网站后台html页面,推广链接制作软件,企业展厅公司哪家好,软件开发培训学校三八妇女节【Unity】RenderFeature笔记 RenderFeature是在urp中添加的额外渲染pass#xff0c;并可以将这个pass插入到渲染列队中的任意位置。内置渲染管线中Graphics 的功能需要在RenderFeature里实现,常见的如DrawMesh和Blit 可以实现的效果包括但不限于 后处理#xff0c;可以编写…【Unity】RenderFeature笔记 RenderFeature是在urp中添加的额外渲染pass并可以将这个pass插入到渲染列队中的任意位置。内置渲染管线中Graphics 的功能需要在RenderFeature里实现,常见的如DrawMesh和Blit 可以实现的效果包括但不限于 后处理可以编写shader对整个渲染画面进行修改。比如一些全局特效包括场景描边地形扫描 创建网格通过DrawMesh绘制定义的网格 渲染画面将场景渲染到纹理 …
一、RanderFeature简介
1. 创建RanderFeature
在project中Create→Rendering→URPRenderFeature
2.RanderFeature结构
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CustomRenderPassFeatureTest : ScriptableRendererFeature
{class CustomRenderPass : ScriptableRenderPass{// 在执行渲染通道之前调用// 创建临时渲染目标纹理。//为Execute提前准备需要的RenderTexture或者其它变量public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData){}//核心方法实现这个renderPass的逻辑public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){}//释放在OnCameraSetup里声明的变量如TemporaryRenderTexturepublic override void OnCameraCleanup(CommandBuffer cmd) {}}CustomRenderPass m_ScriptablePass;/// inheritdoc/public override void Create(){m_ScriptablePass new CustomRenderPass();//定义渲染的位置m_ScriptablePass.renderPassEvent RenderPassEvent.AfterRenderingOpaques;}// 这里你可以在渲染器中注入一个或多个渲染通道。//每一帧都执行public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){//把实例化的CustomRenderPass插入渲染管线renderer.EnqueuePass(m_ScriptablePass);}
}3.RenderFeatrue使用
在Universal Render Pipeline Asset_Renderer直接Add RenderFeatrue
二、后处理效果
关键词
1、CommandBuffer.Blit
Blit是很常用的后期效果方法在Build_in中常常是在OnRenderImage里被调用与urp不同的是在build_in里是通过Graphics.Blit调用。
Graphics.Blit
常用的接口 Blit(RenderTexturesource, RenderTexture dest, Material mat);
即使用着色器将源纹理复制到目标渲染纹理。
CommandBuffer.Blit
常用的接口public void Blit (Rendering.RenderTargetIdentifier source, Rendering.RenderTargetIdentifier dest, Material mat);
这与 Graphics.Blit相似 - 主要用于从一个渲染纹理复制到其他纹理可能使用自定义着色器
源纹理或渲染目标将作为“_MainTex”属性传递给材质。
在shader中_MainTex对应的是source最后retrun对应的是dest
2、RenderTargetIdentifier
渲染目标标识符标识 CommandBuffer的 RenderTexture
使用 CommandBuffer.GetTemporaryRT 创建的具有名称的临时渲染纹理
ScriptableRenderPass中有colorAttachment和depthAttachment是可以直接使用
RenderTargetHandle.CameraTarget.Identifier()可以得到当前的渲染标识符
renderingData.cameraData.renderer.cameraColorTarget 也可以得到当前的渲染标识符
简单实现
实现脚本
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CustomRenderPassFeatureTest : ScriptableRendererFeature
{//结构说明class CustomRenderPass : ScriptableRenderPass{// 在执行渲染通道之前调用// 创建临时渲染目标纹理。//为Execute提前准备需要的RenderTexture或者其它变量public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData) {}//核心方法实现这个renderPass的逻辑public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){}//释放在OnCameraSetup里声明的变量如TemporaryRenderTexturepublic override void OnCameraCleanup(CommandBuffer cmd){}}//后处理效果class CustomRenderShaderPostPass : ScriptableRenderPass{ //定义渲染材质通过Create方法赋值public Material _Material;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//创建一个CommandBufferCommandBuffer cmd