# Rendering **URL:** https://forums.unrealengine.com/c/development-discussion/rendering/36.md?page=99 [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) **Page:** 100 --- ## [Grass 'flashing' in EXR Path Trace render + in Lumen too ](https://forums.unrealengine.com/t/grass-flashing-in-exr-path-trace-render-in-lumen-too/2650031)
**Author:** [@kdgreenyer](https://forums.unrealengine.com/u/kdgreenyer)\ **Replies:** 0\ **Last updated:** [August 22, 2025, 1:33pm UTC](https://forums.unrealengine.com/t/grass-flashing-in-exr-path-trace-render-in-lumen-too/2650031 "2025-08-22T13:33:39Z")
Hello! I am trying to render out a short camera sequence for a project, and have tried both Path Tracing and Lumen but seem to be getting the same issue every time. Everything else in the scene renders fine, the quality… --- ## [FMaterialRenderProxy::UpdateDeferredCachedUniformExpressions Crash, Android ](https://forums.unrealengine.com/t/fmaterialrenderproxy-updatedeferredcacheduniformexpressions-crash-android/2658583)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 6\ **Last updated:** [August 22, 2025, 1:22pm UTC](https://forums.unrealengine.com/t/fmaterialrenderproxy-updatedeferredcacheduniformexpressions-crash-android/2658583 "2025-08-22T13:22:02Z")
Hi! We’ve encountered another render-related crash on all Android devices besides the one I’ve reported recently here: \[Content removed\] libUnreal +0x15265a9c const::lambda::operator() (MaterialRenderProxy.cpp:781) libU… --- ## [SetCubemapBlend function is working incorrectly with Lumen enabled](https://forums.unrealengine.com/t/setcubemapblend-function-is-working-incorrectly-with-lumen-enabled/2589029)
**Author:** [@BineeMan](https://forums.unrealengine.com/u/BineeMan)\ **Replies:** 1\ **Last updated:** [August 22, 2025, 9:25am UTC](https://forums.unrealengine.com/t/setcubemapblend-function-is-working-incorrectly-with-lumen-enabled/2589029 "2025-08-22T09:25:09Z")
I am using USkyLightComponent::SetCubemapBlend(UTextureCube\* SourceCubemap, UTextureCube\* DestinationCubemap, float InBlendFraction) function to create a smooth blend between two cubemaps in my scene. But the problem i… --- ## [RTX LSS ](https://forums.unrealengine.com/t/rtx-lss/2658592)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 1\ **Last updated:** [August 22, 2025, 8:05am UTC](https://forums.unrealengine.com/t/rtx-lss/2658592 "2025-08-22T08:05:32Z")
Is Unreal adding support for RTX LSS? https://developer.nvidia.com/blog/render\\-path\\-traced\\-hair\\-in\\-real\\-time\\-with\\-nvidia\\-geforce\\-rtx\\-50\\-series\\-gpus/ --- ## [Niagara Module Scripts: How do I connect function inputs to a variable in the map get? ](https://forums.unrealengine.com/t/niagara-module-scripts-how-do-i-connect-function-inputs-to-a-variable-in-the-map-get/2655308)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 2\ **Last updated:** [August 22, 2025, 7:54am UTC](https://forums.unrealengine.com/t/niagara-module-scripts-how-do-i-connect-function-inputs-to-a-variable-in-the-map-get/2655308 "2025-08-22T07:54:51Z")
Hello, I’m trying to build a niagara module script, which uses an input curve, similar like the built in scale sprite size module does it. I created a new input parameter map, but there is no option to connect the curv… --- ## [Low Lumen+Nanite distant quality](https://forums.unrealengine.com/t/low-lumen-nanite-distant-quality/2649926)
