# \#directx **URL:** https://forums.unrealengine.com/tag/directx/2655.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [UE5.7 - Fix: Lumen not working for SM5 DX11 and DX12](https://forums.unrealengine.com/t/ue5-7-fix-lumen-not-working-for-sm5-dx11-and-dx12/2676047)
**Author:** [@Uno1982](https://forums.unrealengine.com/u/Uno1982)\ **Replies:** 4\ **Last updated:** [September 4, 2026, 4:24pm UTC](https://forums.unrealengine.com/t/ue5-7-fix-lumen-not-working-for-sm5-dx11-and-dx12/2676047 "2026-09-04T16:24:22Z")
When using the cvar r.Lumen.Supported.SM5=1 which was working fine in 5.6 … UE5.7 presents with the following in DX11 and DX12 SM5 https://github.com/uno1982/UnrealEngine/tree/5.7-Lumen-D3D-SM5-Fix Fix: Restore Lume… --- ## [nDisplay Nvidia Sync: SetMaximumLatency returns an error, missing Swaptchain flag DXGI\_SWAP\_CHAIN\_FLAG\_FRAME\_LATENCY\_WAITABLE\_OBJECT](https://forums.unrealengine.com/t/ndisplay-nvidia-sync-setmaximumlatency-returns-an-error-missing-swaptchain-flag-dxgi-swap-chain-flag-frame-latency-waitable-object/2746333)
**Author:** [@David\_Gilbert](https://forums.unrealengine.com/u/David_Gilbert)\ **Replies:** 0\ **Last updated:** [August 25, 2026, 12:38pm UTC](https://forums.unrealengine.com/t/ndisplay-nvidia-sync-setmaximumlatency-returns-an-error-missing-swaptchain-flag-dxgi-swap-chain-flag-frame-latency-waitable-object/2746333 "2026-08-25T12:38:39Z")
Summary When running nDisplay with the Nvidia Sync Policy (Swap/Present barrier), the engine throws an error when trying to call SetMaximumFrameLatency (e.g. in this line) There is a further comment on the nDisplay.sync… --- ## [UI Glitch in Unreal Engine 5.8.1 with DirectX12 on Intel Arc A380 ](https://forums.unrealengine.com/t/ui-glitch-in-unreal-engine-5-8-1-with-directx12-on-intel-arc-a380/2743847)
**Author:** [@Arnab\_Sarker](https://forums.unrealengine.com/u/Arnab_Sarker)\ **Replies:** 0\ **Last updated:** [August 14, 2026, 4:12pm UTC](https://forums.unrealengine.com/t/ui-glitch-in-unreal-engine-5-8-1-with-directx12-on-intel-arc-a380/2743847 "2026-08-14T16:12:50Z")
Subject: High-Priority UI Rendering Bug: Persistent Slate Submenu Corruptions & Artifacts (Screen Static Patterns) on Intel Arc Architecture Engine Version: Unreal Engine 5.8.1 Operating System: Windows 11 (64-bit) … --- ## [DirectX12 GPU related Crash](https://forums.unrealengine.com/t/directx12-gpu-related-crash/2386830)
**Author:** [@unit23](https://forums.unrealengine.com/u/unit23)\ **Replies:** 6\ **Last updated:** [January 31, 2026, 4:10pm UTC](https://forums.unrealengine.com/t/directx12-gpu-related-crash/2386830 "2026-01-31T16:10:45Z")
With 5.5.4 and using a AMD GPU - when opening a DataTable and moving the Editor window the following error and crash happens Assertion failed: TryAllocateInternal(InSize, AllocationAlignment, AllocationResourceType, Al… --- ## [UE 5.7 Preview -\> DX12 Broken on AMD 7900XT Driver 25.10.12 Released 10/13/2025](https://forums.unrealengine.com/t/ue-5-7-preview-dx12-broken-on-amd-7900xt-driver-25-10-12-released-10-13-2025/2670872)
**Author:** [@LoweloDev](https://forums.unrealengine.com/u/LoweloDev)\ **Replies:** 9\ **Last updated:** [January 22, 2026, 7:25pm UTC](https://forums.unrealengine.com/t/ue-5-7-preview-dx12-broken-on-amd-7900xt-driver-25-10-12-released-10-13-2025/2670872 "2026-01-22T19:25:26Z")
Hello again, just an hour later. Next issue, just asking around here if anyone else came across the issues / had a workaround before I make a Bug report. Updated to 5.7 as I heard Chaos Caching issues mostly disappeare… --- ## [DX 12 is not supported on your system](https://forums.unrealengine.com/t/dx-12-is-not-supported-on-your-system/765833)
