UE4 is going to use the DirectX version of Ray Tracing, nothing built into the engine in UE4 is exclusive to Nvidia or AMD. Expect it in 4.22 “by the end of the year”.
VXGI is Nvidia exclusive, is a bit more limited in what it can be used for, and there’s more resolution/accuracy problems.
Ah, dang, that’s not really super useful for me. Hopefully it will be expanded to include more than just lightmap textures eventually.
That’s the plan, just not this release. 
Paper2d is in maintenance mode only… No need features are planned… Do a search here in forums to find the official thread on it…
teak
Suggestion for Epic: Having highlighted settings/features in each engine version. Toggle on/off at startup or project settings.
Does this include support for the HoloLens aswell?
Thanks for the great knowledge: na
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Lighting updates sound great, can’t wait to get these put into play! Final release set for mid-late November?
FTexture2DArrayRHIRef instead of FTexture2DRHIRef works as you would expect. Just declare it as e.g. RWTexture2DArray instead of RWTexture2D in the shader file itself and you can access the slices with the Z coordinate. Creating a new Array works with CreateTexture2DArray from FRHICommandListImmediate.
Or did you mean UTexture Arrays?
edit:
Aww, I was so hyped already!
I also second this question. Does the added “Mixed Reality Support” also include HoloLens?
Is there any word on whether the ‘Polygon Modeling with Subdiv Surfaces’ and/or ‘Advanced Programmatic Mesh Creation’ features listed on the roadmap will make it into 4.21? I’d give one of my teeth to understand the direction the high-level geometry stuff is going. Er, ok maybe one of my kid’s fallen out baby-teeth, we have quite a collection of those…
UE 4.21 is “feature complete” at this point, meaning we are only focused on fixing any issues with features before the release occurs.
On the UE4 Roadmap, the “Future Releases” deck does not apply to UE 4.21 at this point.
Any chance you would know the answer to the question I asked? “Does the added “Mixed Reality Support” also include HoloLens?”
Lol that master pose component feature would have been really useful a year ago, don’t need it any more cause I had to find a work around
In short, it should just work but I’m not expecting the feature to be useful for real-time ray-tracing. Maybe you could use it for high-quality screenshots of your games, but realistically, if you’re interested in ray tracing, you’re going to have to wait for AMD to implement their equivalent to RTX… I mean, it would be awesome if by some miracle, AMD manages to get ray tracing via DXR running at playable frame rates without needing to add additional hardware and this could just come for free to existing Vega card owners, but I just can’t see it happening.
Does 4.21 fix the issue with broken Vehicle Replication?
Im honestly just interested in teh lightmap baking… Super fast lightmap baking would be incredable…
thanks ill give this a try
Any news about host migration?
UPDATE!
We have just released Preview 2 for 4.21! Thank you for your continued help in testing the 4.21 build before its official release. As a reminder, the Preview builds are for testing only, and should not be used for the active development of your project.
For a list of known issues affecting this latest preview, please follow the links provided on the first post in this thread.
Fixed in Preview 2
Fixed! UE-62048 GitHub 4892 : HLOD System: Fix crash when static mesh has no valid material
Fixed! UE-60607 Crash when trying to “Update Mesh Section” on any procedural mesh just after “Clear Mesh Section” and “Create Mesh Section” for different vertices and triangles.
