// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Demo_Flag/Flag" // 旗帜飘动{Properties{_MainTex ("Main Tex", 2D) = "white" {} //主纹理_FlagColor("Flag Color", Color) = (1, 1, 1, 1) //旗子颜色_Frequency("Frequency", float) = 1//波动频率_AmplitudeStrength("Amplitude Strength", float) = 1 // 振幅强度_InvWaveLength("Inverse Wave Length", float) = 1 //波长的倒数（_InvWaveLength越小，波长越大）_Fold("Fold", Range(0.0, 2.0)) = 0.5//旗帜褶皱程度}SubShader{// Need to disable batching because of the vertex animationTags {"DisableBatching" = "True" "RenderType"="Opaque"}Pass{Tags{"LightMode" = "ForwardBase"}Cull OffCGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"sampler2D _MainTex;float4 _MainTex_ST;float4 _FlagColor;float _Frequency;float _AmplitudeStrength;float _InvWaveLength;float _Fold;struct a2v{float4 vertex : POSITION;float4 texcoord : TEXCOORD0;};struct v2f{float4 pos : SV_POSITION;float2 uv : TEXCOORD0;}; v2f vert (a2v v){v2f o;o.uv = v.texcoord.xy;float4 offset;// 初始化顶点偏移量offset.xyzw = float4(0.0, 0.0, 0.0, 0.0);// 计算偏移之前的顶点位置float4 v_before = mul(unity_ObjectToWorld, v.vertex);// 对顶点的 Y 方向进行偏移（正弦型函数y=Asin(ωx+φ)+b）offset.y = _AmplitudeStrength * sin(_Frequency * _Time.y + (v_before.x + v_before.y* _Fold) * _InvWaveLength) * o.uv.x;//把偏移量添加到顶点位置上，再进行正常的顶点变换即可o.pos = UnityObjectToClipPos(v.vertex + offset);o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);return o;}fixed4 frag (v2f i) : SV_Target{fixed4 col = tex2D(_MainTex, i.uv);col.rgb *= _FlagColor.rgb;return col;}ENDCG}}FallBack "VertexLit"}
