HDRP(SRP) 渲染一个摄像机剔除遮罩外的物体

设置一个被剔除的图层

编写一个 CustomPass

在 AggregateCullingParameters 中，额外包含了目标图层，以进行接下来的渲染。

在 Execute() 中，这个 Pass 主要做了以下事情：

对目标图层进行完整渲染。（cameraColorBuffer）
对目标图层写入Motion Vector。（cameraMotionVectorsBuffer）

using UnityEngine;
using UnityEngine.Rendering.HighDefinition;
using UnityEngine.Rendering;
using UnityEngine.Experimental.Rendering;
using System.Collections.Generic;
using System;/// <summary>
/// DrawRenderers Custom Pass
/// </summary>
[System.Serializable]
public class ViewingObjectPass : CustomPass
{/// <summary>/// HDRP Shader passes/// </summary>public enum ShaderPass{// Ordered by frame time in HDRP///<summary>Object Depth pre-pass, only the depth of the object will be rendered.</summary>DepthPrepass = 1,///<summary>Forward pass, render the object color.</summary>Forward = 0,}// Used only for the UI to keep track of the toggle state[SerializeField] internal bool filterFoldout;[SerializeField] internal bool rendererFoldout;//Filter settings/// <summary>/// Render Queue filter to select which kind of object to render./// </summary>public RenderQueueType renderQueueType = RenderQueueType.AllOpaque;/// <summary>/// Layer Mask filter, select which layer to render./// </summary>public LayerMask layerMask = 1; // Layer mask Default enabled/// <summary>/// Sorting flags of the objects to render./// </summary>public SortingCriteria sortingCriteria = SortingCriteria.CommonOpaque;/// <summary>/// When true, overrides the depth state of the objects./// </summary>public bool overrideDepthState = false;/// <summary>/// Overrides the Depth comparison function, only used when overrideDepthState is true./// </summary>public CompareFunction depthCompareFunction = CompareFunction.LessEqual;/// <summary>/// Overrides the Depth write, only used when overrideDepthState is true./// </summary>public bool depthWrite = true;/// <summary>/// Set the shader pass to use when the override material is null/// </summary>public ShaderPass shaderPass = ShaderPass.Forward;int fadeValueId;static ShaderTagId[] forwardShaderTags;static ShaderTagId[] depthShaderTags;// Cache the shaderTagIds so we don't allocate a new array each frameShaderTagId[] cachedShaderTagIDs;[SerializeField, HideInInspector]Shader motionVectorShader;Material motionVector;/// <summary>/// Called before the first execution of the pass occurs./// Allow you to allocate custom buffers./// </summary>/// <param name="renderContext">The render context</param>/// <param name="cmd">Current command buffer of the frame</param>protected override void Setup(ScriptableRenderContext renderContext, CommandBuffer cmd){fadeValueId = Shader.PropertyToID("_FadeValue");// In case there was a pass index assigned, we retrieve the name of this pass//if (String.IsNullOrEmpty(overrideMaterialPassName) && overrideMaterial != null)//    overrideMaterialPassName = overrideMaterial.GetPassName(overrideMaterialPassIndex);forwardShaderTags = new ShaderTagId[]{HDShaderPassNames.s_ForwardName,            // HD Lit shaderHDShaderPassNames.s_ForwardOnlyName,        // HD Unlit shaderHDShaderPassNames.s_SRPDefaultUnlitName,    // Cross SRP Unlit shaderHDShaderPassNames.s_EmptyName,              // Add an empty slot for the override material};depthShaderTags = new ShaderTagId[]{HDShaderPassNames.s_DepthForwardOnlyName,HDShaderPassNames.s_DepthOnlyName,HDShaderPassNames.s_EmptyName,              // Add an empty slot for the override material};motionVectorShader = Shader.Find("Hidden/HDRP/MotionVectors");motionVector = CoreUtils.CreateEngineMaterial(motionVectorShader);}/// <summary>/// Use this method if you want to draw objects that are not visible in the camera./// For example if you disable a layer in the camera and add it in the culling parameters, then the culling result will contains your layer./// </summary>/// <param name="cullingParameters">Aggregate the parameters in this property (use |= for masks fields, etc.)