Unity中一个节点实现植物动态（Shader）

1 . 核心思路就操作顶点作往复运动；

核心代码：

half  stage1 = dot(positionOS, float3(0, 1, 0)) * _Strength;
half  stage2 = sin(dot(positionOS, float3(1, 0, 0)) * _Strength + _Time.y * _Speed);
half  stage3 = stage1 * stage2 * float3(0.001, 0, 0.001);PositionVar  = stage3 + positionOS;

至于下面的贴图采样这些不重要，除非你需要特别指定顶点哪部分动，哪部分不需要动，你可以采样一个贴图和顶点作Mask操作；

以前在URP管线中也写过，一并发出来：

Shader "Common/Tree_Simple"
{Properties{   [MaterialEnum(Off,0,Front,1,Back,2)] _Cull("Cull", Int) = 2_BaseColor("Base Color",color) = (1,1,1,1)_MainTex("Base (RGB) Trans (A)", 2D) = "white" {}[Normal]_BumpMap("Normal Map", 2D) = "bump" {}_NormalScale("NormalPow", Range(0,2)) = 1.0_Metallic("Metallic", Range(0.0, 1.0)) = 0.0_Roughness("Roughness", Range(0.0, 1.0)) = 0.0[Header(Mask)][KeywordEnum(CLIP,ALPHA_TO_MASK)]ClipSwitch("Clip / AlphaToMask)",Float) = 0_Cutoff("Alpha Cutoff", Range(0,1)) = 0.333[Header(Y_Color)]       //对顶点进行X轴和Y轴上的偏移[KeywordEnum(YES,NO)]LEAF("是否树叶(渐变色开关)？",Float) = 1_Strength("摇摆幅度", Float) = 1_Speed("摇摆速度", Float) = 3_BaseColorMaskHeight("BaseColorMaskHeight",Range(0,1)) = 0.5 _BaseColorTop("BaseColorTop",Color) = (1,1,1,1)_BaseColorBottom("BaseColorBottom",Color) = (0,0,0,1)[Header(Shadow)]_ShadowMainColor("接受阴影颜色", color) = (0.25,0.25,0.25,1)[Toggle(_KALOS_G_FACTOR_ON)] _Kalos_G_Factor ("Optimize with Kalos G Factor", Int) = 1 }SubShader{Tags {"LightMode" = "UniversalForward" "RenderPipeline" = "UniversalPipeline" }LOD 100Cull [_Cull]AlphaToMask OnPass{Name "Unlit"HLSLPROGRAM// Required to compile gles 2.0 with standard srp library#pragma prefer_hlslcc gles#pragma exclude_renderers d3d11_9x#pragma vertex vert#pragma fragment frag#pragma multi_compile_fog#pragma shader_feature _ _KALOS_G_FACTOR_ON#pragma multi_compile CLIPSWITCH_CLIP CLIPSWITCH_ALPHA_TO_MASK#pragma multi_compile LEAF_YES LEAF_NO//光照贴图这一坨别丢了,不然移动端不显示#pragma multi_compile _ LIGHTMAP_SHADOW_MIXING#pragma multi_compile _ SHADOWS_SHADOWMASK#pragma multi_compile _ DIRLIGHTMAP_COMBINED#pragma multi_compile _ LIGHTMAP_ON#pragma multi_compile _ DYNAMICLIGHTMAP_ON	// URP 软阴影#pragma multi_compile_fragment _ _SHADOWS_SOFT// URP 主光阴影、联机阴影、屏幕空间阴影//#pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/UnityInstancing.hlsl"#include "PBRMath.hlsl"CBUFFER_START(UnityPerMaterial)half4  _BaseColor; half _NormalScale , _Metallic,_Roughness;float4 _MainTex_ST,_BumpMap_ST;float  _bakedGIBlend,_bakedGIPow,_Cutoff;half4  _ShadowMainColor;     half4 _BaseColorBottom,_BaseColorTop;half  _BaseColorMaskHeight , _Speed , _Strength;CBUFFER_ENDTEXTURE2D (_MainTex);SAMPLER(sampler_MainTex);TEXTURE2D (_BumpMap);SAMPLER(sampler_BumpMap);struct VertexInput{float4 positionOS       : POSITION;float2 uv               : TEXCOORD0;float4 normalOS         : NORMAL;float4 tangentOS        : TANGENT;float2 uvLM             : TEXCOORD1;        //光照贴图三件套float4 color            : COLOR0;};struct VertexOutput{float4 position       : SV_POSITION;float4 uv               : TEXCOORD0;float3 positionWS       :  TEXCOORD1;float3 normalWS         : TEXCOORD2;float3 tangentWS        : TEXCOORD3;float3 bitangentWS      : TEXCOORD4;float  fogCoord         : TEXCOORD5;float2 uvLM             : TEXCOORD6;        //光照贴图三件套float3 vertexSH         : TEXCOORD7;        //光照贴图三件套float4 color            : TEXCOORD8;};half3 Saturation(half3 finalCol, half Saturation){half   gray        = 0.2125 * finalCol.r + 0.7154 * finalCol.g + 0.0721 * finalCol.b;half3  grayColor   = half3(gray, gray, gray);return lerp(grayColor, finalCol, Saturation);}VertexOutput vert(VertexInput v){VertexOutput o = (VertexOutput)0;//--------------树叶飘动------------------------half  stage1 = dot(v.positionOS.xyz, float3(0, 1, 0)) * _Strength;half  stage2 = sin(dot(v.positionOS.xyz, float3(1, 0, 0)) * _Strength + _Time.y * _Speed);half3 stage3 = stage1 * stage2 * float3(0.001, 0, 0.001) * v.color.a; //------------------End---------------------------- VertexPositionInputs positionInputs = GetVertexPositionInputs(v.positionOS.xyz + stage3);o.position = positionInputs.positionCS;o.positionWS = positionInputs.positionWS; VertexNormalInputs normalInputs = GetVertexNormalInputs(v.normalOS.xyz,v.tangentOS);o.normalWS = normalInputs.normalWS;o.tangentWS = normalInputs.tangentWS;o.bitangentWS = normalInputs.bitangentWS;o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);o.uv.zw = TRANSFORM_TEX(v.uv, _BumpMap);OUTPUT_LIGHTMAP_UV(v.uvLM, unity_LightmapST, o.uvLM);         //光照贴图三件套  //o.position = TransformObjectToHClip(v.positionOS.xyz);o.fogCoord = ComputeFogFactor(o.position.z);return o;}half4 frag(VertexOutput i) : SV_Target{//阴影float4 SHADOW_COORDS = TransformWorldToShadowCoord(i.positionWS.xyz);Light  lightDirectional     = GetMainLight(SHADOW_COORDS);half   shadow        = lightDirectional.shadowAttenuation;//贴图采样float4 MainTex      = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv.xy);half4  normalTXS    = SAMPLE_TEXTURE2D(_BumpMap,sampler_BumpMap,i.uv.xy);float3 normalMap    = UnpackNormalScale(normalTXS,_NormalScale);real3x3 TBN         = real3x3(i.tangentWS, i.bitangentWS, i.normalWS);    //追求高精度half3 normalWS      = TransformTangentToWorld(normalMap,TBN);//向量准备half3 N = normalWS;half3 L = normalize(lightDirectional.direction);half3 V = SafeNormalize(_WorldSpaceCameraPos - i.positionWS);half3 H = normalize(L + V);//点积half  HdotL = max(dot(H, L), 1e-5);half  NdotV = max(dot(N, V), 1e-5);         half  HdotN = max(dot(H, N), 1e-5);half  NdotL = dot(N,L);half3 R     = reflect( -L , N );half  VdotR = dot ( V , R );NdotL = lerp(NdotL*0.5+0.5,max(dot(N, L), 1e-5),0.75);  //这个是我个人喜好！