# \#Path-Tracer **URL:** https://forums.unrealengine.com/tag/path-tracer/11340.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [Path Tracing Vdb problem](https://forums.unrealengine.com/t/path-tracing-vdb-problem/1769813)
**Author:** [@VlastelinSeksa](https://forums.unrealengine.com/u/VlastelinSeksa)\ **Replies:** 12\ **Last updated:** [August 21, 2026, 2:52am UTC](https://forums.unrealengine.com/t/path-tracing-vdb-problem/1769813 "2026-08-21T02:52:01Z")
Hi all. I have VDB fire imported from Embergen. And it doesn’t show up in Path Tracing. I know that I need to enter the command r.pathtracing.heterogeneous volumes 1 but after that nothing changes, the VDB is still not v… --- ## [Harmonia — a scene staging toolkit for UE 5.7/5.8 ](https://forums.unrealengine.com/t/harmonia-a-scene-staging-toolkit-for-ue-5-7-5-8/2744469)
**Author:** [@Sepia211](https://forums.unrealengine.com/u/Sepia211)\ **Replies:** 0\ **Last updated:** [August 17, 2026, 5:57pm UTC](https://forums.unrealengine.com/t/harmonia-a-scene-staging-toolkit-for-ue-5-7-5-8/2744469 "2026-08-17T17:57:13Z")
Hi everyone! I’m an archviz artist at an architecture firm, and I’ve been building the toolkit I always wanted inside Unreal. It’s called Harmonia. One lighting rig and twelve viewport tools for UE 5.7 and 5.8, built… --- ## [\[Unreal Engine 5.8\] Steam / smoke not appearing in Path tracing in ](https://forums.unrealengine.com/t/unreal-engine-5-8-steam-smoke-not-appearing-in-path-tracing-in/2742500)
**Author:** [@aadiacer12](https://forums.unrealengine.com/u/aadiacer12)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 10:40am UTC](https://forums.unrealengine.com/t/unreal-engine-5-8-steam-smoke-not-appearing-in-path-tracing-in/2742500 "2026-08-11T10:40:48Z")
When I render it in default unlit mode , the steams and smoke appears but when I try to render it in Path tracer, the steam just doesn’t appear, steam is an emitter object. Please help im beginner. The engine version is … --- ## [How to render Alpha Transparency in Path Tracer](https://forums.unrealengine.com/t/how-to-render-alpha-transparency-in-path-tracer/2163835)
**Author:** [@Grimgorkos1](https://forums.unrealengine.com/u/Grimgorkos1)\ **Replies:** 5\ **Last updated:** [June 26, 2026, 2:56pm UTC](https://forums.unrealengine.com/t/how-to-render-alpha-transparency-in-path-tracer/2163835 "2026-06-26T14:56:57Z")
Hi all, I am using 5.4 and am having trouble finding a way to render alpha transparency of glass. I am using the movie render graph to render a vehicle with a holdout on a shadow-catcher plane. In post we comp together … --- ## [Pathtracer and Niagara-Particles - since when do they work together? :)](https://forums.unrealengine.com/t/pathtracer-and-niagara-particles-since-when-do-they-work-together/569386)
**Author:** [@Suthriel](https://forums.unrealengine.com/u/Suthriel)\ **Replies:** 9\ **Last updated:** [June 17, 2026, 11:54pm UTC](https://forums.unrealengine.com/t/pathtracer-and-niagara-particles-since-when-do-they-work-together/569386 "2026-06-17T23:54:50Z")
Hey, not really a question, more like a nice surprise for me, because i didn´t know, that the Pathtracer (4.27, the UE 5.0 crashed permanently with this test) and Niagara Particles work together and can even illuminate … --- ## [Decouple Path TRacer preview from PT Render Settings](https://forums.unrealengine.com/t/decouple-path-tracer-preview-from-pt-render-settings/2721594)
**Author:** [@user-9f5b1](https://forums.unrealengine.com/u/user-9f5b1)\ **Replies:** 2\ **Last updated:** [June 4, 2026, 2:55pm UTC](https://forums.unrealengine.com/t/decouple-path-tracer-preview-from-pt-render-settings/2721594 "2026-06-04T14:55:27Z")
Hi dev team, Can we please get the change to change the path tracer render settings without having to have the path tracer preview on? I understand the rationale behind this UI choice, but it does not scale with complex… --- ## [Can you use Path Tracing on MetaHuman Grooms? If so, how?](https://forums.unrealengine.com/t/can-you-use-path-tracing-on-metahuman-grooms-if-so-how/2720854)