CommandBufferPool.Get(ShowShader);//这里有一个疑问渲染标识符不管怎么传都不影响结果cmd.Blit(colorAttachment, RenderTargetHandle.CameraTarget.Identifier(), _Material);//执行CommandBuffercontext.ExecuteCommandBuffer(cmd);//回收CommandBufferCommandBufferPool.Release(cmd);}}CustomRenderShaderPostPass m_ScriptablePassPost;public Shader shader;/// inheritdoc/public override void Create(){m_ScriptablePassPost new CustomRenderShaderPostPass();//通过创建一个渲染材质m_ScriptablePassPost._Material new Material(shader);//定义渲染的位置m_ScriptablePassPost.renderPassEvent RenderPassEvent.AfterRenderingOpaques;}// 这里你可以在渲染器中注入一个或多个渲染通道。//每一帧都执行public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){//把实例化的CustomRenderPass插入渲染管线renderer.EnqueuePass(m_ScriptablePassPost);}
}1.实现饱和度和对比度调整
用shaderGraph实现 用shader实现
Shader Unlit/SaturationContrastShader
{SubShader{Pass{ZTest Always ZWrite OffCGPROGRAM#pragma vertex vert_img // 使用内置的vert_img顶点着色器#pragma fragment frag#include UnityCG.cgincsampler2D _CameraColorTexture; //饱和度fixed3 Saturation_float(float3 In, float Saturation){float luma dot(In, float3(0.2126729, 0.7151522, 0.0721750));return luma.xxx Saturation.xxx * (In - luma.xxx);}//对比度fixed3 Contrast_float(float3 In, float Contrast){float midpoint pow(0.5, 2.2);return (In - midpoint) * Contrast midpoint;}fixed4 frag (v2f_img i) : SV_Target{fixed4 col tex2D(_CameraColorTexture, i.uv);fixed3 Saturation Saturation_float(col, 5);fixed3 Contrast Saturation_float(Saturation, 5);return fixed4(Contrast.x, Contrast.y, Contrast.z,0.1);}ENDCG}}FallBack Off
}使用前 使用后
三、创建网格
关键词
1、CommandBuffer.DrawMesh
常用的接口DrawMesh(Mesh mesh, Matrix4x4 matrix, Material material);
这个接口相对简单传入mesh变换矩阵和材质
简单实现
这里接着上一个CustomRenderPassFeatureTest写同时实现后处理和网格创建 using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CustomRenderPassFeatureTest : ScriptableRendererFeature
{//结构说明class CustomRenderPass : ScriptableRenderPass{// 在执行渲染通道之前调用// 创建临时渲染目标纹理。//为Execute提前准备需要的RenderTexture或者其它变量public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData) {}//核心方法实现这个renderPass的逻辑public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){}//释放在OnCameraSetup里声明的变量如TemporaryRenderTexturepublic override void OnCameraCleanup(CommandBuffer cmd){}}//后处理效果class CustomRenderShaderPostPass : ScriptableRenderPass{ //定义渲染材质通过Create方法赋值public Material _Material;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//创建一个CommandBufferCommandBuffer cmd CommandBufferPool.Get(ShowShader);//这里有一个疑问渲染标识符不管怎么传都不影响结果cmd.Blit(colorAttachment, RenderTargetHandle.CameraTarget.Identifier(), _Material);//执行CommandBuffercontext.ExecuteCommandBuffer(cmd);//回收CommandBufferCommandBufferPool.Release(cmd);}}//绘制网格class CustomRenderPassCreateMesh : ScriptableRenderPass{public Material _Material;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){CommandBuffer cmd CommandBufferPool.Get(CreateMesh);cmd.DrawMesh(CreateMesh(), Matrix4x4.identity, _Material);//这里和后处理一样的操作context.ExecuteCommandBuffer(cmd);CommandBufferPool.Release(cmd);}//创建网格Mesh CreateMesh(){Mesh mesh new Mesh();mesh.vertices new Vector3[4] { new Vector3(1, 1, 