本文实例为大家分享了Unity Shader实现素描效果的具体代码，供大家参考，具体内容如下

这是乐乐大佬书里的非真实渲染，其中的算法还是挺有意思的，感兴趣的小伙伴可以试一试。

素描效果基本原理：先将物体进行描边画出轮廓，计算物体的漫反射部分，漫反射越暗表明颜色越暗，然后根据漫反射的值来设置采样贴图的权重。

采样贴图：

shader部分：

Shader "Unlit/Sketch"{ Properties { _Color("Color",Color) = (1,1,1,1) //贴图平铺系数 _TileFactor("TileFactor", Range(0, 10)) = 1 _Hatch0("Hatch0",2D)="white"{} _Hatch1("Hatch1",2D) = "white"{} _Hatch2("Hatch2",2D) = "white"{} _Hatch3("Hatch3",2D) = "white"{} _Hatch4("Hatch4",2D) = "white"{} _Hatch5("Hatch5",2D) = "white"{} //描边系数 _OutlineFactor("OutlineFactor",Range(0.0,0.1))=0.01 } SubShader { Tags{ "Queue" = "Transparent" } //描边使用两个Pass，第一个pass沿法线挤出一点，只输出描边的颜色 Pass { //剔除正面，只渲染背面 Cull Front //关闭深度写入 ZWrite Off //控制深度偏移，描边pass远离相机一些，防止与正常pass穿插 Offset 1,1 CGPROGRAM #include "UnityCG.cginc" #pragma vertex vert #pragma fragment frag float _OutlineFactor; struct v2f { float4 pos : SV_POSITION; }; v2f vert(appdata_full v) { v2f o; o.pos = UnityObjectToClipPos(v.vertex); //将法线方向转换到视空间 float3 vnormal = mul((float3x3)UNITY_MATRIX_IT_MV, v.normal); //将视空间法线xy坐标转化到投影空间 float2 offset = TransformViewToProjection(vnormal.xy); //在最终投影阶段输出进行偏移操作 o.pos.xy += offset * _OutlineFactor; return o; } fixed4 frag(v2f i) : SV_Target { return float4(0,0,0,1); } ENDCG } Pass { CGPROGRAM #include "UnityCG.cginc" #include "Lighting.cginc" //使用阴影需添加 #include "AutoLight.cginc" #pragma vertex vert #pragma fragment frag //使主要平行光产生阴影 #pragma multi_compile_fwdbase float4 _Color; float _TileFactor; sampler2D _Hatch0; sampler2D _Hatch1; sampler2D _Hatch2; sampler2D _Hatch3; sampler2D _Hatch4; sampler2D _Hatch5; struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; //6张依次加深的贴图 float3 hatchWeights0:TEXCOORD1; float3 hatchWeights1:TEXCOORD2; //声明阴影 SHADOW_COORDS(4) float3 worldPos:TEXCOORD3; }; v2f vert (appdata_full v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); //平铺系数越大，显示的贴图越密集 o.uv = v.texcoord* _TileFactor; float3 worldLightDir = normalize(WorldSpaceLightDir(v.vertex)); float3 worldNormal = UnityObjectToWorldNormal(v.normal); //漫反射 float diffuse = max(0, dot(worldLightDir, worldNormal)); o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz ; //六张图片的权重 o.hatchWeights0 = float3(0, 0, 0); o.hatchWeights1 = float3(0, 0, 0); //根据漫反射值计算权重，漫反射越暗，线条越密集 float hatchFactor = diffuse * 7.0; 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; } //把计算的阴影传到fragment中 TRANSFER_SHADOW(o); return o; } fixed4 frag (v2f i) : SV_Target { float4 hatchTex0 = tex2D(_Hatch0, i.uv) * i.hatchWeights0.x; float4 hatchTex1 = tex2D(_Hatch1, i.uv) * i.hatchWeights0.y; float4 hatchTex2 = tex2D(_Hatch2, i.uv) * i.hatchWeights0.z; float4 hatchTex3 = tex2D(_Hatch3, i.uv) * i.hatchWeights1.x; float4 hatchTex4 = tex2D(_Hatch4, i.uv) * i.hatchWeights1.y; float4 hatchTex5 = tex2D(_Hatch5, i.uv) * i.hatchWeights1.z; //漫反射暗色部分权重越大，白色越少 float4 whiteColor = float4(1, 1, 1, 1)*(1 - i.hatchWeights0.x - i.hatchWeights0.y - i.hatchWeights0.z - i.hatchWeights1.x - i.hatchWeights1.y - i.hatchWeights1.z); float4 hatchColor = hatchTex0 + hatchTex1 + hatchTex2 + hatchTex3 + hatchTex4 + hatchTex5+ whiteColor; //使物体接受阴影 UNITY_LIGHT_ATTENUATION(atten, i, i.worldPos); return float4(hatchColor.rgb*_Color.rgb*atten, 1.0); } ENDCG } }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。