[A] wind cloth

Assets/Test/Wind/Test_wave_anim_WaveAnimTest.mat

@@ -24,6 +24,10 @@ Material:
   m_SavedProperties:
     serializedVersion: 3
     m_TexEnvs:
+    - _Texture2D:
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+        m_Scale: {x: 1, y: 1}
+        m_Offset: {x: 0, y: 0}
     - unity_Lightmaps:
         m_Texture: {fileID: 0}
         m_Scale: {x: 1, y: 1}
@@ -40,10 +44,10 @@ Material:
     m_Floats:
     - _QueueControl: 0
     - _QueueOffset: 0
-    - _WindAmplitude: 0
+    - _WindAmplitude: 0.5
-    - _WindSpeed: 0
+    - _WindSpeed: 0.1
     m_Colors:
-    - _Wind: {r: 0, g: 0, b: 0, a: 0}
+    - _Wind: {r: 0, g: 0, b: 0, a: 1}
   m_BuildTextureStacks: []
 --- !u!114 &291855134940589853
 MonoBehaviour:

Assets/Test/Wind/WaveAnimTest.shadergraph

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@@ -1638,6 +1347,21 @@
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Assets/Test/Wind/WindAnim.hlsl

@@ -2,20 +2,16 @@
 #ifndef WIND_ANIM
 #define WIND_ANIM
 
-// SmoothTriangleWave function
+inline float4 SmoothCurve( float4 x ) {
-inline float SmoothTriangleWave(float x)
+    return x * x *( 3.0 - 2.0 * 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 TriangleWave( float4 x ) {
-inline float4 SmoothTriangleWave(float4 x)
+    return abs( frac( x + 0.5 ) * 2.0 - 1.0 );
-{
+}
-    return float4(SmoothTriangleWave(x.x), SmoothTriangleWave(x.y), SmoothTriangleWave(x.z), SmoothTriangleWave(x.w));
+
+inline float4 SmoothTriangleWave( float4 x ) {
+    return SmoothCurve( TriangleWave( x ) );
 }
 
 inline void WindVert_float(float4 pos, float3 normal, float3 vertColor, float4 wind, float speed, float amplitude, out float4 aniPos)
@@ -27,8 +23,8 @@ inline void WindVert_float(float4 pos, float3 normal, float3 vertColor, float4 w
 
 
     float bendingFact = 1 - vertColor.b;
-    //wind.xyz = TransformWorldToObject(wind.xyz);
+    wind.xyz = TransformWorldToObject(wind.xyz);
-    //wind.z = wind.z * bendingFact;
+    wind.z = wind.z * bendingFact;
 
     float4 animParams = float4(0, amplitude, bendingFact.xx);
     float time = _Time.y * float2(speed, 1);

Assets/Test/Wind/WindCloth.mat

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+    - _AlphaToMask: 0
+    - _Blend: 0
+    - _BlendModePreserveSpecular: 1
+    - _BumpScale: 1
+    - _ClearCoatMask: 0
+    - _ClearCoatSmoothness: 0
+    - _Cull: 2
+    - _Cutoff: 0.5
+    - _DetailAlbedoMapScale: 1
+    - _DetailNormalMapScale: 1
+    - _DstBlend: 0
+    - _DstBlendAlpha: 0
+    - _EnvironmentReflections: 1
+    - _GlossMapScale: 0
+    - _Glossiness: 0
+    - _GlossyReflections: 0
+    - _Metallic: 0
+    - _OcclusionStrength: 1
+    - _Parallax: 0.005
+    - _QueueOffset: 0
+    - _ReceiveShadows: 1
+    - _Smoothness: 0.5
+    - _SmoothnessTextureChannel: 0
+    - _SpecularHighlights: 1
+    - _SrcBlend: 1
+    - _SrcBlendAlpha: 1
+    - _Surface: 0
+    - _WindAmplitude: 1.3
+    - _WindSpeed: 0.14
+    - _WorkflowMode: 1
+    - _ZWrite: 1
+    m_Colors:
+    - _BaseColor: {r: 1, g: 1, b: 1, a: 1}
+    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _SpecColor: {r: 0.2, g: 0.2, b: 0.2, a: 1}
+    - _Wind: {r: 0, g: 0, b: 0, a: 1}
+  m_BuildTextureStacks: []