1), new Vector3(-1, 1, 1), new Vector3(-1, 1, -1), new Vector3(1, 1, -1) };int[] indices new int[8] { 0, 1, 1, 2, 2, 3, 3, 0 };//创建简单的线网格mesh.SetIndices(indices, MeshTopology.Lines, 0);return mesh;}}CustomRenderShaderPostPass m_ScriptablePassPost;CustomRenderPassCreateMesh m_ScriptablePassCreateMesh;public Shader shaderPost;public Shader shaderMesh;/// inheritdoc/public override void Create(){m_ScriptablePassPost new CustomRenderShaderPostPass();//通过创建一个渲染材质m_ScriptablePassPost._Material new Material(shaderPost);//定义渲染的位置m_ScriptablePassPost.renderPassEvent RenderPassEvent.AfterRendering;m_ScriptablePassCreateMesh new CustomRenderPassCreateMesh();m_ScriptablePassCreateMesh._Material new Material(shaderMesh);m_ScriptablePassCreateMesh.renderPassEvent RenderPassEvent.AfterRenderingOpaques;}// 这里你可以在渲染器中注入一个或多个渲染通道。//每一帧都执行public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){//把实例化的CustomRenderPass插入渲染管线renderer.EnqueuePass(m_ScriptablePassPost);renderer.EnqueuePass(m_ScriptablePassCreateMesh);}
}实现效果 知识点RenderPassEvent控制渲染的顺序上图我们可以看到创建的线是可以被模型遮挡和遮挡模型的。但是如果把m_ScriptablePassCreateMesh.renderPassEventRenderPassEvent.AfterRendering 就会发现线完全遮挡模型即线最后渲染 四、渲染画面到图片
关键词
1、GetTemporaryRT
获取临时渲染纹理
可使用给定参数创建临时渲染纹理并使用 nameID 将其设置为全局着色器属性。使用 Shader.PropertyToID创建整数名称。
2、Shader.PropertyToID
获取着色器属性名称的唯一标识符。
static string RtName _TestRT;
static int RT_ID Shader.PropertyToID(RtName);简单实现
同样接着上一个CustomRenderPassFeatureTest写同时实现后处理和网格创建 using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CustomRenderPassFeatureTest : ScriptableRendererFeature
{//结构说明class CustomRenderPass : ScriptableRenderPass{// 在执行渲染通道之前调用// 创建临时渲染目标纹理。//为Execute提前准备需要的RenderTexture或者其它变量public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData) {}//核心方法实现这个renderPass的逻辑public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){}//释放在OnCameraSetup里声明的变量如TemporaryRenderTexturepublic override void OnCameraCleanup(CommandBuffer cmd){}}//后处理效果class CustomRenderShaderPostPass : ScriptableRenderPass{ //定义渲染材质通过Create方法赋值public Material _Material;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//创建一个CommandBufferCommandBuffer cmd CommandBufferPool.Get(ShowShader);//这里有一个疑问渲染标识符不管怎么传都不影响结果cmd.Blit(colorAttachment, RenderTargetHandle.CameraTarget.Identifier(), _Material);//执行CommandBuffercontext.ExecuteCommandBuffer(cmd);//回收CommandBufferCommandBufferPool.Release(cmd);}}//创建网格class CustomRenderPassCreateMesh : ScriptableRenderPass{public Material _Material;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){CommandBuffer cmd CommandBufferPool.Get(CreateMesh);cmd.DrawMesh(CreateMesh(), Matrix4x4.identity, _Material);context.ExecuteCommandBuffer(cmd);CommandBufferPool.Release(cmd);}//创建网格Mesh CreateMesh(){Mesh mesh new Mesh();mesh.vertices new Vector3[4] { new Vector3(1, 1, 1), new Vector3(-1, 1, 1), new Vector3(-1, 1, -1), new Vector3(1, 1, -1) };int[] indices new int[8] { 0, 1, 1, 2, 2, 3, 3, 0 };mesh.SetIndices(indices, MeshTopology.Lines, 0);return mesh;}}//渲染画面class CustomRenderPassRT : ScriptableRenderPass{static string RtName _TestRT;//获取着色器属性名称的唯一标识符。