Fixed! UE-64870 Animation State Preview Window Jitters with certain states
Fixed! UE-65109 Odd scrollbar under the Notifies timeline in the Animation Editor
Fixed! UE-63634 Crash When Substance Material Is Applied to a Mesh In HLOD System
Fixed! UE-63843 New Audio Engine Crashes on Game Start
Fixed! UE-64871 CLion is not able to open code projects Content is not allowed in prolog for misc xml file
Fixed! UE-65050 The InsertFeaturePacksIntoINIFile() function creates an invalid entry in the DefaultGame.ini file
Fixed! UE-64466 FTransform(ENoInit) ensures in Debug on mobile platforms
Fixed! UE-64616 Cook On the fly crashes when deleted Asset is being referenced
Fixed! UE-64960 Validating Data background task happens on Cook
Fixed! UE-65103 RunUAT.bat StreamCopyDescription triggered spurious swarm review
Fixed! UE-65250 Console Files being generated in Intermediates after opening Binary Editor
Fixed! UE-64996 Opening Visual Studio Solution gives Incomplete Configuration warning
Fixed! UE-65159 Empty Invalid folders are placed in the root UE4 folder
Fixed! UE-65024 Packaging for Mac in shipping configuration fails
Fixed! UE-64148 Remote standalone build of a project fails due to incorrect path to project’s Info.plist file
Fixed! UE-65219 Remote compile for iOS from Windows fails: Unable to load XML config cache
Fixed! UE-65163 Fails to Generate Project files
Fixed! UE-59288 Building a Client solution configuration does not work for projects without a client target
Fixed! UE-65118 Multiple Engine Applications are using Default Windows Icons
Fixed! UE-64022 ActionRPG fails to package - UMeshDescription about to be deprecated
Fixed! UE-64949 Warning opening QAGame maps, Linear color curves now accurately handle RGB values > 1. If you were relying on HSV clamping, please update CurveLinearColor_0
Fixed! UE-64799 Mesh Proxy LOD can’t be called from Blueprint because MeshProxySettings in not exposed
Fixed! UE-64526 Accuracy issues with Jacketing mesh
Fixed! UE-64522 Crash in Jacketing mesh
Fixed! UE-64990 Set the Variant Manager plugin as beta in 4.21
Fixed! UE-64948 Variant Manager switch has no effect from UMG widget
Fixed! UE-64812 Rectangle selection in Static Mesh Edit Mode is offset
Fixed! UE-56714 EXR and HDR set to Auto Gamma are Gamma corrected
Fixed! UE-64366 [Rhino Import]-[Rhino Blocks]-Incorrect Rhino Blocks position on import
Fixed! UE-65114 Datasmith importer - Wrong indice assigned to material slots
Fixed! UE-65149 Datasmith import - linear texture is read as sRGB
Fixed! UE-64982 VRed - Crash importing a scene - Assertion failed: Pair != nullptr
Fixed! UE-65191 Update Virtual studio sample for 4.21
Fixed! UE-65113 Can’t package project with Aja and/or Blackmagic
Fixed! UE-65148 vrCluster fails to start
Fixed! UE-65069 nDisplay plugin must stay in beta
Fixed! UE-64371 PixelStreaming - Cirrus SignallingWebServer Example start stream as white
Fixed! UE-64216 PixelStreaming - Second streaming connection is difficult
Fixed! UE-64607 Cannot save level after using BP_SunPosition
Fixed! UE-65008 Editor may crash during PIE when watching variables in blueprint debugger after a breakpoint is hit
Fixed! UE-65005 Crash when selecting object hyperlink in Blueprint Debugger after hitting a breakpoint in PIE
Fixed! UE-64770 AssetManager does not correctly call delegates if bShouldUseSynchronousLoad is true
Fixed! UE-63705 Deleting actor referenced by foliage/landscape causes warning
Fixed! UE-63825 GitHub 5073 : Implement LoadGameFromMemory function.
Fixed! UE-63786 Crash When Trying to Set Default Values to a Structure That Includes a Transform Variable
Fixed! UE-65038 Navmesh generation of landscape is broken for large agents
Fixed! UE-60987 NavModifierComponent can’t correctly expand NavArea depending on the rotation value of Actor
Fixed! UE-62991 NavigationSystemConfig doesn’t respect GEngine->NavigationSystemClassName
Fixed! UE-65011 (Regression) Nativizing a Blueprint results in data loss
Fixed! UE-64893 Crash when clicking Step Out after triggering a break point
Fixed! UE-64816 Removing a parameter from a blueprint function in a library can cause actor classes calling it to lose their parent or instance data
Fixed! UE-65098 Crash when debugging a blueprint and then stepping out into an anim blueprint
Fixed! UE-65000 Assign Event On Destroyed no longer creates Custom Event Node
Fixed! UE-64895 Hitting Stop after Blueprint Debugging Break Point in Level Blueprint’s Event Begin Play crashes the Editor
Fixed! UE-62134 Crash reloading a blueprint after undoing the deletion of a function containing a math expression node
Fixed! UE-64959 Calling LoadLevel within OnLevelShown delegates causes an array modification during range-for iteration assertion
Fixed! UE-63879 The new createsocket code should remove the bForceUDP before 4.21 goes out
Fixed! UE-63543 Find Session times out when run while in a Steam Session
Fixed! UE-63791 HTML5 cannot connect to local Windows server
Fixed! UE-64999 Editor crashes when attempting to play a recorded demo - Assertion failed: IsGameWorld() && GetCurrentLevel()
Fixed! UE-64156 Online Auth resends can trigger overflows
Fixed! UE-62951 Cloth simulation doesn’t work correctly if Compute Skin Cache is ON.
