Shader "Sbin/BlendTexAnimShader"{	Properties	{		_MainTex ("Texture", 2D) = "white" {}		_SecondTex ("Texture", 2D) = "white" {}		_F("F",Range(0,10))=4	}	SubShader	{		Pass		{			colormask rgba				//只准许输出红色 			CGPROGRAM			#pragma vertex vert			#pragma fragment frag			#include "UnityCG.cginc"			sampler2D _MainTex;			sampler2D _SecondTex;			float _F;			struct v2f{				float4 pos:POSITION;				float2 uv:TEXCOORD0;			};			v2f vert (appdata_base v)			{				v2f o;				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);				o.uv = v.texcoord.xy;				return o;			}			fixed4 frag (v2f v) : COLOR			{				//用一张纹理实现：会动的星空效果				//===========================================				//float2 uv = v.uv;				//float offset_uv = 0.05*sin(v.uv*_F + _Time.x*2);				//uv +=offset_uv;				//fixed4 col1 = tex2D(_MainTex, uv);				//uv = v.uv;				//uv -=offset_uv;				//fixed4 col2 = tex2D(_MainTex, uv);				//return (col1+col2)/2;				//===========================================				//使用两张纹理实现：湖面会动的星空效果				//===========================================				//fixed4 mainColor = tex2D(_MainTex, v.uv);				//float offset_uv = 0.05*sin(v.uv*_F + _Time.x*2);				//float2 uv = v.uv + offset_uv;				//fixed4 secondColor = tex2D(_SecondTex, uv);				//mainColor.rgb += secondColor;				//return mainColor/2;				//===========================================				//只输出制定颜色通道				//===========================================				fixed4 mainColor = tex2D(_MainTex, v.uv);				float offset_uv = 0.05*sin(v.uv*_F + _Time.x*2);				float2 uv = v.uv + offset_uv;				fixed4 secondColor = tex2D(_SecondTex, uv);				mainColor.rgb *= secondColor.b;				return mainColor;			}			ENDCG		}	}}