[A] wind Test shader

Assets/Test/Custom_LeafWindShaderWithDisplacement.mat

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Assets/Test/Wind-Cloth(Vertex Weight).shader

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+// Upgrade NOTE: commented out 'float4 unity_LightmapST', a built-in variable
+// Upgrade NOTE: commented out 'sampler2D unity_Lightmap', a built-in variable
+// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'
+// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'
+// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+// Upgrade NOTE: replaced tex2D unity_Lightmap with UNITY_SAMPLE_TEX2D
+
+Shader "Wind/TreeLeaf-Cloth-CutOut(Vertex Weight)" {
+Properties {
+	_MainTex ("Base (RGB) Gloss (A)", 2D) = "gray" {}
+	_Color ("Main Color", Color) = (1,1,1,1)
+	_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
+	_Wind("Wind params",Vector) = (1,1,1,1)
+	_WindAmplitude("Wind Amplitude", float) = 0.5
+	_WindSpeed("Wind Speed",float) = 0.5
+}
+
+SubShader {
+	Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout" "LightMode"="ForwardBase"}
+	LOD 400
+	
+	CGINCLUDE
+	#include "UnityCG.cginc"
+	#include "TerrainEngine.cginc"
+
+	sampler2D _MainTex;
+	float4 _MainTex_ST;
+	#ifndef LIGHTMAP_OFF
+	// float4 unity_LightmapST;
+	// sampler2D unity_Lightmap;
+	#endif
+	
+	float  _Cutoff = 0.5;
+	float4 _Color;
+	float _WindAmplitude;
+	float _WindSpeed;
+
+	struct v2f {
+		float4 pos : SV_POSITION;
+		float2 uv : TEXCOORD0;
+		float3 color : COLOR;
+		#ifndef LIGHTMAP_OFF
+		float2 lmap : TEXCOORD1;
+		#endif
+	};
+
+	inline float4 AnimateVertex2(float4 pos, float3 normal, float4 animParams,float4 wind,float2 time)
+	{	
+		// animParams stored in color
+		// animParams.x = branch phase
+		// animParams.y = edge flutter factor
+		// animParams.z = primary factor
+		// animParams.w = secondary factor
+
+		float fDetailAmp = 0.1f;
+		float fBranchAmp = 0.3f;
+	
+		// Phases (object, vertex, branch)
+		float fObjPhase = dot(unity_ObjectToWorld[3].xyz, 1);
+		float fBranchPhase = fObjPhase + animParams.x;
+	
+		float fVtxPhase = dot(pos.xyz, animParams.y + fBranchPhase);
+	
+		// x is used for edges; y is used for branches
+		float2 vWavesIn = time  + float2(fVtxPhase, fBranchPhase );
+	
+		// 1.975, 0.793, 0.375, 0.193 are good frequencies
+		float4 vWaves = (frac( vWavesIn.xxyy * float4(1.975, 0.793, 0.375, 0.193) ) * 2.0 - 1.0);
+	
+		vWaves = SmoothTriangleWave( vWaves );
+		float2 vWavesSum = vWaves.xz + vWaves.yw;
+
+		// Edge (xz) and branch bending (y)
+		float3 bend = animParams.y * fDetailAmp * normal.xyz;
+		bend.y = animParams.w * fBranchAmp;
+		pos.xyz += ((vWavesSum.xyx * bend)*wind.w + (wind.xyz * vWavesSum.y * animParams.w)) * wind.w; 
+
+		// Primary bending
+		// Displace position
+		pos.xyz += animParams.z * wind.xyz;
+	
+		return pos;
+	}
+	
+	v2f vert (appdata_full v)
+	{
+		v2f o;
+				
+		float	bendingFact	= 1-v.color.b;
+		
+		float4	wind;
+		wind.xyz	= mul((float3x3)unity_WorldToObject,_Wind.xyz);
+		wind.w		= _Wind.w  * bendingFact;
+				
+		float4	windParams		= float4(0,_WindAmplitude,bendingFact.xx);
+		float 	windTime 		= _Time.y * float2(_WindSpeed,1);
+		float4	VertexInWndPos	= AnimateVertex2(v.vertex,v.normal,windParams,wind,windTime);
+		
+		o.pos = UnityObjectToClipPos(VertexInWndPos);
+		o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+		
+		
+		#ifndef LIGHTMAP_OFF
+		o.lmap = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
+		#endif
+		
+		return o;
+	}
+	ENDCG
+
+
+	Pass {
+		CGPROGRAM
+		#pragma debug
+		#pragma vertex vert
+		#pragma fragment frag
+		#pragma fragmentoption ARB_precision_hint_fastest		
+		fixed4 frag (v2f i) : COLOR
+		{
+			fixed4 c = tex2D (_MainTex, i.uv);
+			
+			#ifndef LIGHTMAP_OFF
+			fixed3 lm = DecodeLightmap (UNITY_SAMPLE_TEX2D(unity_Lightmap, i.lmap));
+			c.rgb *= lm;
+			#endif
+			
+			c *= _Color; 
+			clip(c.a-_Cutoff);
+			return c;
+		}
+		ENDCG 
+	}	
+}
+}
+
+