**Author:** [@D1mon4ella](https://forums.unrealengine.com/u/D1mon4ella)\ **Replies:** 42\ **Last updated:** [January 4, 2026, 7:35pm UTC](https://forums.unrealengine.com/t/dx-12-is-not-supported-on-your-system/765833 "2026-01-04T19:35:41Z")
Hello, I installed UE 5.1 and it gives me this error What can I do in order to fix it? I have rtx 3060 with latest drivers, windows 10 version 1909, 32 gb ram --- ## [DirectX 12 And unreal engine crashing my games.](https://forums.unrealengine.com/t/directx-12-and-unreal-engine-crashing-my-games/2643059)
**Author:** [@Von-Hayek](https://forums.unrealengine.com/u/Von-Hayek)\ **Replies:** 0\ **Last updated:** [August 15, 2025, 5:28pm UTC](https://forums.unrealengine.com/t/directx-12-and-unreal-engine-crashing-my-games/2643059 "2025-08-15T17:28:28Z")
Hi, I recently bought Mafia the old country and i cant play it because the game crashes, like all my other unreal engine games. The only exception being The Finals because i could force launch on DirectX11 and then it wo… --- ## [Knowing which RHI has been used in a project from the code?](https://forums.unrealengine.com/t/knowing-which-rhi-has-been-used-in-a-project-from-the-code/455808)
**Author:** [@Kakushi\_52](https://forums.unrealengine.com/u/Kakushi_52)\ **Replies:** 3\ **Last updated:** [July 29, 2025, 12:04am UTC](https://forums.unrealengine.com/t/knowing-which-rhi-has-been-used-in-a-project-from-the-code/455808 "2025-07-29T00:04:38Z")
Is there any way which RHI has been used in a project from the code? I’d like to handle DirectX directly so I’d like to know especially which of the DirectX (11 or 12) has been used in the project from the code. I wond… --- ## [twinmotion doesn´t recognize directx12](https://forums.unrealengine.com/t/twinmotion-doesn-t-recognize-directx12/2407862)
**Author:** [@mjcduarte](https://forums.unrealengine.com/u/mjcduarte)\ **Replies:** 4\ **Last updated:** [May 5, 2025, 3:03pm UTC](https://forums.unrealengine.com/t/twinmotion-doesn-t-recognize-directx12/2407862 "2025-05-05T15:03:55Z")
I have a system with directx12, ihave direct x12 selected on my preferences in Twinmotion but i can´t turn on path tracer once i get the message to select directx12 on the preferences panel. (?) Message in portuguese. … --- ## [Epic Games Launcher not downloading 64 bit version](https://forums.unrealengine.com/t/epic-games-launcher-not-downloading-64-bit-version/433490)
**Author:** [@anonymous\_user\_181dff9b](https://forums.unrealengine.com/u/anonymous_user_181dff9b)\ **Replies:** 10\ **Last updated:** [April 27, 2025, 5:36pm UTC](https://forums.unrealengine.com/t/epic-games-launcher-not-downloading-64-bit-version/433490 "2025-04-27T17:36:11Z")
Experienced computer user. Spent most of last night researching this issue and running DWalker, reinstalling VCredist,etc. I believe I have read almost every post out there on this subject but just not getting anywhere.… --- ## [Ray tracing won't enable, says RHI isn't supported but using DX12](https://forums.unrealengine.com/t/ray-tracing-wont-enable-says-rhi-isnt-supported-but-using-dx12/487639)
**Author:** [@sleepykid](https://forums.unrealengine.com/u/sleepykid)\ **Replies:** 2\ **Last updated:** [November 20, 2024, 8:10am UTC](https://forums.unrealengine.com/t/ray-tracing-wont-enable-says-rhi-isnt-supported-but-using-dx12/487639 "2024-11-20T08:10:24Z")
From the logs: LogRendererCore: Ray tracing is disabled. Reason: not supported by current RHI. Cmd: r.RHI.Name Running on the D3D12 RHI Have an RTX 3090 GPU on latest graphics drivers Latest windows version Not sur… --- ## [How do I GetD3DRHI() in my project without invasively editing engine source code?](https://forums.unrealengine.com/t/how-do-i-getd3drhi-in-my-project-without-invasively-editing-engine-source-code/2017495)
**Author:** [@mcraze](https://forums.unrealengine.com/u/mcraze)\ **Replies:** 0\ **Last updated:** [September 12, 2024, 10:10am UTC](https://forums.unrealengine.com/t/how-do-i-getd3drhi-in-my-project-without-invasively-editing-engine-source-code/2017495 "2024-09-12T10:10:46Z")
Hey. I need to basically get the FD3D12DynamicRHI struct with all its cool things, however when trying to include headers for this I run into issues like other headers “missing”, even though they definitely aren’t. Now … --- ## [How to get info about which GPU and CPU player has in C++?](https://forums.unrealengine.com/t/how-to-get-info-about-which-gpu-and-cpu-player-has-in-c/1989661)