Fixed! UE-61879 Crash opening the editor while Target Manager is open
Fixed! UE-64785 Renaming Texture Asset crashes editor with invalid attempt to write memory
Fixed! UE-64506 UE4Editor does not start when there are no audio devices available
Fixed! UE-52313 iOS: Refraction causes rendering artifacts when MSAA is enabled
Fixed! UE-65041 Cannot deploy to iOS when your editor source code preference is set to anything other than Xcode
Fixed! UE-65057 Launch.cpp and AndroidMoviePlayer.cpp fail to compile for Android Intel 64-bit
Fixed! UE-64937 IphonePackager cannot verify UDID on new devices (XS or newer)
Fixed! UE-65054 Android intel x86 option is still available for compiling
Fixed! UE-64603 Android Devices do not show up in device list for Device Output Log
Fixed! UE-65047 iOS: Build Step Contains Commandline Argument of “–minimum-deployment-target 9.0” Despite iOS 9 Being Deprecated
Fixed! UE-64318 Projects packaged with ES3 crash on the Sheild Tablet
Fixed! UE-64326 Projects packaged with crash on the Sheild Tablet
Fixed! UE-65015 HTML5: Project Crashes During Launching Engine due to “Texture format ‘R8G8B8A8_UINT’ not supported”
Fixed! UE-64245 SceneDepth failed with MSAA on PC Mobile Preview
Fixed! UE-64018 iOS 9 Deprecation is not complete
Fixed! UE-63963 Fix FSystemTextures.InitializeTextures initialization ordering
Fixed! UE-64860 Remote building is failing with rsync errors due to permission being denied
Fixed! UE-60733 IPP is unusable with the latest Windows Store version of iTunes
Fixed! UE-61698 Android + Bluetooth Mouse: Hover events and Get Mouse Position on Viewport not working
Fixed! UE-64624 App fails to open when packaged for Distribution - Android
Fixed! UE-65075 Binary iOS/TVOS remote build fails with rsync errors
Fixed! UE-58528 GitHub 4708 : Update APK maximum size tooltip
Fixed! UE-53944 [CrashReport] UE4Editor_Engine!FHierarchicalStaticMeshSceneProxy::GetDynamicMeshElements() hierarchicalinstancedstaticmesh.cpp:1431
Fixed! UE-47446 Linux UE4Editor crash when opening the second convert project window with
Fixed! UE-65096 Crash zooming out in Top Down Wireframe mode
Fixed! UE-65220 Handled Ensure opening Project Launcher FinalLayout == ImageLayout
Fixed! UE-65221 FVulkanPipelineStateCacheManager Error opening Project Launcher with
Fixed! UE-64930 DBuffer Decals Don’t Render Emissive Color if GBuffer Decals Are Also Rendering
Fixed! UE-64374 Lighting can disappear during Intro_Sequence_P when viewing the yellow vehicle from different angles.
Fixed! UE-64707 Foliage Lightmaps Are Incorrect When Using a Precomputed Lighting Scenario
Fixed! UE-64866 [CrashReport] UE4Editor_Renderer!FRenderingCompositePassContext::IsViewFamilyRenderTarget() [renderingcompositiongraph.cpp:185]
Fixed! UE-62426 Flickering Meshes after removing HISM instances
Fixed! UE-60169 [CrashReport] UE4Editor_Renderer!FMaterialShader::SetParametersInner<FRHIVertexShader * __ptr64>() [shaderbaseclasses.cpp:181]
Fixed! UE-48040 [CrashReport] UE4Editor_Renderer!FUniformMeshConverter::Convert()
Fixed! UE-57889 Package Build Fails with RenderDoc plugin enabled. Unable to initialize the plugin because no RenderDoc libray
Fixed! UE-64571 Volume Textures with LOD Bias displays random colors in packaged game
Fixed! UE-63014 Android - First Person template package from Mac crashes on device - LogAndroid: Error: Fatal error: VulkanUtil.cpp [Line: 614]
Fixed! UE-51746 HISM’s culling distance is affected by the ScreenSize of LOD.
Fixed! UE-64123 Building Lighting hangs and eventually fails
Fixed! UE-64155 Setting r.ScreenPercentage to very low values crashes the editor
Fixed! UE-60376 InfiltratorDemo crashes when launched with - - Unhandled Exception: EXCEPTION_ACCESS_VIOLATION
Fixed! UE-59372 Target RHI list is outdated in the project settings
Fixed! UE-64680 Entire level is over-saturated with lights and shadows.
