//测试viewDir对顶点的影响
Shader "Example/TestViewDir" {

	Properties{

		_RimColor("Rim Color", Color) = (0.26,0.19,0.16,0.0)

		_RimPower("Rim Power", Range(0.5,8.0)) = 3.0

	}

	SubShader{

		Tags{ "RenderType" = "Opaque" }

		CGPROGRAM

		#pragma surface surf Lambert

			struct Input {

			float2 uv_MainTex;

			float2 uv_BumpMap;

			float3 viewDir;

		};

		sampler2D _MainTex;

		sampler2D _BumpMap;

		float4 _RimColor;

		float _RimPower;

		float _Test;

		void surf(Input IN, inout SurfaceOutput o) {

			half rim = 1 - saturate(dot(o.Normal,normalize(IN.viewDir)));

			float3 col = _RimColor.rgb * pow(rim, _RimPower);

			float4 c = float4(col, rim);

			o.Emission = c;

		}

		ENDCG

	}

	Fallback "Diffuse"

}

结果：最终输出颜色*ColorMask后再与屏幕上颜色进行混合叠加

Shader "Example/ColorMask" {

	Properties{

		_Color("Texture to blend", Color) = (1,1,1,1)

	}

	SubShader{

		Tags{ "Queue" = "Transparent" }

		ColorMask B

		Pass{

			Blend SrcColor one

			CGPROGRAM

			#include "UnityCG.cginc"

			#pragma vertex vert

			#pragma fragment frag

			float4 _Color;

			float4 vert(appdata_base v) : POSITION

			{

				return mul(UNITY_MATRIX_MVP, v.vertex);

			}

			float4 frag(float4 pos:POSITION) : COLOR

			{

				return _Color;

			}

			ENDCG

		}

	}

	Fallback Off

}