Wind.png

使用方法

1.创建一个Material材质球命名Grass,shader选择Grass.shader

2.选中Grass材质球shader属性中Wind风 Wind.png 拖入

2.在场景中创建一个Plane平面作为生成草的面,材质选择Grass材质

运行游戏就可以看到草了

Grass.shader

Shader "Roystan/Grass"
{Properties{[Header(Shading)]_TopColor("Top Color", Color) = (1,1,1,1)_BottomColor("Bottom Color", Color) = (1,1,1,1)_TranslucentGain("Translucent Gain", Range(0,1)) = 0.5[Space]_TessellationUniform ("Tessellation Uniform", Range(1, 64)) = 1[Header(Blades)]_BladeWidth("Blade Width", Float) = 0.05_BladeWidthRandom("Blade Width Random", Float) = 0.02_BladeHeight("Blade Height", Float) = 0.5_BladeHeightRandom("Blade Height Random", Float) = 0.3_BladeForward("Blade Forward Amount", Float) = 0.38_BladeCurve("Blade Curvature Amount", Range(1, 4)) = 2_BendRotationRandom("Bend Rotation Random", Range(0, 1)) = 0.2[Header(Wind)]_WindDistortionMap("Wind Distortion Map", 2D) = "white" {}_WindStrength("Wind Strength", Float) = 1_WindFrequency("Wind Frequency", Vector) = (0.05, 0.05, 0, 0)}CGINCLUDE#include "UnityCG.cginc"#include "Autolight.cginc"#include "Shaders/CustomTessellation.cginc"struct geometryOutput{float4 pos : SV_POSITION;#if UNITY_PASS_FORWARDBASE        float3 normal : NORMAL;float2 uv : TEXCOORD0;// unityShadowCoord4 is defined as a float4 in UnityShadowLibrary.cginc.unityShadowCoord4 _ShadowCoord : TEXCOORD1;#endif};// Simple noise function, sourced from http://answers.unity.com/answers/624136/view.html// Extended discussion on this function can be found at the following link:// https://forum.unity.com/threads/am-i-over-complicating-this-random-function.454887/#post-2949326// Returns a number in the 0...1 range.float rand(float3 co){return frac(sin(dot(co.xyz, float3(12.9898, 78.233, 53.539))) * 43758.5453);}// Construct a rotation matrix that rotates around the provided axis, sourced from:// https://gist.github.com/keijiro/ee439d5e7388f3aafc5296005c8c3f33float3x3 AngleAxis3x3(float angle, float3 axis){float c, s;sincos(angle, s, c);float t = 1 - c;float x = axis.x;float y = axis.y;float z = axis.z;return float3x3(t * x * x + c, t * x * y - s * z, t * x * z + s * y,t * x * y + s * z, t * y * y + c, t * y * z - s * x,t * x * z - s * y, t * y * z + s * x, t * z * z + c);}geometryOutput VertexOutput(float3 pos, float3 normal, float2 uv){geometryOutput o;o.pos = UnityObjectToClipPos(pos);#if UNITY_PASS_FORWARDBASEo.normal = UnityObjectToWorldNormal(normal);o.uv = uv;// Shadows are sampled from a screen-space shadow map texture.o._ShadowCoord = ComputeScreenPos(o.pos);#elif UNITY_PASS_SHADOWCASTER// Applying the bias prevents artifacts from appearing on the surface.o.pos = UnityApplyLinearShadowBias(o.pos);#endifreturn o;}geometryOutput GenerateGrassVertex(float3 vertexPosition, float width, float height, float forward, float2 uv, float3x3 transformMatrix){float3 tangentPoint = float3(width, forward, height);float3 tangentNormal = normalize(float3(0, -1, forward));float3 localPosition = vertexPosition + mul(transformMatrix, tangentPoint);float3 localNormal = mul(transformMatrix, tangentNormal);return VertexOutput(localPosition, localNormal, uv);}float _BladeHeight;float _BladeHeightRandom;float _BladeWidthRandom;float _BladeWidth;float _BladeForward;float _BladeCurve;float _BendRotationRandom;sampler2D _WindDistortionMap;float4 _WindDistortionMap_ST;float _WindStrength;float2 _WindFrequency;#define BLADE_SEGMENTS 3// Geometry program that takes in a single triangle and outputs a blade// of grass at that triangle first vertex position, aligned to the vertex's normal.[maxvertexcount(BLADE_SEGMENTS * 2 + 1)]void geo(triangle vertexOutput IN[3], inout TriangleStream<geometryOutput> triStream){float3 pos = IN[0].vertex.xyz;// Each blade of grass is constructed in tangent space with respect// to the emitting vertex's normal and tangent vectors, where the width// lies along the X axis and the height along Z.