unity urp管线扫光效果

urp管线下实现扫光效果

基本思路,还是根据深度还原世界坐标(以下简称world_pos),根据坐标的xyz判断是否在一些范围内,然后进行基于xyz两个坐标轴进行扫光

这里进行一个扩展,让扫光可以沿着任一方向进行,

就是传入一个旋转变换矩阵,对world_pos进行变换,然后判断aabb盒,这样就可以实现非xyz轴方向的扫光效果

运行效果如下:

可以沿任意方向扫光

代码如下:

shader:

Shader "lsc/screen_scan_shader"
{Properties{_MainTex("Texture", 2D) = "white" {}_scan_brush("Texture", 2D) = "white" {}}SubShader{// No culling or depthCull Off ZWrite Off ZTest AlwaysPass{HLSLPROGRAM#pragma vertex vert#pragma fragment frag#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"//sampler2D _CameraDepthTexture;float4x4 _mtx_view_inv;float4x4 _mtx_proj_inv;//float4x4 _mtx_clip_to_world;TEXTURE2D_X_FLOAT(_CameraDepthTexture);SAMPLER(sampler_CameraDepthTexture);//扫光参数float4 _scan_color;float4 _scan_box_min;float4 _scan_box_max;float4x4 _scan_box_world_mtx;TEXTURE2D_X_FLOAT(_scan_brush);SAMPLER(sampler_LinearClamp);struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;};struct v2f{float2 uv : TEXCOORD0;float4 vertex : SV_POSITION;float4 screen_space : TEXCOORD1;};float4 cal_world_pos_by_dep(float ndc_dep, float2 screen_space, out float4 view_pos){// 取出非线性深度与视深度float linearDepthZ = LinearEyeDepth(ndc_dep, _ZBufferParams);// 屏幕转ndcfloat4 ndc_pos;ndc_pos.xy = screen_space * 2.0 - 1.0;ndc_pos.zw = float2(ndc_dep, 1);// 添加齐次因子ndc_pos = ndc_pos * linearDepthZ;// 转成观察与世界坐标view_pos = mul(_mtx_proj_inv, ndc_pos);float4 world_pos = mul(_mtx_view_inv, float4(view_pos.xyz, 1));return world_pos;}int is_in_box(float3 pos){//todo : need optionif (pos.x <= _scan_box_max.x &&pos.y <= _scan_box_max.y &&pos.z <= _scan_box_max.z &&pos.x >= _scan_box_min.x &&pos.y >= _scan_box_min.y &&pos.z >= _scan_box_min.z)return 1;return 0;}v2f vert (appdata v){v2f o;o.vertex = TransformObjectToHClip(v.vertex);o.uv = v.uv;// 计算屏幕空间坐标(含齐次因子)o.screen_space = ComputeScreenPos(o.vertex);return o;}sampler2D _MainTex;float4 frag (v2f i) : SV_Target{float4 col = tex2D(_MainTex, i.uv);// 插值后的屏幕坐标去除齐次因子float2 screen_space = i.screen_space.xy / i.screen_space.w;// 取出非线性深度float org_depth = SAMPLE_TEXTURE2D_X(_CameraDepthTexture, sampler_CameraDepthTexture, screen_space).x;// 计算世界坐标float4 view_pos;float4 world_pos = cal_world_pos_by_dep(org_depth, screen_space, view_pos);//转换到包围盒的旋转平移空间float4 box_space_pos = mul(_scan_box_world_mtx, float4(world_pos.xyz, 1));int in_box = is_in_box(box_space_pos.xyz);float2 brush_uv = float2(abs(box_space_pos.x - _scan_box_min.x) / (_scan_box_max.x - _scan_box_min.x),abs(box_space_pos.z - _scan_box_min.z) / (_scan_box_max.z - _scan_box_min.z));// 从纹理中采样渐变效果,或者也可以用xz坐标计算生成简单的渐变效果float4 scan_brush = SAMPLE_TEXTURE2D_X(_scan_brush, sampler_LinearClamp, brush_uv).x;float scan_scale = scan_brush.r * brush_uv.x * brush_uv.y;col.xyz = _scan_color.xyz * in_box * scan_scale + col.xyz;//float tmp = world_pos.y;//col.xyz = float3(tmp, tmp, tmp);return col;}ENDHLSL}}
}

