本文例項為大家分享了Unity Shader實現素描風格的具體程式碼，供大家參考，具體內容如下

原理

使用6張素描紋理進行渲染，在渲染階段，在頂點著色階段計算逐頂點的光照，根據光照結果決定6張紋理的混合權重，並傳遞給片元著色器。在片元著色器中根據這些權重來混合6張紋理的取樣結果

Shader實現

Shader "Hatching" 
{
 Properties {
 _Color ("Color Tint",Color) = (1,1,1)//顏色
 _TileFactor ("Tile Factor",Float) = 1//紋理的平鋪係數，數值越大素描線條越密
 _Outline ("Outline",Range(0,1)) = 0.1
 _Hatch0 ("Hatch 0",2D) = "white" {}
 _Hatch1 ("Hatch 1",2D) = "white" {}
 _Hatch2 ("Hatch 2",2D) = "white" {}
 _Hatch3 ("Hatch 3",2D) = "white" {}
 _Hatch4 ("Hatch 4",2D) = "white" {}
 _Hatch5 ("Hatch 5",2D) = "white" {}//對應的6張素描紋理
 }
 
 SubShader {
 Tags { "RenderType"="Opaque" "Queue"="Geometry"}
 
 
 Pass {
  Tags { "LightMode"="ForwardBase" }
  
  CGPROGRAM
  
  #pragma vertex vert
  #pragma fragment frag 
  
  #pragma multi_compile_fwdbase
  
  #include "UnityCG.cginc"
  #include "Lighting.cginc"
  #include "AutoLight.cginc"
  #include "UnityShaderVariables.cginc"
  
  fixed4 _Color;
  float _TileFactor;
  sampler2D _Hatch0;
  sampler2D _Hatch1;
  sampler2D _Hatch2;
  sampler2D _Hatch3;
  sampler2D _Hatch4;
  sampler2D _Hatch5;
  
  struct a2v {
  float4 vertex : POSITION;
  float4 tangent : TANGENT; 
  float3 normal : NORMAL; 
  float2 texcoord : TEXCOORD0; 
  };
  
  struct v2f {
  float4 pos : SV_POSITION;
  float2 uv : TEXCOORD0;
  fixed3 hatchWeights0 : TEXCOORD1;//
  fixed3 hatchWeights1 : TEXCOORD2;// 6個混合權重，存在兩個fixed3變數中
  float3 worldPos : TEXCOORD3;
  SHADOW_COORDS(4)
  };
  
  v2f vert(a2v v) {
  v2f o;
  
  o.pos = UnityObjectToClipPos(v.vertex);
  
  o.uv = v.texcoord.xy * _TileFactor;
  
  fixed3 worldLightDir = normalize(WorldSpaceLightDir(v.vertex));
  fixed3 worldNormal = UnityObjectToWorldNormal(v.normal);
  fixed diff = max(0,dot(worldLightDir,worldNormal));//漫反射係數
  
  o.hatchWeights0 = fixed3(0,0);
  o.hatchWeights1 = fixed3(0,0);
  
  float hatchFactor = diff * 7.0;//把diff縮放到[0,7]範圍
  
  //純白
  if (hatchFactor > 6.0) 
  {
 
  } else if (hatchFactor > 5.0) {
   o.hatchWeights0.x = hatchFactor - 5.0;
  } else if (hatchFactor > 4.0) {
   o.hatchWeights0.x = hatchFactor - 4.0;
   o.hatchWeights0.y = 1.0 - o.hatchWeights0.x;
  } else if (hatchFactor > 3.0) {
   o.hatchWeights0.y = hatchFactor - 3.0;
   o.hatchWeights0.z = 1.0 - o.hatchWeights0.y;
  } else if (hatchFactor > 2.0) {
   o.hatchWeights0.z = hatchFactor - 2.0;
   o.hatchWeights1.x = 1.0 - o.hatchWeights0.z;
  } else if (hatchFactor > 1.0) {
   o.hatchWeights1.x = hatchFactor - 1.0;
   o.hatchWeights1.y = 1.0 - o.hatchWeights1.x;
  } else {
   o.hatchWeights1.y = hatchFactor;
   o.hatchWeights1.z = 1.0 - o.hatchWeights1.y;
  }
  
  o.worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;
  
  TRANSFER_SHADOW(o);
  
  return o; 
  }
  
  fixed4 frag(v2f i) : SV_Target 
  {  //根據相應的權重進行取樣
  fixed4 hatchTex0 = tex2D(_Hatch0,i.uv) * i.hatchWeights0.x;
  fixed4 hatchTex1 = tex2D(_Hatch1,i.uv) * i.hatchWeights0.y;
  fixed4 hatchTex2 = tex2D(_Hatch2,i.uv) * i.hatchWeights0.z;
  fixed4 hatchTex3 = tex2D(_Hatch3,i.uv) * i.hatchWeights1.x;
  fixed4 hatchTex4 = tex2D(_Hatch4,i.uv) * i.hatchWeights1.y;
  fixed4 hatchTex5 = tex2D(_Hatch5,i.uv) * i.hatchWeights1.z;
  fixed4 whiteColor = fixed4(1,1) * (1 - i.hatchWeights0.x - i.hatchWeights0.y - i.hatchWeights0.z - 
    i.hatchWeights1.x - i.hatchWeights1.y - i.hatchWeights1.z);
  
  fixed4 hatchColor = hatchTex0 + hatchTex1 + hatchTex2 + hatchTex3 + hatchTex4 + hatchTex5 + whiteColor;
  
  UNITY_LIGHT_ATTENUATION(atten,i,i.worldPos);
    
  return fixed4(hatchColor.rgb * _Color.rgb * atten,1.0);
  }
  
  ENDCG
 }
 }
 FallBack "Diffuse"
}

效果如下：

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。