如何抵消Unity着色器中的正常UV？

Question

我有這個着色器以給定的速度偏移紋理（模擬水流，熔岩，通常的東西）。它工作正常，除了正常的紋理，由於某些原因，即使我使用相同的代碼也不會抵消。任何人都能看到爲什麼當應用於對象時，主紋理會滾動，但法線保持在同一位置。

Shader "mrpmorris/Scrolling shader" { 
    Properties{ 
     _MainTint("Diffuse tint", Color) = (1,1,1,1) 
     _MainTex("Base (RGB)", 2D) = "white" {} 
     _NormalTex("Normap map", 2D) = "bump" {} 
     _ScrollXSpeed("X scroll speed", Range(-10, 10)) = 0 
     _ScrollYSpeed("Y scroll speed", Range(-10, 10)) = -0.4 
    } 
    SubShader{ 
     Tags { "RenderType" = "Opaque" } 
     LOD 200 

     CGPROGRAM 
     // Physically based Standard lighting model, and enable shadows on all light types 
     #pragma surface surf Standard fullforwardshadows 

     // Use shader model 3.0 target, to get nicer looking lighting 
     #pragma target 3.0 

     fixed4 _MainTint; 
     fixed _ScrollXSpeed; 
     fixed _ScrollYSpeed; 
     sampler2D _MainTex; 
     sampler2D _NormalTex; 

     struct Input { 
      float2 uv_MainTex; 
      float2 uv_NormalTex; 
     }; 

     void surf(Input IN, inout SurfaceOutputStandard o) { 
      fixed offsetX = _ScrollXSpeed * _Time; 
      fixed offsetY = _ScrollYSpeed * _Time; 
      fixed2 offsetUV = fixed2(offsetX, offsetY); 

      fixed2 normalUV = IN.uv_NormalTex + offsetUV; 
      fixed2 mainUV = IN.uv_MainTex + offsetUV; 

      float4 normalPixel = tex2D(_NormalTex, normalUV); 
      float3 n = UnpackNormal(normalPixel); 
      float4 c = tex2D(_MainTex, mainUV); 

      o.Albedo = c.rgb * _MainTint; 
      o.Normal = n.xyz; 
      o.Alpha = c.a; 
     } 
     ENDCG 
    } 
    FallBack "Diffuse" 
} 

Answer 1

它看起來法線貼圖實際上是旋轉的，但是因爲我已經將法線上的材質上的貼圖設置爲與主紋理上的貼圖不同，所以它移動得非常緩慢以至於看起來不動。

Answer 2

這工作對我來說，不知道爲什麼在你的最終不......順便說一句，我會使用基本獲得更多的控制權，如下所示：

Shader "Custom/ScrollingShader" { 
    Properties{ 
     _Color("Color", Color) = (1,1,1,1) 
     _MainTex("Albedo (RGB)", 2D) = "white" {} 
     _NormalTex("Normap map", 2D) = "bump" {} 
     _Glossiness("Smoothness", Range(0,1)) = 0.5 
     _Metallic("Metallic", Range(0,1)) = 0.0 
     _ScrollXSpeed("X scroll speed", Range(-10, 10)) = 0 
     _ScrollYSpeed("Y scroll speed", Range(-10, 10)) = -0.4 } 
     SubShader{ 
      Tags { "RenderType" = "Opaque" } 
      LOD 200 

      CGPROGRAM 
     // Physically based Standard lighting model, and enable shadows on all light types 
     #pragma surface surf Standard fullforwardshadows 

     // Use shader model 3.0 target, to get nicer looking lighting 
     #pragma target 3.0 

     sampler2D _MainTex; 
     sampler2D _NormalTex; 
     fixed _ScrollXSpeed; 
     fixed _ScrollYSpeed; 

     struct Input { 
      float2 uv_MainTex; 
      float2 uv_NormalTex; 
     }; 

     half _Glossiness; 
     half _Metallic; 
     fixed4 _Color; 

     void surf(Input IN, inout SurfaceOutputStandard o) { 
      fixed offsetX = _ScrollXSpeed * _Time; 
      fixed offsetY = _ScrollYSpeed * _Time; 
      fixed2 offsetUV = fixed2(offsetX, offsetY); 

      fixed2 normalUV = IN.uv_NormalTex + offsetUV; 
      fixed2 mainUV = IN.uv_MainTex + offsetUV; 

      // Albedo comes from a texture tinted by color 
      fixed4 c = tex2D(_MainTex, mainUV) * _Color; 
      o.Albedo = c.rgb; 

      float4 normalPixel = tex2D(_NormalTex, normalUV); 
      float3 n = UnpackNormal(normalPixel); 
      o.Normal = n.xyz; 

      // Metallic and smoothness come from slider variables 
      o.Metallic = _Metallic; 
      o.Smoothness = _Glossiness; 
      o.Alpha = c.a; 
     } 
     ENDCG 
    } 
     FallBack "Diffuse" 
}