render feature pass c#代码

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class ScreenScanRenderPassFeature : ScriptableRendererFeature
{class CustomRenderPass : ScriptableRenderPass{public Material screen_scan_material = null;public RenderTargetIdentifier render_target_color;public RenderTargetHandle temp_render_target;// This method is called before executing the render pass.// It can be used to configure render targets and their clear state. Also to create temporary render target textures.// When empty this render pass will render to the active camera render target.// You should never call CommandBuffer.SetRenderTarget. Instead call <c>ConfigureTarget</c> and <c>ConfigureClear</c>.// The render pipeline will ensure target setup and clearing happens in a performant manner.public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData){}// Here you can implement the rendering logic.// Use <c>ScriptableRenderContext</c> to issue drawing commands or execute command buffers// https://docs.unity3d.com/ScriptReference/Rendering.ScriptableRenderContext.html// You don't have to call ScriptableRenderContext.submit, the render pipeline will call it at specific points in the pipeline.public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//Debug.Log("Execute fog pass");if (!screen_scan_material)return;{Camera cam = renderingData.cameraData.camera;var mtx_view_inv = cam.worldToCameraMatrix.inverse;var mtx_proj_inv = cam.projectionMatrix.inverse;screen_scan_material.SetMatrix("_mtx_view_inv", mtx_view_inv);screen_scan_material.SetMatrix("_mtx_proj_inv", mtx_proj_inv);}// scan box{Vector4 box_min = new Vector4(-15, -1000, -50, 0);Vector4 box_max = new Vector4(15, 1000, 50, 0);screen_scan_material.SetVector("_scan_box_min", box_min);screen_scan_material.SetVector("_scan_box_max", box_max);screen_scan_material.SetVector("_scan_color", new Vector4(179.0f/255.0f, 224.0f / 255.0f, 230.0f / 255.0f, 1.0f));Matrix4x4 box_mtx = Matrix4x4.identity;//box_mtx = Matrix4x4.Rotate(Quaternion.Euler(0, 45 + 30 * Time.time, 0)) * Matrix4x4.Translate(new Vector3(-400, 0, -380));box_mtx = Matrix4x4.Rotate(Quaternion.Euler(0, 45 - 30 * Time.time, 0)) * Matrix4x4.Translate(new Vector3(-400, 0, -380));screen_scan_material.SetMatrix("_scan_box_world_mtx", box_mtx);}const string CommandBufferTag = "screen scan Pass";var cmd = CommandBufferPool.Get(CommandBufferTag);RenderTextureDescriptor opaqueDesc = renderingData.cameraData.cameraTargetDescriptor;opaqueDesc.depthBufferBits = 0;cmd.GetTemporaryRT(temp_render_target.id, opaqueDesc);// 通过材质，将计算结果存入临时缓冲区cmd.Blit(render_target_color, temp_render_target.Identifier(), screen_scan_material);// 再从临时缓冲区存入主纹理cmd.Blit(temp_render_target.Identifier(), render_target_color);// 执行命令缓冲区context.ExecuteCommandBuffer(cmd);// 释放命令缓存CommandBufferPool.Release(cmd);// 释放临时RTcmd.ReleaseTemporaryRT(temp_render_target.id);}// Cleanup any allocated resources that were created during the execution of this render pass.public override void OnCameraCleanup(CommandBuffer cmd){}}CustomRenderPass m_ScriptablePass;public Material screen_scan_material = null;/// <inheritdoc/>public override void Create(){m_ScriptablePass = new CustomRenderPass();// Configures where the render pass should be injected.m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingOpaques;}// Here you can inject one or multiple render passes in the renderer.// This method is called when setting up the renderer once per-camera.public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){m_ScriptablePass.render_target_color = renderer.cameraColorTarget;m_ScriptablePass.screen_scan_material = screen_scan_material;renderer.EnqueuePass(m_ScriptablePass);}
}

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