**Author:** [@YosiSK](https://forums.unrealengine.com/u/YosiSK)\ **Replies:** 0\ **Last updated:** [August 22, 2025, 7:45am UTC](https://forums.unrealengine.com/t/low-lumen-nanite-distant-quality/2649926 "2025-08-22T07:45:54Z")
Hello, I have a question/topic regarding - is there a way to preserve detail in geometry (mostly foliage) when using Lumen with Nanite? Here are some examples: Lumen Pathtracer As you can see, the difference is… --- ## [How can I make an emissive material „glow“ through glass?](https://forums.unrealengine.com/t/how-can-i-make-an-emissive-material-glow-through-glass/2649404)
**Author:** [@chuck\_wiese](https://forums.unrealengine.com/u/chuck_wiese)\ **Replies:** 2\ **Last updated:** [August 22, 2025, 6:06am UTC](https://forums.unrealengine.com/t/how-can-i-make-an-emissive-material-glow-through-glass/2649404 "2025-08-22T06:06:52Z")
Hello, for my actuall car project i want to create headlight with Daytime Running Light turned on. I need a bit of glow for that. The glow allways disapear behind the glas, allthought the emissive mterial is very strong… --- ## [UE5.3 lumen reflection mirror problem](https://forums.unrealengine.com/t/ue5-3-lumen-reflection-mirror-problem/1302933)
**Author:** [@pcxx](https://forums.unrealengine.com/u/pcxx)\ **Replies:** 5\ **Last updated:** [August 22, 2025, 1:01am UTC](https://forums.unrealengine.com/t/ue5-3-lumen-reflection-mirror-problem/1302933 "2025-08-22T01:01:43Z")
Hello I use UE 5.3.0-Lumen for GI and reflections. In my mirror: A - no problem B - sploches C - black surfaces D - light and shadows problems Can i have helps, please --- ## [Shadows disappear in the build for some of the players in my game](https://forums.unrealengine.com/t/shadows-disappear-in-the-build-for-some-of-the-players-in-my-game/2647346)
**Author:** [@BiaXThePanda1](https://forums.unrealengine.com/u/BiaXThePanda1)\ **Replies:** 4\ **Last updated:** [August 21, 2025, 11:49pm UTC](https://forums.unrealengine.com/t/shadows-disappear-in-the-build-for-some-of-the-players-in-my-game/2647346 "2025-08-21T23:49:47Z")
Hi, this bug never happened to me before in my game. But a player sent me this photo. For me, even with the lowest quality in my game I don’t get this lighting. But there seems to be a issue about their global illuminati… --- ## [Artifacts and stains on Metahuman from lighting (Unreal 5.6)](https://forums.unrealengine.com/t/artifacts-and-stains-on-metahuman-from-lighting-unreal-5-6/2648566)
**Author:** [@Inngvarr](https://forums.unrealengine.com/u/Inngvarr)\ **Replies:** 4\ **Last updated:** [August 21, 2025, 9:58pm UTC](https://forums.unrealengine.com/t/artifacts-and-stains-on-metahuman-from-lighting-unreal-5-6/2648566 "2025-08-21T21:58:23Z")
On the characters’ faces and clothes in engine version 5.6 there are such artifacts. Lumen is on. How can I fix it? --- ## [Assert loop when using Light Function Material alongside Raytracing ](https://forums.unrealengine.com/t/assert-loop-when-using-light-function-material-alongside-raytracing/2658407)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 12\ **Last updated:** [August 21, 2025, 9:40pm UTC](https://forums.unrealengine.com/t/assert-loop-when-using-light-function-material-alongside-raytracing/2658407 "2025-08-21T21:40:41Z")
Using Lighting functions with our ray tracing settings causes a constant assert loop over an incorrect number of bindings. BoundCBVMask is 29, missing the bit for the index 1 buffer across 5 bits, NumCBs is 4. Seems rel… --- ## [Lumen + shadow flickering depending on distance and light attenuation radius in 5.4.1](https://forums.unrealengine.com/t/lumen-shadow-flickering-depending-on-distance-and-light-attenuation-radius-in-5-4-1/1957999)
