Unreal Engine 4.26 Preview

[InnervationBros]

I think the skylight settings in raytracing has changed. When I migrate from 4.25 to 4.26, the skylight is behaving completely different, and isnt providing lighting im getting in 4.25 (which is better lighting with more shadows. Anyone know what could be going on? I would really like to migrate to 4.26 for my project to use its new features when its officially done, but the raytraced skylight lighting has become an essential component for my animation project. Hopefully this is fixed!

4.25 Lighting with raytraced skylight.(ideal result)


4.26 Lighting with raytraced skylight.(not ideal)


Also I have been using the RTX Raytracing easy global settings plugin to manage my raytraced settings.
https://www.unrealengine.com/marketp...ttings-tweaker

[VictorLerp]

UPDATE!

We have just released Preview 7 for 4.26! Thank you for your continued help in testing the 4.26 build before its official release. As a reminder, the Preview builds are for testing only, and should not be used for active development of your project.

For a list of known issues affecting this latest preview, please follow the links provided on the original post in this thread.

REMEMBER: Please report any new bugs you find by following the How To Report a Bug Guide

Fixed in Preview 7
Fixed! UE-94345 Crash When Trying to Run Animation Insights for QAGame>TM-AnimInsights
Fixed! UE-102218 sync groups in blend spaces cause animation pop
Fixed! UE-102505 Crash exporting a spawnable
Fixed! UE-102567 Control Rig: In Level Editor, Alt-Drag clones mesh by mistake instead of just moving camera.
Fixed! UE-102329 Phantom keys remain on a track when they're all deleted
Fixed! UE-102566 Audio Render Thread hang in Quartz
Fixed! UE-102311 Submix effects can only process one effect in a chain
Fixed! UE-102379 Audio scheduling issue when using "BarRelative" counting: sound will be late on beat
Fixed! UE-102152 Spurious Cook Warning: LogCook: Warning: Unexpected change in PackageName when loading a requested package
Fixed! UE-100698 ContentExamples Crashes with IoStore Enabled on Mobile Devices
Fixed! UE-102553 Water: Clean up Caustics Textures
Fixed! UE-102342 Packaging failed for Inclusive Nativization and Build Configuration Shipping
Fixed! UE-95441 A hidden dedicated server is launched when playing as client
Fixed! UE-102401 Chaos Vehicle Plugin not working in -Game mode
Fixed! UE-94806 Cloth rendering crashes the engine when a cloth asset is assigned as the preview mesh of a ControlRig with a Set Translation
Fixed! UE-97935 Deprecation Message Needed for content that uses Destructible Actors
Fixed! UE-95511 ChaosDestructionDemo packages cannot be created in 4.25.1
Fixed! UE-102402 Chaos Cloth - Cloth disappears while simulating the ClothBall asset.
Fixed! UE-102065 Array index out of bounds crash when deactivating Cloth Paint after removing Max Distance mask
Fixed! UE-94490 Suspend Clothing Simulation Not Retaining Simulated State
Fixed! UE-101258 Physics Clothing - Can't apply Clothing Data to the selected section
Fixed! UE-102262 PSVR crashes on launch to TM-StereoLayers - referencing GnmContextCommon.cpp:1012
Fixed! UE-102373 Unable to create code projects from an installed build on Linux.
Fixed! UE-102493 ChaosDestructionDemo Editor does not open on Linux through Perforce build
Fixed! UE-101982 Mac projects open with MetalBundle AMDMTLBronzeDriver error
Fixed! UE-102407 Missing correct UAV transition in mobile eye adaptation pass
Fixed! UE-99380 Crash when enable mobile multi view and preview it with -game -featurelevelES31
Fixed! UE-101324 Mobile shaders should issue a warning when compiling unsupported shading models
Fixed! UE-102498 FreeType 2 for Android needs to be updated to 2.10.4
Fixed! UE-100922 LibPNG needs to be updated
Fixed! UE-101581 Git Reports Untracked Files in a Cloned Github Workspace After Packaging a Project for a Android
Fixed! UE-101064 Update libplaycore in GooglePAD to latest version
Fixed! UE-100327 QAGame with IoStore Enabled Crashes When Trying to Open Another Map
Fixed! UE-102354 Packaged projects with Mobile Forward Shading enabled crash on iOS
Fixed! UE-102136 Multiple Vulkan Khronos Validation Errors in ShooterGame
Fixed! UE-102709 Crash when selecting a texture index in RequiredTextureResolution viewmode.
Fixed! UE-102278 Point light that is not casting a shadow behind hair causes the hair to glow
