Unity Urp无线延申的网格效果

无线延申的网格
该项目必须是再Urp项目
在这里插入图片描述

shader代码实现

Shader "Unlit/infTutorial1"
{Properties{_Alpha ("Alpha", Range(0, 0.5)) = 0.5}SubShader{Tags{"RenderPipeline"="UniversalRenderPipeline""RenderType"="Transparent""IgnoreProjector"="True""Queue"="Geometry"}Pass{Blend SrcAlpha OneMinusSrcAlphaZTest LEqualZWrite OffCull off HLSLPROGRAM#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"#pragma vertex vert#pragma fragment fragfloat _Alpha;float computeViewZ(float3 pos) {float4 clip_space_pos = mul(UNITY_MATRIX_VP, float4(pos.xyz, 1.0));float viewZ = clip_space_pos.w; //根据projection矩阵定义，positionCS.w = viewZreturn viewZ;};struct Attributes{float4 positionOS : POSITION;float2 uv : TEXCOORD0;};struct Varings{float4 positionCS : SV_POSITION;float3 nearPoint : TEXCOORD0;float3 farPoint : TEXCOORD1;};float3 TransformHClipToWorld(float3 positionCS, float4x4 inv_VP) {float4 unprojectedPoint =  mul(inv_VP, float4(positionCS, 1.0));return unprojectedPoint.xyz / unprojectedPoint.w;};half Grid(float2 uv){float2 derivative = fwidth(uv);uv = frac(uv - 0.5); //中心对齐uv = abs(uv - 0.5);uv = uv / derivative;float min_value = min(uv.x, uv.y);half grid = 1.0 - min(min_value, 1.0);return grid;};Varings vert(Attributes input){//此shader专用于quad mesh//所以使用4个顶点的uv值进行变换 作为 裁切空间的坐标//保证这是一个覆盖全屏幕的渲染Varings o;float2 uv = input.uv * 2.0 - 1.0;//默认情况下，Zndc = 1是远平面half farPlane = 1;half nearPlane = 0;#if defined(UNITY_REVERSED_Z)//有时候会反转zfarPlane = 1 - farPlane;nearPlane = 1 - nearPlane;#endiffloat4 position = float4(uv, farPlane, 1);float3 nearPoint = TransformHClipToWorld(float3(position.xy, nearPlane), UNITY_MATRIX_I_VP); float3 farPoint = TransformHClipToWorld(float3(position.xy, farPlane), UNITY_MATRIX_I_VP); o.positionCS = position;o.nearPoint = nearPoint;o.farPoint = farPoint;return o;};half4 frag(Varings input) : SV_TARGET{//计算地平面float t = -input.nearPoint.y / (input.farPoint.y - input.nearPoint.y);float3 positionWS = input.nearPoint + t * (input.farPoint - input.nearPoint);half ground = step(0, t);float3 cameraPos = _WorldSpaceCameraPos;float fromOrigin = abs(cameraPos.y);float viewZ = computeViewZ(positionWS);float2 uv = positionWS.xz;//计算gridfloat fading = max(0.0, 1.0 - viewZ / 150);half smallGrid = Grid(uv) * lerp(1, 0, min(1.0, fromOrigin / 100)); half middleGrid  = Grid(uv * 0.1) * lerp(1, 0, min(1.0, fromOrigin / 300)); half largeGrid = Grid(uv * 0.01) * lerp(1, 0, min(1.0, fromOrigin / 3000)); //合并计算half grid = smallGrid + middleGrid + largeGrid;return half4(0.5, 0.5, 0.5, ground * grid * fading * _Alpha);};ENDHLSL}}
}