模型部分贴图的贴图流动效果Shader

部分贴图流动效果Shader

Shader "Custom/moveLight 1" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
		//流光图
		_LightTex("Light Texture",2D) = "white"{}
		//遮罩图
		_MaskTex("Mask Texture",2D) = "white"{}
		//流光颜色
		_MoveLightColor("MoveLightColor", Color) = (1,1,1,1)
		//流光uv x轴速度
		_SpeedX("SpeedX", Range(-1,1)) = 0.0
		//流光uv y轴速度
		_SpeedY("SpeedY", Range(-1,1)) = 0.0
		//流光宽度
		_LightWidth("LightWidth",Range(1,20)) = 1
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
 
		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard fullforwardshadows
 
		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0
 
		sampler2D _MainTex;
		sampler2D _LightTex;
		sampler2D _MaskTex;
		float4 _MoveLightColor;
		float _SpeedY;
		float _SpeedX;
		float _LightWidth;
 
		struct Input 
		{
			float2 uv_MainTex;
		};
 
		half _Glossiness;
		half _Metallic;
		fixed4 _Color;
 
		// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
		// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
		// #pragma instancing_options assumeuniformscaling
		UNITY_INSTANCING_BUFFER_START(Props)
			// put more per-instance properties here
		UNITY_INSTANCING_BUFFER_END(Props)
 
		void surf (Input IN, inout SurfaceOutputStandard o) 
		{
			//计算流光宽度uv坐标越少，则获取白色流光图白色区域越大，就等于流光长度
			float2 uv = IN.uv_MainTex / _LightWidth;
			//流光图y轴偏移
			uv.y += _Time.y * _SpeedY;
			//流光图x轴偏移
			uv.x += _Time.y * _SpeedX;
			//获取流光图的蓝色通道，因为流光图都是黑白，获取红色绿色通道都可以
			fixed light = tex2D(_LightTex, uv).b;
			//获取要显示流光的位置，我这里使用蓝色通道来处理，我这边不用alpha来处理，因为透明图占内存
			fixed maskb = tex2D(_MaskTex, IN.uv_MainTex).b;
			//这里算出要流光的地方叠加颜色
			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color + light * _MoveLightColor * maskb;
			o.Albedo = c.rgb;
			// Metallic and smoothness come from slider variables
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Alpha = c.a;
		}
		ENDCG
	}
	FallBack "Diffuse"
}