// Construct random rotations to point the blade in a direction.float3x3 facingRotationMatrix = AngleAxis3x3(rand(pos) * UNITY_TWO_PI, float3(0, 0, 1));// Matrix to bend the blade in the direction it's facing.float3x3 bendRotationMatrix = AngleAxis3x3(rand(pos.zzx) * _BendRotationRandom * UNITY_PI * 0.5, float3(-1, 0, 0));// Sample the wind distortion map, and construct a normalized vector of its direction.float2 uv = pos.xz * _WindDistortionMap_ST.xy + _WindDistortionMap_ST.zw + _WindFrequency * _Time.y;float2 windSample = (tex2Dlod(_WindDistortionMap, float4(uv, 0, 0)).xy * 2 - 1) * _WindStrength;float3 wind = normalize(float3(windSample.x, windSample.y, 0));float3x3 windRotation = AngleAxis3x3(UNITY_PI * windSample, wind);// Construct a matrix to transform our blade from tangent space// to local space; this is the same process used when sampling normal maps.float3 vNormal = IN[0].normal;float4 vTangent = IN[0].tangent;float3 vBinormal = cross(vNormal, vTangent) * vTangent.w;float3x3 tangentToLocal = float3x3(vTangent.x, vBinormal.x, vNormal.x,vTangent.y, vBinormal.y, vNormal.y,vTangent.z, vBinormal.z, vNormal.z);// Construct full tangent to local matrix, including our rotations.// Construct a second matrix with only the facing rotation; this will be used // for the root of the blade, to ensure it always faces the correct direction.float3x3 transformationMatrix = mul(mul(mul(tangentToLocal, windRotation), facingRotationMatrix), bendRotationMatrix);float3x3 transformationMatrixFacing = mul(tangentToLocal, facingRotationMatrix);float height = (rand(pos.zyx) * 2 - 1) * _BladeHeightRandom + _BladeHeight;float width = (rand(pos.xzy) * 2 - 1) * _BladeWidthRandom + _BladeWidth;float forward = rand(pos.yyz) * _BladeForward;for (int i = 0; i < BLADE_SEGMENTS; i++){float t = i / (float)BLADE_SEGMENTS;float segmentHeight = height * t;float segmentWidth = width * (1 - t);float segmentForward = pow(t, _BladeCurve) * forward;// Select the facing-only transformation matrix for the root of the blade.float3x3 transformMatrix = i == 0 ? transformationMatrixFacing : transformationMatrix;triStream.Append(GenerateGrassVertex(pos, segmentWidth, segmentHeight, segmentForward, float2(0, t), transformMatrix));triStream.Append(GenerateGrassVertex(pos, -segmentWidth, segmentHeight, segmentForward, float2(1, t), transformMatrix));}// Add the final vertex as the tip.triStream.Append(GenerateGrassVertex(pos, 0, height, forward, float2(0.5, 1), transformationMatrix));}ENDCGSubShader{Cull OffPass{Tags{"RenderType" = "Opaque""LightMode" = "ForwardBase"}CGPROGRAM#pragma vertex vert#pragma geometry geo#pragma fragment frag#pragma hull hull#pragma domain domain#pragma target 4.6#pragma multi_compile_fwdbase#include "Lighting.cginc"float4 _TopColor;float4 _BottomColor;float _TranslucentGain;float4 frag (geometryOutput i,  fixed facing : VFACE) : SV_Target{           float3 normal = facing > 0 ? i.normal : -i.normal;float shadow = SHADOW_ATTENUATION(i);float NdotL = saturate(saturate(dot(normal, _WorldSpaceLightPos0)) + _TranslucentGain) * shadow;float3 ambient = ShadeSH9(float4(normal, 1));float4 lightIntensity = NdotL * _LightColor0 + float4(ambient, 1);float4 col = lerp(_BottomColor, _TopColor * lightIntensity, i.uv.y);return col;}ENDCG}Pass{Tags{"LightMode" = "ShadowCaster"}CGPROGRAM#pragma vertex vert#pragma geometry geo#pragma fragment frag#pragma hull hull#pragma domain domain#pragma target 4.6#pragma multi_compile_shadowcasterfloat4 frag(geometryOutput i) : SV_Target{SHADOW_CASTER_FRAGMENT(i)}ENDCG}}
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U3d 种草 shader实现

Wind.png

使用方法

Grass.shader

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