地形混合shader

1.四个贴图混合

 1 Shader "Custom/BlendTex_surface" {
 2     Properties {
 3         _RTexture("Red Channel Texture", 2D) = "" {}
 4         _GTexture("Green Channel Texture", 2D) = "" {}
 5         _BTexture("Blue Channel Texture", 2D) = "" {}
 6         _ATexture("Alpha Channel Texture", 2D) = "" {}
 7         _Mask("Mask(RG)",2D) = ""{}
 8     }
 9     SubShader {
10         Tags { "RenderType"="Opaque" }
11         LOD 200
12         
13         CGPROGRAM
14         #pragma surface surf Lambert
15         #pragma target 4.0
16 
17         sampler2D _RTexture;
18         sampler2D _GTexture;
19         sampler2D _BTexture;
20         sampler2D _ATexture;
21 
22         sampler2D _Mask;
23 
24         struct Input {
25             float2 uv_RTexture;
26             float2 uv_GTexture;
27             float2 uv_BTexture;
28             float2 uv_ATexture;
29             float2 uv_Mask;
30         };
31 
32         void surf (Input IN, inout SurfaceOutput o) {
33             float4 rTexData = tex2D(_RTexture, IN.uv_RTexture);
34             float4 gTexData = tex2D(_GTexture, IN.uv_GTexture);
35             float4 bTexData = tex2D(_BTexture, IN.uv_BTexture);
36             float4 aTexData = tex2D(_ATexture, IN.uv_ATexture);
37             float4 blendData = tex2D(_Mask, IN.uv_Mask);
38 
39             float4 finalColor;
40             //根据blendData.g 将 RTexture 和 GTexture 混合
41             finalColor = lerp(rTexData, gTexData, blendData.g);//原本为g
42             //根据blendData.b 将 BTexture 混合
43             finalColor = lerp(finalColor, bTexData, blendData.b);//原本为b
44             //根据blendData.a 将 ATexture 混合
45             finalColor = lerp(finalColor, aTexData , blendData.a);//原本为a
46             finalColor = saturate(finalColor);
47             o.Albedo = finalColor.rgb;
48             o.Alpha = finalColor.a;
49         }
50         ENDCG
51     } 
52     FallBack "Diffuse"
53 }

BlendTex_surface