinnPhong

I need bleed _MainTex nad _Texture2 by _Blend1 here in CG CODE

  #pragma target 3.0
  ENDCG
}
2

Simple:

// make sure you declare _MainTex and your other variables under CGPROGRAM
sampler2D _MainTex;
sampler2D _Texture2;
float _Blend1;

struct Input {
float2 uv_MainTex;
};

void surf (Input IN, inout SurfaceOutput o) {
    fixed4 mainCol = tex2D(_MainTex, IN.uv_MainTex);
    fixed4 texTwoCol = tex2D(_Texture2, IN.uv_MainTex);
    fixed4 output = lerp(mainCol, texTwoCol, _Blend1);
    o.Albedo = output.rgb;
    o.Alpha = output.a;
}

Have a look at the CGScript standard library- if you’re familiar with all of those functions (and there’s not that many of them), you’ll be able to do quite a lot with simple shaders.