**Author:** [@MythscapeStudio](https://forums.unrealengine.com/u/MythscapeStudio)\ **Replies:** 1\ **Last updated:** [August 21, 2025, 7:53pm UTC](https://forums.unrealengine.com/t/lumen-shadow-flickering-depending-on-distance-and-light-attenuation-radius-in-5-4-1/1957999 "2025-08-21T19:53:24Z")
I’ve upgraded my project from 5.3 to 5.4.1 and started to notice a shadow flickering effect. Here’s an example - https://www.youtube.com/watch?v=LPKktlk0Fyw The flickering appears when either the distance from camera i… --- ## [UE 5.6 Lumen cannot be enabled](https://forums.unrealengine.com/t/ue-5-6-lumen-cannot-be-enabled/2634552)
**Author:** [@Gusseknudsen](https://forums.unrealengine.com/u/Gusseknudsen)\ **Replies:** 5\ **Last updated:** [August 21, 2025, 4:40pm UTC](https://forums.unrealengine.com/t/ue-5-6-lumen-cannot-be-enabled/2634552 "2025-08-21T16:40:50Z")
No matter what I try, I can not get Lumen to work, it keeps sayin that it’s not enabled! I’ve tried so many things, and reinstalled ue 5.6, verify, new empty projects, updated graphic drivers (RTX 4070) but nothing works… --- ## [Light hard cut off at certain radius.](https://forums.unrealengine.com/t/light-hard-cut-off-at-certain-radius/2649279)
**Author:** [@ozogonkiem](https://forums.unrealengine.com/u/ozogonkiem)\ **Replies:** 0\ **Last updated:** [August 21, 2025, 2:42pm UTC](https://forums.unrealengine.com/t/light-hard-cut-off-at-certain-radius/2649279 "2025-08-21T14:42:45Z")
Hi, I saw similar issue to mine in the post from 2018 but it wasn’t resolved so I will try my luck with new topic :smiley: I am working on a standalone VR project with baked lighting, Forward Shading enabled, GI set to … --- ## [Weird Landscape shadows (also in Unlit Mode) with and without RVT ](https://forums.unrealengine.com/t/weird-landscape-shadows-also-in-unlit-mode-with-and-without-rvt/2649198)
**Author:** [@Micsa\_Dan](https://forums.unrealengine.com/u/Micsa_Dan)\ **Replies:** 2\ **Last updated:** [August 21, 2025, 3:15pm UTC](https://forums.unrealengine.com/t/weird-landscape-shadows-also-in-unlit-mode-with-and-without-rvt/2649198 "2025-08-21T15:15:39Z")
Hi, I have not seen a similar topic opened elsewhere, if I am wrong please help me with links. When I closed my computer everything was fine, after opening it today I observed I have weird shadows in some parts of my la… --- ## [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… --- ## [Niagara Data Interface GetFeedback() error text not showing consistently ](https://forums.unrealengine.com/t/niagara-data-interface-getfeedback-error-text-not-showing-consistently/2656250)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 4\ **Last updated:** [August 21, 2025, 9:58am UTC](https://forums.unrealengine.com/t/niagara-data-interface-getfeedback-error-text-not-showing-consistently/2656250 "2025-08-21T09:58:09Z")
Hi! I’ve noticed that the details of the errors returned from UNiagaraDataInterface::GetFeedback are only presented in the UI of the Particle System editor after the particle system editor is closed and reopened. If I cr… --- ## [Missing PSO Precaches in the engine ](https://forums.unrealengine.com/t/missing-pso-precaches-in-the-engine/2658420)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 4\ **Last updated:** [August 21, 2025, 8:47am UTC](https://forums.unrealengine.com/t/missing-pso-precaches-in-the-engine/2658420 "2025-08-21T08:47:20Z")
Hi, I wanted to report some more missing PSO Precaching we found in Epic code which we have fixed locally in case it helps others: UCableComponent doesn’t implement CollectPSOPrecacheData or call CheckPSOPrecachingAnd… --- ## [Disabling displacement material attribute, quality, performance ](https://forums.unrealengine.com/t/disabling-displacement-material-attribute-quality-performance/2659408)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 3\ **Last updated:** [August 26, 2025, 2:12am UTC](https://forums.unrealengine.com/t/disabling-displacement-material-attribute-quality-performance/2659408 "2025-08-26T02:12:28Z")