Fixed! UE-102053 Crash when opening ContentExamples in Standalone Game
Fixed! UE-102576 Editing Water Bodies in DX12 makes the landscape explode
Fixed! UE-101105 Crash when press F5 key any Test build project
Fixed! UE-101685 Directional Stationary Light does not cast shadow on hair model
Fixed! UE-102116 Anisotropy pass always runs if material uses material attributes
Fixed! UE-102117 A specific combination of dynamic inputs causes ribbons to disappear
Fixed! UE-101570 Particle shadow casting not working in Content Examples -Effects map example 1.8
Fixed! UE-97114 Emitter level dependencies are incorrectly satisfied and break emitter
Fixed! UE-102490 4.26 effects fail to play properly over longer periods of time
Fixed! UE-102624 Perf display is showing nonsense values
Fixed! UE-102471 Dragging modules between systems and emitters wipes the modules settings
Fixed! UE-101698 Plugin content needs to be resaved before 4.26 release.
Fixed! UE-102522 Ray-traced directional light shadowing regression
Fixed! UE-96068 "REFLECTION CAPTURES NEED TO BE REBUILT" is displayed on a cooked game.
Fixed! UE-102316 Ensures while opening new TimeOfDay level on Linux: DepthStencilLayout == VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL and !bMultiviewRenderTargets || Texture->Surface.NumArrayLevels > 1
Fixed! UE-101555 Unable To Open Content Examples With -dx12 on Intel HD 630
Fixed! UE-101569 DX12 Error: ID3D12Device::CopyDescriptors: Source ranges and dest ranges overlap, which results in undefined behavior
Fixed! UE-102349 [Crashreporter] UE4Editor-D3D12RHI!FD3D12CommandListManager::ExecuteAndIncrementFence(FD3D12CommandListPayload &,FD3D12Fence &) [D3D12DirectCommandListManager.cpp:571]
Fixed! UE-97289 Tessellation and displacement are broken with Vulkan
Fixed! UE-102532 Crash when reimporting a UDIM texture with a new asset.
Fixed! UE-102513 Rare HLOD crash
Fixed! UE-102340 [CrashReporter] UE4Editor-UnrealEd!SkeletalMeshHelperImpl::RestoreLODInfo(TSharedPtr<FExistingSkelMeshData const ,0> const &,USkeletalMesh *,int) [SkeletalMeshImport.cpp:514]
Fixed! UE-102374 Fbx automation test generates warning.
Fixed! UE-102564 Missing scale for tangent with morph target
Fixed! UE-102618 GeometryCacheAbcFileComponent doesn't support relative path for its Alembic
Fixed! UE-102378 Crash when assigning material on GeometryCache
Fixed! UE-102613 Landscape is missing from high res screenshots
Fixed! UE-102632 BP brushes are not refreshed when moving the landscape
Fixed! UE-90559 Text 3D actor is missing thumbnail in the Place Actors panel
Fixed! UE-102504 nDisplay Picp crash when saving InCameraVFX level in Multi-User
Fixed! UE-102408 Crush on GetFixtureMatrixVisibility
Fixed! UE-102428 DMX - Fix fixture patch doesn't read DMX unless OnFixturePatchReceived was bound
Fixed! UE-102548 DMX Fixture - Matrix fixture pivot point is at the base which leads to odd rotations
Fixed! UE-102367 Templates Content - Update / Polish
Fixed! UE-102485 Crash: DMX monitor, SACN, setting Universe to 0
Fixed! UE-102637 DMX Crash opening library on Mac OSX.
Fixed! UE-102692 DMX - SendDMXRaw does not loopback internally when send or receive DMX is enabled
Fixed! UE-102389 View matrix calculation crash in nDisplay warp methods
Fixed! UE-102183 Remote Control API - Optionally allow force build webapp at startup
Fixed! UE-102128 Remote API - Crash when using web widget and exposed post process, play in editor.
Fixed! UE-102672 Remote Control API - Latest changes (11/06)
Fixed! UE-102297 Duplicating a level with a SimpleVirtualCamera results in an ensure
Fixed! UE-102345 Sequencer does not spawns green cubes (path) while adding new key on sequencer timeline in VR Editor
Fixed! UE-102574 Water Wave Asset gets out of sync with serialized data
Fixed! UE-102710 Water texture doesn't update when moving the landscape
Fixed! UE-94586 GitHub 7073 : 4.25 Hotfix Candidate
Fixed! UE-96467 vr.pixelDensity cvar scales the resolution inside the PSVR HMD
Fixed! UE-100747 Crash on exiting Editor after enabling Oculus Avatar plugin: UE4Editor-OculusEditor.dll!FOculusEditorModule::ShutdownModule()
Fixed! UE-102642 Oculus Quest startup failure on Vulkan
Fixed! UE-102626 Mobile-Multiview crash with 2D Scene Capture
Fixed! UE-102554 Water: Fix smoothing pass of Waterbody
Fixed! UE-102508 Remote Control API - WebInterface plugin, error at non-unity build

