英伟达VRS，通过改变帧的不同区域的着色速率来提高渲染性能和质量。

下载SDK：Unity 应用商店>>Vive Foveated Rendering

导入插件：在摄像机上挂载ViveFoveatedRendering脚本 勾选Manual Adjustment 选择适合自己的渲染方式

这个脚本我用Google翻译了一下

//========= Copyright , HTC Corporation. All rights reserved. ===========using UnityEngine;using UnityEngine.Rendering;using UnityEngine.XR;using System;namespace HTC.UnityPlugin.FoveatedRendering{public static class FoveatedRenderingExtensions{public static T Clamp<T>(this T input, T min, T max) where T : IComparable{if (pareTo(input) > 0){ return min; }else if (pareTo(input) < 0){ return max; }return input;}}[RequireComponent(typeof(Camera))]public class ViveFoveatedRendering : MonoBehaviour{Camera thisCamera = null;CommandBufferManager commandBufferMgr = new CommandBufferManager();bool foveatedRenderingInited = false;bool foveatedRenderingActivated = false;RenderMode renderMode = RenderMode.RENDER_MODE_MONO;[SerializeField][Header("手动调整")]bool manualAdjustment = false;[SerializeField][Header("阴影率预设")]ShadingRatePreset shadingRatePreset = ShadingRatePreset.SHADING_RATE_HIGHEST_PERFORMANCE;[SerializeField][Header("模式预设")]ShadingPatternPreset patternPreset = ShadingPatternPreset.SHADING_PATTERN_NARROW;[SerializeField][Header("内区半径")]Vector2 innerRegionRadii = new Vector2(0.25f, 0.25f);[SerializeField][Header("中区半径")]Vector2 middleRegionRadii = new Vector2(0.33f, 0.33f);[SerializeField][Header("外区半径")]Vector2 peripheralRegionRadii = new Vector2(1.0f, 1.0f);[SerializeField][Header("内区阴影")]ShadingRate innerShadingRate = ShadingRate.X1_PER_PIXEL;[SerializeField][Header("中区阴影")]ShadingRate middleShadingRate = ShadingRate.X1_PER_2X2_PIXELS;[SerializeField][Header("外区阴影")]ShadingRate peripheralShadingRate = ShadingRate.X1_PER_4X4_PIXELS;/// <summary>/// 启用中心渲染/// </summary>/// <param name="activate"></param>public void EnableFoveatedRendering(bool activate){if (foveatedRenderingInited && activate != foveatedRenderingActivated){foveatedRenderingActivated = activate;if (activate){commandBufferMgr.EnableCommands(thisCamera);}else{commandBufferMgr.DisableCommands(thisCamera);}}}/// <summary>/// 设置阴影率预设/// </summary>/// <param name="inputPreset"></param>public void SetShadingRatePreset(ShadingRatePreset inputPreset){if (foveatedRenderingInited){shadingRatePreset = inputPreset.Clamp(ShadingRatePreset.SHADING_RATE_HIGHEST_PERFORMANCE, ShadingRatePreset.SHADING_RATE_MAX);ViveFoveatedRenderingAPI.SetFoveatedRenderingShadingRatePreset(shadingRatePreset);if (shadingRatePreset == ShadingRatePreset.SHADING_RATE_CUSTOM){SetShadingRate(TargetArea.INNER, innerShadingRate);SetShadingRate(TargetArea.MIDDLE, middleShadingRate);SetShadingRate(TargetArea.PERIPHERAL, peripheralShadingRate);}GL.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.UPDATE_GAZE);}}/// <summary>/// 阴影率预设/// </summary>/// <returns></returns>public ShadingRatePreset GetShadingRatePreset(){return shadingRatePreset;}/// <summary>/// 设置模式预设/// </summary>/// <param name="inputPreset"></param>public void SetPatternPreset(ShadingPatternPreset inputPreset){if (foveatedRenderingInited){patternPreset = inputPreset.Clamp(ShadingPatternPreset.SHADING_PATTERN_WIDE, ShadingPatternPreset.SHADING_PATTERN_MAX);ViveFoveatedRenderingAPI.SetFoveatedRenderingPatternPreset(patternPreset);if (patternPreset == ShadingPatternPreset.SHADING_PATTERN_CUSTOM){SetRegionRadii(TargetArea.INNER, innerRegionRadii);SetRegionRadii(TargetArea.MIDDLE, middleRegionRadii);SetRegionRadii(TargetArea.PERIPHERAL, peripheralRegionRadii);}GL.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.UPDATE_GAZE);}}/// <summary>/// 阴影模式预设/// </summary>/// <returns></returns>public ShadingPatternPreset GetPatternPreset(){return patternPreset;}/// <summary>/// 设置阴影/// </summary>/// <param name="targetArea"></param>/// <param name="rate"></param>public void SetShadingRate(TargetArea targetArea, ShadingRate rate){if (foveatedRenderingInited){var clampedRate = rate.Clamp(ShadingRate.CULL, ShadingRate.X1_PER_4X4_PIXELS);switch (targetArea){case TargetArea.INNER:innerShadingRate = clampedRate;break;case TargetArea.MIDDLE:middleShadingRate = clampedRate;break;case TargetArea.PERIPHERAL:peripheralShadingRate = clampedRate;break;}ViveFoveatedRenderingAPI.SetShadingRate(targetArea, clampedRate);GL.