**Author:** [@Player\_003](https://forums.unrealengine.com/u/Player_003)\ **Replies:** 1\ **Last updated:** [August 24, 2024, 8:25am UTC](https://forums.unrealengine.com/t/how-to-get-info-about-which-gpu-and-cpu-player-has-in-c/1989661 "2024-08-24T08:25:40Z")
I want to make plugin that gets me info about which CPU player is using and GPU (Including how much VRAM it has), but im not sure how would i get info about that in C++ --- ## [Problems after changing from directx11 to directx12 in VR](https://forums.unrealengine.com/t/problems-after-changing-from-directx11-to-directx12-in-vr/1860874)
**Author:** [@Ilina\_Bokareva](https://forums.unrealengine.com/u/Ilina_Bokareva)\ **Replies:** 0\ **Last updated:** [May 17, 2024, 6:40pm UTC](https://forums.unrealengine.com/t/problems-after-changing-from-directx11-to-directx12-in-vr/1860874 "2024-05-17T18:40:16Z")
Hi, I have project for VR with scans. Originally it was in directx 12 and it worked fine but I was asked to build it for directx 11. It had awful shading and I tried to change it back but scene with scans became blue and… --- ## [Does Unreal Engine automatically switch between DirectX 12 and DirectX 11 for users without DX12 support?](https://forums.unrealengine.com/t/does-unreal-engine-automatically-switch-between-directx-12-and-directx-11-for-users-without-dx12-support/1852682)
**Author:** [@FeLucas](https://forums.unrealengine.com/u/FeLucas)\ **Replies:** 1\ **Last updated:** [May 13, 2024, 5:44pm UTC](https://forums.unrealengine.com/t/does-unreal-engine-automatically-switch-between-directx-12-and-directx-11-for-users-without-dx12-support/1852682 "2024-05-13T17:44:09Z")
I’m releasing my first game and I have a concern. If I set my default RHI to DirectX 12 in my project settings, will users without DirectX 12 support automatically use DirectX 11 instead? If not, how can I add DX11 sup… --- ## [DirectX 12 with the SM6 shader format not support in win11](https://forums.unrealengine.com/t/directx-12-with-the-sm6-shader-format-not-support-in-win11/1824593)
**Author:** [@zerox1336](https://forums.unrealengine.com/u/zerox1336)\ **Replies:** 3\ **Last updated:** [May 1, 2024, 12:45pm UTC](https://forums.unrealengine.com/t/directx-12-with-the-sm6-shader-format-not-support-in-win11/1824593 "2024-05-01T12:45:04Z")
Hi, folks, I have the following error message popping up in my engine 5.3.2 : Missing support for advanced rendering features This project attempted to launch DirectX 12 with the SM6 shader format but it is not suppor… --- ## [FIXED! Gpu crash/d3d device removed error](https://forums.unrealengine.com/t/fixed-gpu-crash-d3d-device-removed-error/1818818)
**Author:** [@helden](https://forums.unrealengine.com/u/helden)\ **Replies:** 0\ **Last updated:** [April 24, 2024, 10:22am UTC](https://forums.unrealengine.com/t/fixed-gpu-crash-d3d-device-removed-error/1818818 "2024-04-24T10:22:59Z")
Hi everyone, just wanted to share a solution for D3D Device Removed Error that worked for me after I tried every other solution available on forums. The error was so random that it seemed there is no specific reason for … --- ## [Why does the WindowsServer build of UE4 require DirectX?](https://forums.unrealengine.com/t/why-does-the-windowsserver-build-of-ue4-require-directx/463862)
**Author:** [@StuntThumper88](https://forums.unrealengine.com/u/StuntThumper88)\ **Replies:** 1\ **Last updated:** [April 20, 2024, 3:06am UTC](https://forums.unrealengine.com/t/why-does-the-windowsserver-build-of-ue4-require-directx/463862 "2024-04-20T03:06:18Z")
Why does the WindowsServer build of UE4 require DirectX? Its preventing me from hosting on Windows Server Core edition. Isn’t that just for graphics card stuff? --- ## [VR in 2023.2.2 with DirectX 12 does not work properly](https://forums.unrealengine.com/t/vr-in-2023-2-2-with-directx-12-does-not-work-properly/1751768)