Hey, We’re using Displacement material attribute in our materials. For performance reasons, we’d like to skip this feature for slower hardware (like XSS or worse PC configs). The idea was to use Material Quality switch a… --- ## [help with realism to the scene](https://forums.unrealengine.com/t/help-with-realism-to-the-scene/2648062)
**Author:** [@Studiosme](https://forums.unrealengine.com/u/Studiosme)\ **Replies:** 1\ **Last updated:** [August 21, 2025, 1:56am UTC](https://forums.unrealengine.com/t/help-with-realism-to-the-scene/2648062 "2025-08-21T01:56:25Z")
Hi Guys, I need a help to help us adding more realism to our scene - maybe help with lighting or greenery settings. Is there anyone here who can open the scene and see what’s wrong with it? Of course, I’d be happy to tha… --- ## [PSO precache loading screen ](https://forums.unrealengine.com/t/pso-precache-loading-screen/2658405)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 15\ **Last updated:** [August 21, 2025, 12:14pm UTC](https://forums.unrealengine.com/t/pso-precache-loading-screen/2658405 "2025-08-21T12:14:49Z")
I’ve been trying to get a loading screen working for the start of a game to compile the shaders and then skip this menu when the player launches the game again. After running the game with -clearPSODriverCache it loads … --- ## [Significant artificing in the reflection when hair and cloth shading models overlap in 5.5.4 ](https://forums.unrealengine.com/t/significant-artificing-in-the-reflection-when-hair-and-cloth-shading-models-overlap-in-5-5-4/2658136)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 3\ **Last updated:** [August 21, 2025, 12:31am UTC](https://forums.unrealengine.com/t/significant-artificing-in-the-reflection-when-hair-and-cloth-shading-models-overlap-in-5-5-4/2658136 "2025-08-21T00:31:37Z")
There is significant aliasing artefacting on the cloth shading model when overlapping with the hair shading model. This occurs at the point where they overlap there seems to be some kind aliasing effect. Additional in… --- ## [Why is this material looking weird in one level but not another?](https://forums.unrealengine.com/t/why-is-this-material-looking-weird-in-one-level-but-not-another/2648563)
**Author:** [@Elryk1](https://forums.unrealengine.com/u/Elryk1)\ **Replies:** 1\ **Last updated:** [August 20, 2025, 10:46pm UTC](https://forums.unrealengine.com/t/why-is-this-material-looking-weird-in-one-level-but-not-another/2648563 "2025-08-20T22:46:33Z")
In one level, the material looks like it is supposed to: In another level, it looks all weird: It is a different actor class, but both static meshes are just a basic sphere. All settings for the static mesh of bo… --- ## [Separable Subsurface Scattering in UE4 ?](https://forums.unrealengine.com/t/separable-subsurface-scattering-in-ue4/18979)
**Author:** [@PLASTICA-MAN](https://forums.unrealengine.com/u/PLASTICA-MAN)\ **Replies:** 13\ **Last updated:** [August 20, 2025, 7:58pm UTC](https://forums.unrealengine.com/t/separable-subsurface-scattering-in-ue4/18979 "2025-08-20T19:58:29Z")
Greetings everyone. My thread is adressed to Epic devs mainly. In fact Mr Ivey told me to make a thread about it so devs will look into it. Many of you surely know Jorge Jimenez: the creator of SMAA and SSSSS (Screen Sp… --- ## [Using Custom Data Outputs and accessing them through scenetexture in post process](https://forums.unrealengine.com/t/using-custom-data-outputs-and-accessing-them-through-scenetexture-in-post-process/443080)