Assets/Test/Wind/WindCloth.mat.meta

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Packages/zzwater/shaders/libs/WindAnim.hlsl

@@ -0,0 +1,56 @@
+//UNITY_SHADER_NO_UPGRADE
+#ifndef WIND_ANIM_INCLUDE
+#define WIND_ANIM_INCLUDE
+
+inline float4 SmoothCurve( float4 x ) {
+    return x * x *( 3.0 - 2.0 * x );
+}
+
+inline float4 TriangleWave( float4 x ) {
+    return abs( frac( x + 0.5 ) * 2.0 - 1.0 );
+}
+
+inline float4 SmoothTriangleWave( float4 x ) {
+    return SmoothCurve( TriangleWave( x ) );
+}
+
+
+inline float4 ClothWindAnim(float4 pos, float3 normal, float4 animParams,float4 wind,float2 time)
+{	
+    // 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;
+}
+
+#endif //WIND_ANIM_INCLUDE 

Packages/zzwater/shaders/libs/WindAnim.hlsl.meta

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Packages/zzwater/shaders/wind_cloth.shader

@@ -0,0 +1,105 @@
+Shader "zzwind/WindClothUnlit"
+{
+    
+    Properties
+    {
+
+        [MainTexture] _BaseMap("Texture", 2D) = "white" {}
+        [MainColor] _BaseColor("Color", Color) = (1, 1, 1, 1)
+        _Cutoff("AlphaCutout", Range(0.0, 1.0)) = 0.5
+        _Wind("Wind params",Vector) = (1,1,1,1)
+        _WindAmplitude("Wind Amplitude", float) = 0.5
+        _WindSpeed("Wind Speed",float) = 0.5
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            "RenderType" = "Opaque"
+            "IgnoreProjector" = "True"
+            "UniversalMaterialType" = "Unlit"
+            "RenderPipeline" = "UniversalPipeline"
+        }
+
+        Pass
+        {
+            Name "Unlit"
+			Blend SrcAlpha OneMinusSrcAlpha, One OneMinusSrcAlpha
+            ZWrite On
+            Cull Back
+            ZTest LEqual
+            ZClip On
+
+            HLSLPROGRAM
+
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
+			#include "Packages/zzwater/shaders/libs/WindAnim.hlsl"
+
+
+            TEXTURE2D(_BaseMap);
+            SAMPLER(sampler_BaseMap);
+
+            CBUFFER_START(UnityPerMaterial)
+                float _Cutoff;
+                half4 _BaseColor;
+                half4 _BaseMap_ST;
+                half4 _Wind;
+                float _WindAmplitude;
+                float _WindSpeed;
+            CBUFFER_END
+
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                float4 tangentOS : TANGENT;
+                float2 uv : TEXCOORD0;
+                float3 normalOS : NORMAL;
+                float4 color : COLOR;
+            };
+
+            struct Varyings
+            {
+                float4 positionCS : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float4 color : TEXCOORD2;
+            };
+
+            Varyings vert(Attributes input)
+            {
+                Varyings output;
+
+                float bendingFact = input.color.a;
+                float4 wind;
+                wind.xyz = _Wind.xyz;
+                wind.w = _Wind.w * bendingFact.x;
+
+                float4 windParams = float4(0,_WindAmplitude,bendingFact,0);
+                float windTime = _Time.y * _WindSpeed;
+                float4 VertexInWndPos = ClothWindAnim(input.positionOS,input.normalOS,windParams,wind,windTime);
+
+                output.positionCS = TransformObjectToHClip(VertexInWndPos);
+                output.uv = TRANSFORM_TEX(input.uv, _BaseMap);
+                output.color = input.color;
+                return output;
+            }
+
+            float4 frag(Varyings input) : SV_Target
+            {
+                half2 uv = input.uv;
+                half4 texColor = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, uv);
+                half3 color = texColor.rgb * _BaseColor.rgb;
+                half alpha = texColor.a * _BaseColor.a;
+                clip(alpha - _Cutoff);
+
+                return float4(color, alpha);
+            }
+
+            ENDHLSL
+        }
+    }
+}

Packages/zzwater/shaders/wind_cloth.shader.meta

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