**Author:** [@MADMOVIESINC](https://forums.unrealengine.com/u/MADMOVIESINC)\ **Replies:** 0\ **Last updated:** [May 8, 2026, 1:31pm UTC](https://forums.unrealengine.com/t/can-you-use-path-tracing-on-metahuman-grooms-if-so-how/2720854 "2026-05-08T13:31:33Z")
Hello there! I’m trying to render a MetaHuman using Path Tracer in a 5.6 project. The hair is almost not visible at all though in the render. Below is a screenshot of the preview window and a frame that was rendered wit… --- ## [Unreal 5.5 Path Tracer GPU Dumps Abnormally](https://forums.unrealengine.com/t/unreal-5-5-path-tracer-gpu-dumps-abnormally/2694483)
**Author:** [@RB\_Brendan](https://forums.unrealengine.com/u/RB_Brendan)\ **Replies:** 2\ **Last updated:** [April 28, 2026, 5:52pm UTC](https://forums.unrealengine.com/t/unreal-5-5-path-tracer-gpu-dumps-abnormally/2694483 "2026-04-28T17:52:47Z")
I am running into a weird issue when trying to use the path tracer in my Unreal Engine project. What’s odd is that I’ve been able to use the path tracer in the past on this PC and I’m not sure what’s changed since the ti… --- ## [Light Visibility Through Glass Objects/Materials](https://forums.unrealengine.com/t/light-visibility-through-glass-objects-materials/866106)
**Author:** [@EvanHammel](https://forums.unrealengine.com/u/EvanHammel)\ **Replies:** 4\ **Last updated:** [April 20, 2026, 9:22am UTC](https://forums.unrealengine.com/t/light-visibility-through-glass-objects-materials/866106 "2026-04-20T09:22:44Z")
Hi there, I’m using 5.2 Preview 2 to test out what’s new in the world of UE Path Tracing. One thing I still don’t see is the ability to turn off light visibility in refractions. In the example here, I have a skylig… --- ## [Bug- Path Tracer depth pass is two frames off](https://forums.unrealengine.com/t/bug-path-tracer-depth-pass-is-two-frames-off/2710903)
**Author:** [@JakeCreate](https://forums.unrealengine.com/u/JakeCreate)\ **Replies:** 0\ **Last updated:** [April 2, 2026, 5:34am UTC](https://forums.unrealengine.com/t/bug-path-tracer-depth-pass-is-two-frames-off/2710903 "2026-04-02T05:34:07Z")
Title says it all. When I render out of path tracer and comp it in Nuke, I noticed weird ghosting artifacts like my depth pass wasn’t lining up with the beauty. Sure enough, I had to offset the depth pass by two frames, … --- ## [Twinmotion freeze when turning on path tracing ](https://forums.unrealengine.com/t/twinmotion-freeze-when-turning-on-path-tracing/2708927)
**Author:** [@TOMIGENTA](https://forums.unrealengine.com/u/TOMIGENTA)\ **Replies:** 0\ **Last updated:** [March 25, 2026, 5:52pm UTC](https://forums.unrealengine.com/t/twinmotion-freeze-when-turning-on-path-tracing/2708927 "2026-03-25T17:52:46Z")
when i turn on pathtracing on a new project, it freezes the twinmotion tab, so i need to force the program to end. Any idea of how to fix this? The PC specs are not the issue because on the lower left it sys 29% before t… --- ## [What's (if there is one) the forecast for path tracer on mac?](https://forums.unrealengine.com/t/whats-if-there-is-one-the-forecast-for-path-tracer-on-mac/2703742)
**Author:** [@laurin2cool](https://forums.unrealengine.com/u/laurin2cool)\ **Replies:** 0\ **Last updated:** [March 4, 2026, 10:43pm UTC](https://forums.unrealengine.com/t/whats-if-there-is-one-the-forecast-for-path-tracer-on-mac/2703742 "2026-03-04T22:43:23Z")
Dear Developers, I have to Invest into a new computer due to work and I’d really like to get a mac. The only problem I have that I use twinmotion for architectural renderings, and since the path tracer option is almost … --- ## [UE 5.7 Pathtracer Fatal error in large scenes](https://forums.unrealengine.com/t/ue-5-7-pathtracer-fatal-error-in-large-scenes/2678561)
