→ 逐顶点:像素漫反射光照

birdnofoot · Jan 11, 2017 · d4052a3 · d4052a3
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diff --git a/UnityShader/逐顶点:像素漫反射光照/MatShader007/MatDiffusePixel.mat b/UnityShader/逐顶点:像素漫反射光照/MatShader007/MatDiffusePixel.mat
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diff --git a/UnityShader/逐顶点:像素漫反射光照/MatShader007/MatDiffuseVertex.mat b/UnityShader/逐顶点:像素漫反射光照/MatShader007/MatDiffuseVertex.mat
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diff --git a/UnityShader/逐顶点:像素漫反射光照/README.md b/UnityShader/逐顶点:像素漫反射光照/README.md
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+# 逐顶点/像素漫反射光照
+
+漫反射光照符合兰伯特定律 : 反射光线的强度 与 表面法线 和 光源方向 之间的夹角的余弦值成正比 .
+
+计算机图形第一定律 : 如果它看起来是对的 , 那么它就是对的 .
+
+逐顶点光照的计算量往往要小于逐像素光照 .
+
+逐顶点光照依赖于线性插值来得到像素光照 , 当光照模型中有非线性的计算的时候 , 逐顶点光照就会出问题 , 例如计算高光反射 .
+
+逐顶点光照会在渲染图元内部对顶点进行插值 , 渲染图元内部的颜色总是暗于顶点处的最高颜色 , 在某些情况下会产生明显的棱角现象 .
+
+```c
+// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
+
+Shader "Custom/DiffuseVertexLevel" {
+
+	Properties {
+		_Diffuse("Diffuse", Color) = (1, 1, 1, 1)
+	}
+
+	SubShader {
+		Pass {
+			Tags { "LightMode"="ForwardBase" }
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#include "Lighting.cginc"
+
+			fixed4 _Diffuse;
+
+			struct a2v {
+				float4 vertex : POSITION;
+				float3 normal : NORMAL;
+			};
+
+			struct v2f {
+				float4 pos : SV_POSITION;
+				fixed3 color : COLOR;
+			};
+
+			// 逐顶点的漫反射光照
+			v2f vert(a2v v) {
+				v2f o;
+				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
+				fixed3 worldNormal = normalize(mul(v.normal, (float3x3)unity_WorldToObject));
+				fixed3 worldLight = normalize(_WorldSpaceLightPos0.xyz);
+				fixed3 diffuse = _LightColor0.rgb * _Diffuse.rgb * saturate(dot(worldNormal, worldLight));
+				o.color = ambient + diffuse; // 环境光 + 漫射光
+				return o;
+			}
+
+			fixed4 frag(v2f f) : SV_Target {
+				return fixed4(f.color, 1.0);
+			}
+
+			ENDCG
+		}
+	}
+	FallBack "Diffuse"
+}
+
+```
+
+逐像素光照可以得到更加平滑的光照效果 , 但是有一个问题存在 : 当光照无法到达的区域 , 模型的外观通常是全黑的 , 没有任何的额明暗变化 , 失去了模型细节表现 , 因此有一种改善技术提出 , 即 , 半兰布特光照模型(没有任何物理依据 , 只是一个视觉加强技术) .
+
+```c
+Shader "Custom/DiffusePixelLevel" {
+
+	Properties {
+		_Diffuse("Diffuse", Color) = (1,1,1,1)
+	}
+
+	SubShader {
+		Pass {
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#include "Lighting.cginc"
+
+			fixed4 _Diffuse;
+
+			struct a2v {
+				float4 vertex : POSITION;
+				float3 normal : NORMAL;
+			};
+
+			struct v2f {
+				float4 pos : SV_POSITION;
+				float3 worldNormal : TEXCOORD0;
+			};
+
+			v2f vert(a2v v) {
+				v2f o;
+				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
+				o.worldNormal = mul(v.normal, (float3x3)_World2Object);
+				return o;
+			}
+
+			// 逐像素漫反射光照
+			fixed4 frag(v2f f) : SV_Target {
+				fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT.xyz;
+				fixed3 worldNormal = normalize(f.worldNormal);
+				fixed3 worldLightDir = normalize(_WorldSpaceLightPos0.xyz);
+				fixed3 diffuse = _LightColor0 * _Diffuse.rgb * (dot(worldNormal, worldLightDir) * 0.5 + 0.5); // 半兰伯特光照模型
+				fixed3 color = ambient + diffuse;
+				return fixed4(color, 1.0);
+			}
+
+			ENDCG
+		}
+	}
+	FallBack "Diffuse"
+}
+
+```
+End.