Assets/Test/Wind-Cloth(Vertex Weight).shader.meta

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Assets/Test/test/Test_wave_anim_WaveAnimTest.mat

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Assets/Test/test/WindAnim.hlsl

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+//UNITY_SHADER_NO_UPGRADE
+#ifndef WIND_ANIM
+#define WIND_ANIM
+
+// SmoothTriangleWave function
+inline float SmoothTriangleWave(float x)
+{
+    // 将输入值限制在 [0, 1] 范围内，使用 frac 函数保证值是周期性的
+    x = frac(x);
+
+    // 使用三角函数生成平滑的波形，注意：frac(x) 生成的是 [0, 1] 之间的值
+    return 1.0 - abs(2.0 * x - 1.0);  // 生成平滑的三角波
+}
+
+// SmoothTriangleWave function for a 4-component vector
+inline float4 SmoothTriangleWave(float4 x)
+{
+    return float4(SmoothTriangleWave(x.x), SmoothTriangleWave(x.y), SmoothTriangleWave(x.z), SmoothTriangleWave(x.w));
+}
+
+inline void WindVert_float(float4 pos, float3 normal, float3 vertColor, float4 wind, float speed, float amplitude, out float4 aniPos)
+{	
+    // animParams.x = branch phase
+    // animParams.y = edge flutter factor
+    // animParams.z = primary factor
+    // animParams.w = secondary factor
+
+
+    float bendingFact = 1 - vertColor.b;
+    //wind.xyz = TransformWorldToObject(wind.xyz);
+    //wind.z = wind.z * bendingFact;
+
+    float4 animParams = float4(0, amplitude, bendingFact.xx);
+    float time = _Time.y * float2(speed, 1);
+
+
+    float fDetailAmp = 0.1f;
+    float fBranchAmp = 0.3f;
+
+    // Phases (object, vertex, branch)
+    float fObjPhase = dot(unity_ObjectToWorld[3].xyz, 1);
+    float fBranchPhase = fObjPhase + animParams.x;
+
+    float fVtxPhase = dot(pos.xyz, animParams.y + fBranchPhase);
+
+    // x is used for edges; y is used for branches
+    float2 vWavesIn = time  + float2(fVtxPhase, fBranchPhase );
+
+    // 1.975, 0.793, 0.375, 0.193 are good frequencies
+    float4 vWaves = (frac( vWavesIn.xxyy * float4(1.975, 0.793, 0.375, 0.193) ) * 2.0 - 1.0);
+
+    vWaves = SmoothTriangleWave( vWaves );
+    float2 vWavesSum = vWaves.xz + vWaves.yw;
+
+    // Edge (xz) and branch bending (y)
+    float3 bend = animParams.y * fDetailAmp * normal.xyz;
+    bend.y = animParams.w * fBranchAmp;
+    pos.xyz += ((vWavesSum.xyx * bend)*wind.w + (wind.xyz * vWavesSum.y * animParams.w)) * wind.w; 
+
+    // Primary bending
+    // Displace position
+    pos.xyz += animParams.z * wind.xyz;
+
+    aniPos = pos;
+	
+}
+
+
+#endif

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