**Author:** [@SinnPhilipp](https://forums.unrealengine.com/u/SinnPhilipp)\ **Replies:** 6\ **Last updated:** [February 16, 2026, 2:39pm UTC](https://forums.unrealengine.com/t/ue-5-7-pathtracer-fatal-error-in-large-scenes/2678561 "2026-02-16T14:39:24Z")
Hello, after upgrading a project from 5.5 to 5.7, I get the following crash in Pathtracer: Fatal error: \[File:D:\\build\\++UE5\\Sync\\Engine\\Source\\Runtime\\D3D12RHI\\Private\\D3D12Util.cpp\] \[Line: 1030\] Adapter-\>CreateComm… --- ## [Path Tracer not rendering emissive fog](https://forums.unrealengine.com/t/path-tracer-not-rendering-emissive-fog/2696777)
**Author:** [@otabek\_eg](https://forums.unrealengine.com/u/otabek_eg)\ **Replies:** 0\ **Last updated:** [February 3, 2026, 8:20am UTC](https://forums.unrealengine.com/t/path-tracer-not-rendering-emissive-fog/2696777 "2026-02-03T08:20:47Z")
I have a scene where ExponentialHeightFog is added, volumetric fog and Emissive is also enabled. Everything works fine with Lumen but when I turn on the Path Tracer, the scene gets dark because fog emissive doesnt seem t… --- ## [Path trace sale como desactivado en Twinmotion ](https://forums.unrealengine.com/t/path-trace-sale-como-desactivado-en-twinmotion/2678995)
**Author:** [@Cemosa\_inf](https://forums.unrealengine.com/u/Cemosa_inf)\ **Replies:** 0\ **Last updated:** [November 26, 2025, 3:13pm UTC](https://forums.unrealengine.com/t/path-trace-sale-como-desactivado-en-twinmotion/2678995 "2025-11-26T15:13:57Z")
La opción de renderizado de Path Trace dentro de Twinmotion sale como deshabilitada. Me dice que el equipo no es compatible pero no es cierto, ya que tiene doble gráfica en SLI NVIDIA A2000 de 12 GB cada una de ellas. El… --- ## [how to fix inconsistency lights and colors between pathtracer viewport and render ](https://forums.unrealengine.com/t/how-to-fix-inconsistency-lights-and-colors-between-pathtracer-viewport-and-render/2677912)
**Author:** [@hydrooise](https://forums.unrealengine.com/u/hydrooise)\ **Replies:** 0\ **Last updated:** [November 23, 2025, 10:02pm UTC](https://forums.unrealengine.com/t/how-to-fix-inconsistency-lights-and-colors-between-pathtracer-viewport-and-render/2677912 "2025-11-23T22:02:30Z")
hello, i found myself stuck in incosistent lighting and colors, as tou can see from the images the viewport has brighter highlights than the exr render. for more info: i have a post process with manual exposure settings… --- ## [Does Path Tracer support renders with Burn In?](https://forums.unrealengine.com/t/does-path-tracer-support-renders-with-burn-in/642189)
**Author:** [@SupremeOrder](https://forums.unrealengine.com/u/SupremeOrder)\ **Replies:** 2\ **Last updated:** [November 12, 2025, 3:53pm UTC](https://forums.unrealengine.com/t/does-path-tracer-support-renders-with-burn-in/642189 "2025-11-12T15:53:20Z")
The Burn-In works fine when using Deferred Rendering, but it does not show when rendering with Path Tracer (UE 5.0.3). The Movie Pipeline Burn-In is really important for development and staging phases. --- ## [Overexposed caustics or light refraction with Path Tracing](https://forums.unrealengine.com/t/overexposed-caustics-or-light-refraction-with-path-tracing/2673267)
**Author:** [@Creo](https://forums.unrealengine.com/u/Creo)\ **Replies:** 0\ **Last updated:** [November 9, 2025, 4:26pm UTC](https://forums.unrealengine.com/t/overexposed-caustics-or-light-refraction-with-path-tracing/2673267 "2025-11-09T16:26:47Z")
Hi, While using Path Tracer and glass materials I’ve faced with overexposed (or over brightened) caustics from glass. First of all, to create glass materials I used official documentation Here is two room renders with… --- ## [Material Displacement with Pathtracer (Not modelling displacement!)](https://forums.unrealengine.com/t/material-displacement-with-pathtracer-not-modelling-displacement/1692596)