static int RT_ID Shader.PropertyToID(RtName);public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData){//新建一个RenderTextureDescriptorRenderTextureDescriptor textureDescriptor new RenderTextureDescriptor(1920, 1080, RenderTextureFormat.Default, 0);//获取临时渲染纹理cmd.GetTemporaryRT(RT_ID, textureDescriptor);}public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){CommandBuffer cmd CommandBufferPool.Get(ShowRT);//下面三段实现效果一样cmd.Blit(renderingData.cameraData.renderer.cameraColorTarget, RT_ID);// cmd.Blit(RenderTargetHandle.CameraTarget.Identifier(), RT_ID);// cmd.Blit(colorAttachment, RT_ID);context.ExecuteCommandBuffer(cmd);CommandBufferPool.Release(cmd);}public override void OnCameraCleanup(CommandBuffer cmd){cmd.ReleaseTemporaryRT(RT_ID);}}CustomRenderShaderPostPass m_ScriptablePassPost;CustomRenderPassCreateMesh m_ScriptablePassCreateMesh;CustomRenderPassRT m_ScriptablePassRenderTextrue;public Shader shaderPost;public Shader shaderMesh;/// inheritdoc/public override void Create(){#region 后处理效果m_ScriptablePassPost new CustomRenderShaderPostPass();//通过创建一个渲染材质m_ScriptablePassPost._Material new Material(shaderPost);//定义渲染的位置m_ScriptablePassPost.renderPassEvent RenderPassEvent.AfterRendering;#endregion#region 创建网格m_ScriptablePassCreateMesh new CustomRenderPassCreateMesh();m_ScriptablePassCreateMesh._Material new Material(shaderMesh);m_ScriptablePassCreateMesh.renderPassEvent RenderPassEvent.AfterRenderingOpaques;#endregion#region 渲染画面m_ScriptablePassRenderTextrue new CustomRenderPassRT();m_ScriptablePassRenderTextrue.renderPassEvent RenderPassEvent.AfterRendering;#endregion}// 这里你可以在渲染器中注入一个或多个渲染通道。//每一帧都执行public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){//把实例化的CustomRenderPass插入渲染管线renderer.EnqueuePass(m_ScriptablePassRenderTextrue);renderer.EnqueuePass(m_ScriptablePassPost);renderer.EnqueuePass(m_ScriptablePassCreateMesh);}
}五、RenderFeatrue参数赋值
1、VolumeComponent
在Volume中提供Render Feature读取参数数据通过VolumeManager单列拿到stack可以直接取得Volume中的数据。
以修改上文后处理的饱和度和对比度为例
1创建一个全局的Global Volume
右击Hierarchy面板空白处选择Volume→Global Volume
2自定义一个VolumeComponent
using UnityEngine.Rendering;public class VolumeComponentTest : VolumeComponent
{public ClampedFloatParameter Saturation new ClampedFloatParameter(1f, 0, 3);public ClampedFloatParameter Contrast new ClampedFloatParameter(1f, 0, 3);
}可以在Volume中添加VolumeComponentTest组件 3在shader中添加控制的参数
这添加了Saturation和Contrast两个控制参数
Shader Unlit/SaturationContrastShader
{Properties{_Saturation(Saturation, Range(0, 3)) 1.0_Contrast(Contrast, Range(0, 3)) 1.0}SubShader{Pass{ZTest Always ZWrite OffCGPROGRAM#pragma vertex vert_img // 使用内置的vert_img顶点着色器#pragma fragment frag#include UnityCG.cgincfloat _Saturation;float _Contrast;sampler2D _CameraColorTexture; //饱和度fixed3 Saturation_float(float3 In, float Saturation){float luma dot(In, float3(0.2126729, 0.7151522, 0.0721750));return luma.xxx Saturation.xxx * (In - luma.xxx);}//对比度fixed3 Contrast_float(float3 In, float Contrast){float midpoint pow(0.5, 2.2);return (In - midpoint) * Contrast midpoint;}fixed4 frag (v2f_img i) : SV_Target{fixed4 col tex2D(_CameraColorTexture, i.uv);fixed3 Saturation Saturation_float(col, _Saturation);fixed3 Contrast Saturation_float(Saturation, _Contrast);return fixed4(Contrast.x, Contrast.y, Contrast.z,0.1);}ENDCG}}FallBack Off