//PBR参数准备 half3 Albedo        = MainTex.rgb; half  occlusion     = MainTex.g;half  roughness     = normalTXS.a;half  smoothness    = (1 - roughness/_Roughness);      //计算待定half  metallic      = normalTXS.a * _Metallic;half3 F0            = Direct_F0_Function(Albedo, metallic);half3 Direct_F      = Direct_F_Function(HdotL, F0);//----// 直线光漫反射half3 KS = Direct_F;half3 KD = (1 - KS) * (1 - metallic);half3 DirectDiffColor = KD * Albedo * lightDirectional.color * NdotL;// 镜面反射half Direct_D = Direct_D_Function(HdotN, roughness);//----// BRDF#if defined(_KALOS_G_FACTOR_ON)half Direct_G = Direct_G_Function_Kalos(HdotL, roughness);#elsehalf Direct_G = Direct_G_Function(NdotL, NdotV, roughness);#endif#if defined(_KALOS_G_FACTOR_ON)half3 BRDFSpecSection = (Direct_D * Direct_G) * Direct_F / (4 * HdotL);#elsehalf3 BRDFSpecSection = (Direct_D * Direct_G) * Direct_F / (4 * NdotL * NdotV);#endifhalf3 DirectSpeColor = BRDFSpecSection * lightDirectional.color * (NdotL * PI * occlusion);// 第一部分（直线光照结果）:实时或者烘焙//-------光照贴图-------------//#ifdef LIGHTMAP_ONhalf3 bakedGI = SAMPLE_GI(i.uvLM, i.vertexSH, N);        //光照贴图三件套bakedGI = lerp(half3(1,1,1),pow( abs(bakedGI),_bakedGIPow),_bakedGIBlend);half3 DirectColor = bakedGI*Albedo;#elsehalf3 DirectColor = DirectDiffColor + DirectSpeColor;#endif// 第二部分：间接漫反射half3 shColor       = SH_IndirectionDiff(N) * occlusion;half3 Indirect_KS   = Indirect_F_Function(NdotV, F0, roughness);half3 Indirect_KD   = (1 - Indirect_KS) * (1 - metallic);half3 IndirectDiffColor = shColor * Indirect_KD * Albedo;// 间接反射//----// 反射探针的间接光half3 IndirectSpeCubeColor  = IndirectSpeCube(N, V, roughness, occlusion); half3 IndirectSpeCubeFactor = IndirectSpeFactor(roughness, smoothness, BRDFSpecSection, F0, NdotV); half3 IndirectSpeColor      = IndirectSpeCubeColor *IndirectSpeCubeFactor; //----//间接漫反射 + 间接反射//魔改金属表现half  k = 1;  //探针强度IndirectSpeColor = IndirectSpeColor * k; //-------//魔改金属表现IndirectSpeColor.rgb = Saturation(IndirectSpeColor, k*metallic);IndirectSpeColor.rgb = IndirectSpeColor.rgb + IndirectSpeColor.rgb*metallic*(k);half3 IndirectColor = IndirectDiffColor + IndirectSpeColor; //----////----------------直接光漫射 + 间接光漫射(间接光反射) ------------------------------------half3 Col       = DirectColor + IndirectColor;      //-------------------------------------------------------------------------------------//--树叶Y方向颜色渐变(球形法线特性)--//LEAF_YES LEAF_NO#ifdef LEAF_YESfloat3 albedoMask = i.normalWS.y;albedoMask = albedoMask/2+0.5;albedoMask*=_BaseColorMaskHeight;albedoMask= smoothstep(0,1,albedoMask);half3 albedoMaskCol = lerp(_BaseColorBottom.rgb,_BaseColorTop.rgb,albedoMask);Col *= albedoMaskCol;#elif LEAF_NO#endif       Col       = Col * _BaseColor.rgb;Col       = MixFog(Col.rgb, i.fogCoord);Col       = lerp(_ShadowMainColor.rgb * Col, Col, shadow); #ifdef CLIPSWITCH_CLIPhalf  Alpha     = 1;clip(MainTex.a-_Cutoff);#elif  CLIPSWITCH_ALPHA_TO_MASKhalf  Alpha     = MainTex.a;#endifhalf4 finalCol  = half4(Col,Alpha);return finalCol;}ENDHLSL}UsePass "Universal Render Pipeline/Lit/ShadowCaster"UsePass "Universal Render Pipeline/Lit/Meta"UsePass "Universal Render Pipeline/Lit/DepthOnly" }
}

静态图没这么丑..不知道咋压缩的..