**Author:** [@StrataHomes](https://forums.unrealengine.com/u/StrataHomes)\ **Replies:** 3\ **Last updated:** [October 3, 2025, 7:54am UTC](https://forums.unrealengine.com/t/material-displacement-with-pathtracer-not-modelling-displacement/1692596 "2025-10-03T07:54:05Z")
Hi, I am trying to achieve a material which can displace geometry for static renders (I’m not bothered by performance) I’ve been looking on many forums / YouTube for this answer, and I think the answer is a ‘no’ but I wa… --- ## [Problem with coloured spots and wavy edges in Path tracer](https://forums.unrealengine.com/t/problem-with-coloured-spots-and-wavy-edges-in-path-tracer/2661178)
**Author:** [@pola.k](https://forums.unrealengine.com/u/pola.k)\ **Replies:** 1\ **Last updated:** [October 1, 2025, 9:39pm UTC](https://forums.unrealengine.com/t/problem-with-coloured-spots-and-wavy-edges-in-path-tracer/2661178 "2025-10-01T21:39:34Z")
Hello everyone :slightly\_smiling\_face: , I encountered a problem while rendering in Twinmotion. During rendering in Path Tracer mode, I see colored spots on the screen that are visible in the visualizations. The image i… --- ## [Some materials not showing in Path Tracer renders (Twinmotion 2025.1.1) ](https://forums.unrealengine.com/t/some-materials-not-showing-in-path-tracer-renders-twinmotion-2025-1-1/2660157)
**Author:** [@pola.k](https://forums.unrealengine.com/u/pola.k)\ **Replies:** 1\ **Last updated:** [October 1, 2025, 10:11am UTC](https://forums.unrealengine.com/t/some-materials-not-showing-in-path-tracer-renders-twinmotion-2025-1-1/2660157 "2025-10-01T10:11:18Z")
Hello, I have added a few different materials to my model and all of them are visible in Real time render mode - both in Standard and Lumen, as well as in the small windows with saved scenes in Media mode. However my ai… --- ## [Path Tracer looks much better in viewport vs exported image](https://forums.unrealengine.com/t/path-tracer-looks-much-better-in-viewport-vs-exported-image/2653511)
**Author:** [@RB\_Brendan](https://forums.unrealengine.com/u/RB_Brendan)\ **Replies:** 1\ **Last updated:** [September 12, 2025, 6:05pm UTC](https://forums.unrealengine.com/t/path-tracer-looks-much-better-in-viewport-vs-exported-image/2653511 "2025-09-12T18:05:46Z")
I have been noticing that my Path Tracing views look much better in the viewport than what is being exported from the MRQ. Has anyone else experienced this and might understand what I need to do? I can’t use the High Res… --- ## [Kind of silly question](https://forums.unrealengine.com/t/kind-of-silly-question/2600524)
**Author:** [@madvisual.sk](https://forums.unrealengine.com/u/madvisual.sk)\ **Replies:** 2\ **Last updated:** [August 21, 2025, 2:10pm UTC](https://forums.unrealengine.com/t/kind-of-silly-question/2600524 "2025-08-21T14:10:13Z")
Hello everyone, I am trying to solve issue with UE addon which’s support keeps sending me here. Issue is with Chaos Anima 4D characters not rendering in path-tracer. Clearly this is issue with the addon itself but just… --- ## [Monitoring Real-Time Path Tracer Progress and Retrieving Progress Bar Status in Unreal Engine](https://forums.unrealengine.com/t/monitoring-real-time-path-tracer-progress-and-retrieving-progress-bar-status-in-unreal-engine/1208281)