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.UPDATE_GAZE);}}/// <summary>/// 阴影/// </summary>/// <param name="targetArea"></param>/// <returns></returns>public ShadingRate GetShadingRate(TargetArea targetArea){switch (targetArea){case TargetArea.INNER:return innerShadingRate;case TargetArea.MIDDLE:return middleShadingRate;case TargetArea.PERIPHERAL:return peripheralShadingRate;}return ShadingRate.CULL;}/// <summary>/// 设置区域半径/// </summary>/// <param name="targetArea"></param>/// <param name="radii"></param>public void SetRegionRadii(TargetArea targetArea, Vector2 radii){if (foveatedRenderingInited){var clampedRadii = new Vector2(radii.x.Clamp(0.01f, 10.0f), radii.y.Clamp(0.01f, 10.0f));switch (targetArea){case TargetArea.INNER:innerRegionRadii = clampedRadii;break;case TargetArea.MIDDLE:middleRegionRadii = clampedRadii;break;case TargetArea.PERIPHERAL:peripheralRegionRadii = clampedRadii;break;}ViveFoveatedRenderingAPI.SetRegionRadii(targetArea, clampedRadii);GL.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.UPDATE_GAZE);}}/// <summary>/// 获取区域半径/// </summary>/// <param name="targetArea"></param>/// <returns></returns>public Vector2 GetRegionRadii(TargetArea targetArea){switch (targetArea){case TargetArea.INNER:return innerRegionRadii;case TargetArea.MIDDLE:return middleRegionRadii;case TargetArea.PERIPHERAL:return peripheralRegionRadii;}return Vector2.zero;}void OnEnable(){ViveFoveatedRenderingAPI.InitializeNativeLogger(str => Debug.Log(str));thisCamera = GetComponent<Camera>();foveatedRenderingInited = ViveFoveatedRenderingAPI.InitializeFoveatedRendering(thisCamera.fieldOfView, thisCamera.aspect);if (foveatedRenderingInited){var currentRenderingPath = thisCamera.actualRenderingPath;if (currentRenderingPath == RenderingPath.Forward){commandBufferMgr.AppendCommands("Enable Foveated Rendering", CameraEvent.BeforeForwardOpaque,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.ENABLE_FOVEATED_RENDERING),buf => buf.ClearRenderTarget(false, true, Color.black));commandBufferMgr.AppendCommands("Disable Foveated Rendering", CameraEvent.AfterForwardAlpha,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.DISABLE_FOVEATED_RENDERING));}else if (currentRenderingPath == RenderingPath.DeferredShading){commandBufferMgr.AppendCommands("Enable Foveated Rendering - GBuffer", CameraEvent.BeforeGBuffer,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.ENABLE_FOVEATED_RENDERING),buf => buf.ClearRenderTarget(false, true, Color.black));commandBufferMgr.AppendCommands("Disable Foveated Rendering - GBuffer", CameraEvent.AfterGBuffer,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.DISABLE_FOVEATED_RENDERING));commandBufferMgr.AppendCommands("Enable Foveated Rendering - Alpha", CameraEvent.BeforeForwardAlpha,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.ENABLE_FOVEATED_RENDERING));commandBufferMgr.AppendCommands("Disable Foveated Rendering - Alpha", CameraEvent.AfterForwardAlpha,buf => buf.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.DISABLE_FOVEATED_RENDERING));}EnableFoveatedRendering(true);bool isEyeTracked = ViveFoveatedGazeUpdater.AttachGazeUpdater(gameObject);if (manualAdjustment || (!ViveFoveatedInitParam.SetParamByHMD(this, isEyeTracked))){SetShadingRatePreset(shadingRatePreset);SetPatternPreset(patternPreset);}ViveFoveatedRenderingAPI.SetNormalizedGazeDirection(new Vector3(0.0f, 0.0f, 1.0f), new Vector3(0.0f, 0.0f, 1.0f));GL.IssuePluginEvent(ViveFoveatedRenderingAPI.GetRenderEventFunc(), (int)EventID.UPDATE_GAZE);}}void OnDisable(){EnableFoveatedRendering(false);commandBufferMgr.ClearCommands();ViveFoveatedRenderingAPI.ReleaseFoveatedRendering();ViveFoveatedRenderingAPI.ReleaseNativeLogger();foveatedRenderingInited = false;var gazeUpdater = GetComponent<ViveFoveatedGazeUpdater>();if (gazeUpdater != null){gazeUpdater.enabled = false;}}void OnPreRender(){if (XRSettings.enabled){switch (XRSettings.stereoRenderingMode){case XRSettings.StereoRenderingMode.MultiPass:renderMode = thisCamera.stereoActiveEye == Camera.MonoOrStereoscopicEye.Left ?RenderMode.RENDER_MODE_LEFT_EYE : RenderMode.RENDER_MODE_RIGHT_EYE;break;case XRSettings.StereoRenderingMode.SinglePass:renderMode = RenderMode.RENDER_MODE_STEREO;break;default:renderMode = RenderMode.RENDER_MODE_MONO;break;}}else{renderMode = RenderMode.RENDER_MODE_MONO;}ViveFoveatedRenderingAPI.SetRenderMode(renderMode);}}}