[virtualHC]

I think the skylight settings in raytracing has changed. When I migrate from 4.25 to 4.26, the skylight is behaving completely different, and isnt providing lighting im getting in 4.25 (which is better lighting with more shadows. Anyone know what could be going on? I would really like to migrate to 4.26 for my project to use its new features when its officially done, but the raytraced skylight lighting has become an essential component for my animation project. Hopefully this is fixed!

4.25 Lighting with raytraced skylight.(ideal result)


4.26 Lighting with raytraced skylight.(not ideal)


Also I have been using the RTX Raytracing easy global settings plugin to manage my raytraced settings.
https://www.unrealengine.com/marketp...ttings-tweaker

I just ran into the same issue also with 4.26. Suddenly my Skylight looked overblown and not occluded like in your screenshots (I have cast raytraced shadows on). I'm not sure what exactly fixed it but I remember that I tried a few things: I toggled the mobility a few times (set it to static then movable), I also unchecked and checked the new realtime capture setting and also pressed the Recapture button. One of those made it go back to normal.

[WhiteC0T]

Fixed! UE-102401 Chaos Vehicle Plugin not working in -Game mode

Is that meant for the source version of UE4 (given that as far as I know Chaos is disabled for the launcher version)? Also, upon the full 4.26 release, will it be possible to build source version with chaos as well?

[The_Distiller]

Enabling "crack free displacement" breaks the material in preview 7.

[MasterChief_UA]

in 4.26 Preview 7. Still exists a bug when if you disable Raytraced Shadow Denoiser (r.Shadow.Denoiser 0) all RectLight stop casting Raytraced shadow.

Proper behavior - RectLight continues to casting Raytraced shadow but Raytraced Shadow Denoiser is disabled.
This affects only RectLights and only with Shadow denoiser. Disabling other Denoisers (AO, Reflection, Diffuse GI, Skylight) doesn't produce this bug.

[InnervationBros]

I just ran into the same issue also with 4.26. Suddenly my Skylight looked overblown and not occluded like in your screenshots (I have cast raytraced shadows on). I'm not sure what exactly fixed it but I remember that I tried a few things: I toggled the mobility a few times (set it to static then movable), I also unchecked and checked the new realtime capture setting and also pressed the Recapture button. One of those made it go back to normal.

Thanks for the suggestion! Changing the mobility and recapturing the scene did not work for me however. Im noticing the skylight affect is much more subtle when doing that though. Its barrely affecting my environment. But my environment should actually be much darker in reality.

[Arkiras]

After updating to preview 7 I can't even open my projects created in preview 6. Crashes while compiling shaders before the editor even loads.

[hszhhh]

Crash when open gpulightmass plugin ,

[InnervationBros]

After updating to preview 7 I can't even open my projects created in preview 6. Crashes while compiling shaders before the editor even loads.

Im not even able to download Preview 7 yet. It still just says preview 6.

Update: Nevermind I just had to restart the epic games application. Also skylight still seems to be different in Preview 7.

[scha]

After updating to preview 7 I can't even open my projects created in preview 6. Crashes while compiling shaders before the editor even loads.

Same here. I disabled raytracing in defaultengine.ini then it works.

[InnervationBros]

Same here. I disabled raytracing in defaultengine.ini then it works.

Yeah im noticing that it could have something to do with displacement/tesselation. I havent experienced a crash yet, but all of my materials that use that feature are broken.

[Arkiras]

Same here. I disabled raytracing in defaultengine.ini then it works.

Thanks for pointing this out, can confirm. I started a new project, enabled GPU Lightmass and VT Lightmaps. Worked fine until I switched raytracing on then it started crashing.

sux

[Wir3d]

Ok in that case I'll just wait a bit before some more testing... but 4.26 excitement is real, can't wait for the final release.

[dpham]

Not sure when there will be a hotfix...so is there a way to rollback to preview 6? The crashes relating to gpulightmass and raytracing is a bummer .