1、打开Unity，新建一个空工程，导入中一张图片，具体如下图
2、在场景中，新建一个Image，适当合理布局，具体如下
3、在工程中新建Shader，命名为 FlowLightShader，双击打开进行编辑，具体如下图
4、FlowLightShader 脚本的具体内容如下：Shader"Custom/FlowLightShader"{霸烹钟爷Properties{ [HideInInspector] _MainTex("Base(RGB)",2D)="white"{} _FlashColor("FlashColor",Color)=(1,1,1,1) _Angle("FlashAngle",Range(0,180))=45 _Width("FlashWidth",Range(0,1))=0.2 _LoopTime("LoopTime",Float)=0.5 _Interval("TimeInterval",Float)=1.5 } SubShader { Tags{"Queue"="Transparent""RenderType"="Transparent"} LOD200 BlendSrcAlphaOneMinusSrcAlpha CGPROGRAM #pragmasurfacesurfLambertalphaexclude_path:prepassnoforwardaddsampler2D_MainTex; float4_FlashColor; float_Angle; float_Width; float_LoopTime; float_Interval;structInput { half2uv_MainTex; };floatinFlash(half2uv) { floatbrightness=0;floatangleInRad=0.0174444*_Angle; floattanInverseInRad=1.0/tan(angleInRad);floatcurrentTime=_Time.y; floattotalTime=_Interval+_LoopTime; floatcurrentTurnStartTime=(int)((currentTime/totalTime))*totalTime; floatcurrentTurnTimePassed=currentTime-currentTurnStartTime-_Interval;boolonLeft=(tanInverseInRad>0); floatxBottomFarLeft=onLeft?0.0:tanInverseInRad; floatxBottomFarRight=onLeft?(1.0+tanInverseInRad):1.0;floatpercent=currentTurnTimePassed/_LoopTime; floatxBottomRightBound=xBottomFarLeft+percent*(xBottomFarRight-xBottomFarLeft); floatxBottomLeftBound=xBottomRightBound-_Width;floatxProj=uv.x+uv.y*tanInverseInRad;if(xProj>xBottomLeftBound&&xProj<xBottomRightBound) { brightness=1.0-abs(2.0*xProj-(xBottomLeftBound+xBottomRightBound))/_Width; }returnbrightness; }voidsurf(InputIN,inoutSurfaceOutputo) { half4texCol=tex2D(_MainTex,IN.uv_MainTex); floatbrightness=inFlash(IN.uv_MainTex);o.Emission=texCol.rgb+_FlashColor.rgb*brightness;//改为输出Emission，不受光影响 o.Alpha=texCol.a; }ENDCG } FallBack"Diffuse"}
5、脚本编译正确，回到Unity，在工程中，新建一个 Material，然后 Shader 通道设置为 新建的 Shader，简单的设置参数，具体如下图
6、把材质赋给Image，然后把贴图设置为 sprite，也赋给 Image，具体如下图
7、运行场景，