}用shaderGraph实现的也是一样的添加两个参数 4在RenderFeatrue中读取参数
对CustomRenderShaderPostPass修过如下 class CustomRenderShaderPostPass : ScriptableRenderPass{ //定义渲染材质通过Create方法赋值public Material _Material;//定义一个VolumeComponentTestVolumeComponentTest volumeComponentTest;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//读取VolumeManager的单列取得stackvar stack VolumeManager.instance.stack;//为volumeComponentTest赋值volumeComponentTest stack.GetComponentVolumeComponentTest();if (!volumeComponentTest) return;//直接从volumeComponentTest中读取数据_Material.SetFloat(_Saturation, volumeComponentTest.Saturation.value);_Material.SetFloat(_Contrast, volumeComponentTest.Contrast.value);//创建一个CommandBufferCommandBuffer cmd CommandBufferPool.Get(ShowShader);//这里有一个疑问渲染标识符不管怎么传都不影响结果cmd.Blit(colorAttachment, RenderTargetHandle.CameraTarget.Identifier(), _Material);//执行CommandBuffercontext.ExecuteCommandBuffer(cmd);//回收CommandBufferCommandBufferPool.Release(cmd);}}实现效果 2、代码直接赋值
在RenderFeatrue中开放参数用代码直接赋值
以后处理的饱和度和对比度为例
1开放参数
在CustomRenderPassFeatureTest和CustomRenderShaderPostPass下分别定义饱和度和对比度并赋值
public class CustomRenderPassFeatureTest : ScriptableRendererFeature
{//后处理效果class CustomRenderShaderPostPass : ScriptableRenderPass{ //定义渲染材质通过Create方法赋值public Material _Material;public float _Contrast;public float _Saturation;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){_Material.SetFloat(_Saturation, _Saturation);_Material.SetFloat(_Contrast, _Contrast);//创建一个CommandBufferCommandBuffer cmd CommandBufferPool.Get(ShowShader);//这里有一个疑问渲染标识符不管怎么传都不影响结果cmd.Blit(colorAttachment, RenderTargetHandle.CameraTarget.Identifier(), _Material);//执行CommandBuffercontext.ExecuteCommandBuffer(cmd);//回收CommandBufferCommandBufferPool.Release(cmd);}}CustomRenderShaderPostPass m_ScriptablePassPost;public Shader shaderPost;public float Saturation;public float Contrast;/// inheritdoc/public override void Create(){#region 后处理效果m_ScriptablePassPost new CustomRenderShaderPostPass();//通过创建一个渲染材质m_ScriptablePassPost._Material new Material(shaderPost);//将饱和度和对比度赋值给CustomRenderShaderPostPassm_ScriptablePassPost._Contrast Contrast;m_ScriptablePassPost._Saturation Saturation;//定义渲染的位置m_ScriptablePassPost.renderPassEvent RenderPassEvent.AfterRendering;#endregion}// 这里你可以在渲染器中注入一个或多个渲染通道。//每一帧都执行public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){//把实例化的CustomRenderPass插入渲染管线renderer.EnqueuePass(m_ScriptablePassPost);}
}2对参数进行修改
//得到RenderFeatrue
CustomRenderPassFeatureTest customrenderData.rendererFeatures.OfTypeCustomRenderPassFeatureTest().FirstOrDefault();
//对值进行修改
custom.Saturation 0;
custom.Contrast 0;
//设置数据
custom.SetParam();