**Author:** [@GfG\_Koralewski](https://forums.unrealengine.com/u/GfG_Koralewski)\ **Replies:** 3\ **Last updated:** [April 15, 2024, 1:09pm UTC](https://forums.unrealengine.com/t/vr-in-2023-2-2-with-directx-12-does-not-work-properly/1751768 "2024-04-15T13:09:27Z")
Hello everyone, since the new Twinmotion version 2023.2.2 the VR mode no longer works properly with DirectX 12. In the VR glasses, only the left image is displayed correctly - on the right eye however you see a white ar… --- ## [Need help with HLSL (ps\_3\_0) d3d9 bug (discard vs return)](https://forums.unrealengine.com/t/need-help-with-hlsl-ps-3-0-d3d9-bug-discard-vs-return/1771791)
**Author:** [@Corriscant](https://forums.unrealengine.com/u/Corriscant)\ **Replies:** 0\ **Last updated:** [March 25, 2024, 5:17pm UTC](https://forums.unrealengine.com/t/need-help-with-hlsl-ps-3-0-d3d9-bug-discard-vs-return/1771791 "2024-03-25T17:17:32Z")
Hi, I need help with understanding what is wrong with my hlsl shader (ps\_3\_0 for d3d9). Here is part of my shader. It makes color part middle of the quad in GREEN. Make outside of sides of the “ships” RED. Make spac… --- ## [How can I resolve the error stating that XINPUT1\_4.dll is missing?](https://forums.unrealengine.com/t/how-can-i-resolve-the-error-stating-that-xinput1-4-dll-is-missing/283381)
**Author:** [@Dannthr](https://forums.unrealengine.com/u/Dannthr)\ **Replies:** 14\ **Last updated:** [January 23, 2024, 3:42pm UTC](https://forums.unrealengine.com/t/how-can-i-resolve-the-error-stating-that-xinput1-4-dll-is-missing/283381 "2024-01-23T15:42:44Z")
Hey folks, I’m trying my first build of UE4.1 and after a successful build in Visual Studio Express 2013 (On Win 7 Pro x64), I get this curious message: Installing Visual Studio distributables didn’t seem to do the tr… --- ## [Physical Sensor Simulation](https://forums.unrealengine.com/t/physical-sensor-simulation/1500062)
**Author:** [@Nick24\_3](https://forums.unrealengine.com/u/Nick24_3)\ **Replies:** 0\ **Last updated:** [December 7, 2023, 12:55am UTC](https://forums.unrealengine.com/t/physical-sensor-simulation/1500062 "2023-12-07T00:55:33Z")
Hi. I have a little knowledge about raytracing, which can be done well with rasterization. I want to build a physical lidar sensor that supports a ray-tracing system inside as an Actor. Are there any resources I could … --- ## [pakaged builds for UE 4.26 crash when creating instance static mesh when using vulkan](https://forums.unrealengine.com/t/pakaged-builds-for-ue-4-26-crash-when-creating-instance-static-mesh-when-using-vulkan/475390)
**Author:** [@TuxTheAstronaut](https://forums.unrealengine.com/u/TuxTheAstronaut)\ **Replies:** 3\ **Last updated:** [August 21, 2023, 12:53pm UTC](https://forums.unrealengine.com/t/pakaged-builds-for-ue-4-26-crash-when-creating-instance-static-mesh-when-using-vulkan/475390 "2023-08-21T12:53:19Z")
in UE 4.26 when i package my game for windows using any RHI other than DX12 it crashes as soon as i create an instance static mesh in the scene why is this happening and if it only works on DX 12 will that mean Linux bui… --- ## [How do I change the project back to DirectX12 from Vulkan without have Vulkan ?](https://forums.unrealengine.com/t/how-do-i-change-the-project-back-to-directx12-from-vulkan-without-have-vulkan/1169230)
**Author:** [@LilyLai98](https://forums.unrealengine.com/u/LilyLai98)\ **Replies:** 2\ **Last updated:** [May 22, 2023, 12:31pm UTC](https://forums.unrealengine.com/t/how-do-i-change-the-project-back-to-directx12-from-vulkan-without-have-vulkan/1169230 "2023-05-22T12:31:04Z")
Hello everyone, I am new to UE5 and I am working on my first project. My PC crashed multiple times with DirectX12 so I tried the methods I found online by switching to Vulkan and DirectX11. However, After I switch to Vu… --- ## [Redistributables for Steam](https://forums.unrealengine.com/t/redistributables-for-steam/433463)
