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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 = 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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 diff --git a/Assets/Test/test/WindAnim.hlsl.meta 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