**Author:** [@Netzwerk3D](https://forums.unrealengine.com/u/Netzwerk3D)\ **Replies:** 6\ **Last updated:** [July 30, 2025, 1:35am UTC](https://forums.unrealengine.com/t/monitoring-real-time-path-tracer-progress-and-retrieving-progress-bar-status-in-unreal-engine/1208281 "2025-07-30T01:35:56Z")
Hello fellow developers, I’m currently working on a project where I enable the path tracer at runtime using the command “ShowFlag.PathTracing 1”. While the path tracer is running, there is a progress bar displayed at th… --- ## [Rendering pivot painter wind WPO foliage in Path Traced vs. Deferred](https://forums.unrealengine.com/t/rendering-pivot-painter-wind-wpo-foliage-in-path-traced-vs-deferred/2619806)
**Author:** [@Kidt](https://forums.unrealengine.com/u/Kidt)\ **Replies:** 0\ **Last updated:** [July 27, 2025, 7:50am UTC](https://forums.unrealengine.com/t/rendering-pivot-painter-wind-wpo-foliage-in-path-traced-vs-deferred/2619806 "2025-07-27T07:50:13Z")
Guys, do you have any idea or insight, why my PivotPainter Foliage Instances behave so weirdly when rendered in PT - looks a bit like they are shaking in unison instead of organically!? Important: Renders complete… --- ## [EXTERIOR RENDER](https://forums.unrealengine.com/t/exterior-render/2585481)
**Author:** [@mazahar1093](https://forums.unrealengine.com/u/mazahar1093)\ **Replies:** 0\ **Last updated:** [June 30, 2025, 2:49pm UTC](https://forums.unrealengine.com/t/exterior-render/2585481 "2025-06-30T14:49:18Z")
My first exterior render with my upgraded setup. Thank you @nrTCf1517 for your tutorial. --- ## [Underwater](https://forums.unrealengine.com/t/underwater/2542799)
**Author:** [@gugroppo](https://forums.unrealengine.com/u/gugroppo)\ **Replies:** 6\ **Last updated:** [June 16, 2025, 4:36pm UTC](https://forums.unrealengine.com/t/underwater/2542799 "2025-06-16T16:36:43Z")
Hello! This is a fish I created aiming to test UE Path Tracing render. I’m amazed with the results and the possibility to create powerful materials. The fish model is based on many references I gathered for both silhou… --- ## [HDRI reflections don't work with SkyAtmosphere (Path Tracer) ](https://forums.unrealengine.com/t/hdri-reflections-dont-work-with-skyatmosphere-path-tracer/2548831)
**Author:** [@Zerosh1](https://forums.unrealengine.com/u/Zerosh1)\ **Replies:** 1\ **Last updated:** [June 10, 2025, 6:24am UTC](https://forums.unrealengine.com/t/hdri-reflections-dont-work-with-skyatmosphere-path-tracer/2548831 "2025-06-10T06:24:21Z")
Hi everyone, I’m a new visual artist learning the program. My problem is that in my scene, when I use SkyAtmosphere, the HDRI isn’t showing in the reflections. When I turn it off, they’re still showing, but I lose the S… --- ## [Path Tracer Get Darker Then Lumen](https://forums.unrealengine.com/t/path-tracer-get-darker-then-lumen/2546622)
**Author:** [@kurd\_rehz](https://forums.unrealengine.com/u/kurd_rehz)\ **Replies:** 1\ **Last updated:** [June 8, 2025, 10:15am UTC](https://forums.unrealengine.com/t/path-tracer-get-darker-then-lumen/2546622 "2025-06-08T10:15:12Z")
"Rendering with Path Tracer results in a slightly darker image compared to Lumen as you can see in both images which the one that is in this topic is brighter Which its with lumen and other one which i will put in co… --- ## [Skeletal Mesh is not rendering in Path Tracing UE 5.0.2. WHY?](https://forums.unrealengine.com/t/skeletal-mesh-is-not-rendering-in-path-tracing-ue-5-0-2-why/667556)
**Author:** [@Postprocessed](https://forums.unrealengine.com/u/Postprocessed)\ **Replies:** 12\ **Last updated:** [June 1, 2025, 6:39pm UTC](https://forums.unrealengine.com/t/skeletal-mesh-is-not-rendering-in-path-tracing-ue-5-0-2-why/667556 "2025-06-01T18:39:25Z")
Hello Everyone! After carefully browsing forums, doing google search and trying to troubleshoot basic\\obvious issues I am still not able to find the answer. To be hones I am pretty surprised nobody had same issue and I … [Next page](https://forums.unrealengine.com/tag/path-tracer/11340.md?match_all_tags=true&page=1&tags%5B%5D=Path-Tracer)