**Author:** [@tongucci](https://forums.unrealengine.com/u/tongucci)\ **Replies:** 8\ **Last updated:** [May 11, 2023, 8:26pm UTC](https://forums.unrealengine.com/t/redistributables-for-steam/433463 "2023-05-11T20:26:39Z")
When I put my game (Say a first person desktop project) on Steam, from Steam’s redistributables page which ones do I have to check, if any? Is DirectX or .NET or Visual C++ mandatory, and if so, which ones? --- ## [UE5 - Build Reflection Capture is wrong when using DX12](https://forums.unrealengine.com/t/ue5-build-reflection-capture-is-wrong-when-using-dx12/729480)
**Author:** [@Loux\_xavier](https://forums.unrealengine.com/u/Loux_xavier)\ **Replies:** 2\ **Last updated:** [March 4, 2023, 7:26pm UTC](https://forums.unrealengine.com/t/ue5-build-reflection-capture-is-wrong-when-using-dx12/729480 "2023-03-04T19:26:15Z")
Hello since UE5 Build Reflection Capture do wrong captures when using DX12 in editor. Direct X 11 Direct X 12 As you can see it a way too bright with DX12. It seems that the rendering of pre-calculated shadow… --- ## [Crash when playing in VR with DirectX12 enabled](https://forums.unrealengine.com/t/crash-when-playing-in-vr-with-directx12-enabled/773216)
**Author:** [@ZaneJensen013](https://forums.unrealengine.com/u/ZaneJensen013)\ **Replies:** 0\ **Last updated:** [February 17, 2023, 11:19pm UTC](https://forums.unrealengine.com/t/crash-when-playing-in-vr-with-directx12-enabled/773216 "2023-02-17T23:19:17Z")
I am working on upgrading a VR project to use Nanite, and when I enabled set the default RHI to DirectX 12. The project crashes and I’m left with a black window, I’m then forced to force close the project. Any ideas on w… --- ## [D3D device being lost constantly](https://forums.unrealengine.com/t/d3d-device-being-lost-constantly/386374)
**Author:** [@Loux\_xavier](https://forums.unrealengine.com/u/Loux_xavier)\ **Replies:** 7\ **Last updated:** [May 22, 2022, 4:55pm UTC](https://forums.unrealengine.com/t/d3d-device-being-lost-constantly/386374 "2022-05-22T16:55:52Z")
Hello, since the 4.15 When I pass the mouse over the preview boxes (mesh, material, etc) or In open a AnimBP the engine crash "D3D device being lost " Crash logs I do not understand where the problem comes from, sometim… --- ## [How can you change the RHI as an in game setting](https://forums.unrealengine.com/t/how-can-you-change-the-rhi-as-an-in-game-setting/489931)
**Author:** [@vster](https://forums.unrealengine.com/u/vster)\ **Replies:** 4\ **Last updated:** [April 8, 2022, 2:37am UTC](https://forums.unrealengine.com/t/how-can-you-change-the-rhi-as-an-in-game-setting/489931 "2022-04-08T02:37:57Z")
Hi, I was wondering how I could make it to where you can choose to either use DirectX 11 or 12 as a setting in game. I can’t find anything on that anywhere. --- ## [How to prevent the DXGI\_ERROR\_DEVICE\_REMOVED error from the graphics driver from terminating the game?](https://forums.unrealengine.com/t/how-to-prevent-the-dxgi_error_device_removed-error-from-the-graphics-driver-from-terminating-the-game/459846)
**Author:** [@semi.essessi](https://forums.unrealengine.com/u/semi.essessi)\ **Replies:** 1\ **Last updated:** [March 9, 2022, 9:14am UTC](https://forums.unrealengine.com/t/how-to-prevent-the-dxgi_error_device_removed-error-from-the-graphics-driver-from-terminating-the-game/459846 "2022-03-09T09:14:28Z")
I’m wondering if there are any known workarounds to prevent the crashes and the game terminating due to the ‘removed device’ directx error code being received during a rendering operation? This looks like it exits harsh… [Next page](https://forums.unrealengine.com/tag/directx/2655.md?match_all_tags=true&page=1&tags%5B%5D=directx)