**Author:** [@kroleus](https://forums.unrealengine.com/u/kroleus)\ **Replies:** 5\ **Last updated:** [August 20, 2025, 7:56pm UTC](https://forums.unrealengine.com/t/using-custom-data-outputs-and-accessing-them-through-scenetexture-in-post-process/443080 "2025-08-20T19:56:57Z")
This will be a long question, so bear with me, I have some explaining to do. So I’ve been working on this comic book shader for a little bit. I’ve gotten it looking the way I want it so I don’t really need critique … --- ## [What are the difference between landscape layer blend types?](https://forums.unrealengine.com/t/what-are-the-difference-between-landscape-layer-blend-types/380276)
**Author:** [@Bora\_Semiz](https://forums.unrealengine.com/u/Bora_Semiz)\ **Replies:** 4\ **Last updated:** [August 20, 2025, 7:31pm UTC](https://forums.unrealengine.com/t/what-are-the-difference-between-landscape-layer-blend-types/380276 "2025-08-20T19:31:32Z")
I am new to computer game graphics and terminology. I don’t have problems reading the C++ programming documentation of unreal engine, however when it comes to rendering and graphics, I feel like I am reading a medical dr… --- ## [How do I use sampling regions?](https://forums.unrealengine.com/t/how-do-i-use-sampling-regions/460625)
**Author:** [@HankP1](https://forums.unrealengine.com/u/HankP1)\ **Replies:** 9\ **Last updated:** [August 20, 2025, 5:08pm UTC](https://forums.unrealengine.com/t/how-do-i-use-sampling-regions/460625 "2025-08-20T17:08:41Z")
I want to control the rate at which particles are released or released only in certain parts of the skeleton mesh in Niagara. I think that’s the tab Sampling Region. How should I use it? I don’t know where to make the fi… --- ## [Why does UDK look better than UE4?](https://forums.unrealengine.com/t/why-does-udk-look-better-than-ue4/2028549)
**Author:** [@mdawn845](https://forums.unrealengine.com/u/mdawn845)\ **Replies:** 11\ **Last updated:** [August 20, 2025, 2:23pm UTC](https://forums.unrealengine.com/t/why-does-udk-look-better-than-ue4/2028549 "2025-08-20T14:23:26Z")
I don’t know what causes it, I thought it was the tonemapper so I modified it to output linear colors and got closer to the target graphics but it still isn’t enough. Also if I understand correctly UDK does lighting dif… --- ## [Point Light not working if duplicating in Unreal Engine 5.3 in path tracing mode. ](https://forums.unrealengine.com/t/point-light-not-working-if-duplicating-in-unreal-engine-5-3-in-path-tracing-mode/2348842)
**Author:** [@Japitopes](https://forums.unrealengine.com/u/Japitopes)\ **Replies:** 1\ **Last updated:** [August 20, 2025, 10:56am UTC](https://forums.unrealengine.com/t/point-light-not-working-if-duplicating-in-unreal-engine-5-3-in-path-tracing-mode/2348842 "2025-08-20T10:56:32Z")
The first point light is working but when I duplicated it. It doesn’t show in path tracing mode. I tried changing to static, stationary and moveable and toggling cast shadows on and off but it doesn’t work. I’m tryin… --- ## [Niagara Data channels - not able to cast shadows ](https://forums.unrealengine.com/t/niagara-data-channels-not-able-to-cast-shadows/2658142)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 4\ **Last updated:** [August 20, 2025, 4:37pm UTC](https://forums.unrealengine.com/t/niagara-data-channels-not-able-to-cast-shadows/2658142 "2025-08-20T16:37:45Z")
Hi, I’m facing an issue where I want to spawn mesh particles from a Niagara data channel using the islands mode, but I want to have those mesh particles cast shadows. The problem I’m facing is that in order to cast shado… [Previous page](https://forums.unrealengine.com/c/development-discussion/rendering/36.md?page=98) [Next page](https://forums.unrealengine.com/c/development-discussion/rendering/36.md?page=100)