Fixed! UE-64994 Unable to find Brush for sequencer scrub handles warning appears when opening debug editor
Fixed! UE-65020 When converting matinee tracks, tangents are not copied properly
Fixed! UE-65055 Actor to Track in LookAt Tracking Settings of Cinematic Camera missing key icon
Fixed! UE-65013 UE4Editor ControlRig multicast delegate crash when closing
Fixed! UE-64991 ImageWriteQueue - Crash when recording a Media Player - Assertion failed: ~TPromiseBase<bool>()
Fixed! UE-64945 Cannot add a Live Link Track to a sequence
Fixed! UE-64813 Nested actors trajectories in the wrong location
Fixed! UE-65088 Asset names are not properly exported from Sequencer
Fixed! UE-65039 Unable to select Level Sequences to trigger in Sequence Recorder due to “LogProperty: Warning: Illegal TEXT reference to a private object in external package”
Fixed! UE-65184 SequencerScripting sample ‘sequencer_examples.py’ missing module ‘sequencer_key_samples’ - fails to execute
Fixed! UE-65123 Unable to create new keyframes using Alt + Drag
Fixed! UE-65112 Crash occurs when attempting to undo multiple duplicated keyframes
Fixed! UE-64635 Validating Data messages spam when launching on Linux
Fixed! UE-64931 Unable to Create assets via Create new Asset in asset picker
Fixed! UE-64458 Crash adding a point to Color Over Life after using the Reset to Default arrow
Fixed! UE-64499 [CrashReport] UE4Editor_CoreUObject!UObjectBaseUtility::GetOutermost() [uobjectbaseutility.cpp:121]
Fixed! UE-61474 GitHub 4854 : UE-61432: Add FScopedTransaction to SetEditConditionState
Fixed! UE-65160 Broken Visibility when Copy-Pasting Actors From Hidden Layers
Fixed! UE-64421 Material editor: Static switch parameters can no longer share the same name
Fixed! UE-64525 Crash when duplicating an asset before renaming it in the Content Browser
Fixed! UE-61432 Inline edit conditions don’t support undo
Fixed! UE-64704 Print String not printing to screen when simulating
Fixed! UE-63637 Instance Static Mesh instance doubles when upgrading from 4.18 to 4.19 or higher
Fixed! UE-63123 Static HISM gets corrupted lightmap after building lighting if using Lighting Scenario
Fixed! UE-63242 Update Instance Transform Rotation for HISM isn’t working in a packaged game
Fixed! UE-63631 Switching FOV caused NaN(divide by 0) in landscape LOD computation(Mobile)
Fixed! UE-63831 [CrashReport] UE4Editor_Landscape!FLandscapeStaticLightingMesh::GetHeightmapData() [landscapelight.cpp:416]
Fixed! UE-64287 Editor crashes when creating a Material Function Instance
Fixed! UE-65242 The Material Editor Details Panel is not marked as closed when closed by the user
Fixed! UE-64422 Auto renaming duplicated parameters within the material editor slows down production
Fixed! UE-61129 imageStore no matching overloaded function found error when packaging ContentExamples
Fixed! UE-64735 Skeletal mesh sampling doesn’t work correctly on meshes without vertex colors
Fixed! UE-65089 Niagara: Add a texture sample example
Fixed! UE-64868 Template thumbnails do not load in the New Emitter Wizard until a template is selected
Fixed! UE-60278 Hide Emitter Pin / Toggle options from the Niagara Emitter Editor
Fixed! UE-63969 Drag and drop from Parameters panel to create new Set Variable block
Fixed! UE-65199 Widget blueprint details continuously shift when moving objects in the widget designer
Fixed! UE-65002 Lumin binary install size has increased on Mac
Fixed! UE-64944 Move the AR samples to a more visible location Samples/AR
Fixed! UE-65056 OculusFunctionLibrary.cpp fails to compile for Android Intel 64-bit
Fixed! UE-64957 Resolve the Samples/FaceARsample and Samples/Sandbox/AR/FaceARSample discrepancy
Fixed! UE-64942 Material Switching in MRMesh
Fixed! UE-54503 Transparency for textures applied to the spectator screen for VR
Fixed! UE-64730 SteamVRInput: The editor should create empty default bindings files for common controller types when none are found
Fixed! UE-65026 ARVideoSettings - Get the video format that the application is running and display this information in the debug menu
Fixed! UE-65161 Left side of spectator screen renders completely white when mode set to Undistorted
Fixed! UE-65162 Spectator screen does not render camera view when mode is set to TexturePlusEye
Fixed! UE-65107 Orientations are inverted on GoogleAR
Fixed! UE-65165 Editor crash enabling ShowFlag.StereoRendering
Fixed! UE-64932 Change AREnvProbe metal settings to fix the z-fighting on iPads
Fixed! UE-64446 ARPG Crash With Garbage Collection Inbox
Fixed! UE-65240 Fix SDropTarget not using horizontal and vertical brush slate args
REMEMBER: Please report any new bugs you find by following the How To Report a Bug Guide