</param>/// <param name="hdCamera">The camera where the culling is being done</param>protected override void AggregateCullingParameters(ref ScriptableCullingParameters cullingParameters, HDCamera hdCamera){cullingParameters.cullingMask |= (uint)(int)layerMask;}ShaderTagId[] GetShaderTagIds(){if (shaderPass == ShaderPass.DepthPrepass)return depthShaderTags;elsereturn forwardShaderTags;}/// <summary>/// Execute the DrawRenderers with parameters setup from the editor/// </summary>/// <param name="ctx">The context of the custom pass. Contains command buffer, render context, buffer, etc.</param>protected override void Execute(CustomPassContext ctx){var shaderPasses = GetShaderTagIds();//if (overrideMaterial != null)//{//    shaderPasses[shaderPasses.Length - 1] = new ShaderTagId(overrideMaterialPassName);//    overrideMaterial.SetFloat(fadeValueId, fadeValue);//}if (shaderPasses.Length == 0){Debug.LogWarning("Attempt to call DrawRenderers with an empty shader passes. Skipping the call to avoid errors");return;}var mask = overrideDepthState ? RenderStateMask.Depth : 0;mask |= overrideDepthState && !depthWrite ? RenderStateMask.Stencil : 0;var stateBlock = new RenderStateBlock(mask){depthState = new DepthState(depthWrite, depthCompareFunction),// We disable the stencil when the depth is overwritten but we don't write to it, to prevent writing to the stencil.stencilState = new StencilState(false),};PerObjectData renderConfig = ctx.hdCamera.frameSettings.IsEnabled(FrameSettingsField.Shadowmask)? HDUtils.GetBakedLightingWithShadowMaskRenderConfig(): HDUtils.GetBakedLightingRenderConfig();var result = new UnityEngine.Rendering.RendererUtils.RendererListDesc(shaderPasses, ctx.cullingResults, ctx.hdCamera.camera){rendererConfiguration = renderConfig,renderQueueRange = GetRenderQueueRange(renderQueueType),sortingCriteria = sortingCriteria,excludeObjectMotionVectors = false,stateBlock = stateBlock,layerMask = layerMask,};var renderCtx = ctx.renderContext;CoreUtils.SetRenderTarget(ctx.cmd, ctx.cameraColorBuffer, ctx.cameraDepthBuffer, ClearFlag.None);CoreUtils.DrawRendererList(ctx.renderContext, ctx.cmd, renderCtx.CreateRendererList(result));result = new UnityEngine.Rendering.RendererUtils.RendererListDesc(HDShaderPassNames.s_MotionVectorsName, ctx.cullingResults, ctx.hdCamera.camera){rendererConfiguration = PerObjectData.MotionVectors,renderQueueRange = GetRenderQueueRange(renderQueueType),sortingCriteria = sortingCriteria,excludeObjectMotionVectors = false,stateBlock = stateBlock,layerMask = layerMask,};CoreUtils.SetRenderTarget(ctx.cmd, ctx.cameraMotionVectorsBuffer, ctx.cameraDepthBuffer, ClearFlag.None);CoreUtils.DrawRendererList(ctx.renderContext, ctx.cmd, renderCtx.CreateRendererList(result));}protected override void Cleanup(){CoreUtils.Destroy(motionVector);}
}

把 Pass 挂起来，如图进行配置

效果

理论上不出bug的话跟正常渲染没啥区别（

可能会有奇怪的地方出BUG，比如SSAO（这个我直接禁用了），比如运动模糊和TAA（已经修复，即代码中的写入Motion Vector），欢迎留言讨论。
抛砖引玉，恳请批评指正！

参考文献：

Unity SRP 中渲染 Motion Vector 的正确姿势 - SardineFish - https://www.sardinefish.com/blog/458

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