# Programming & Scripting **URL:** https://forums.unrealengine.com/c/development-discussion/programming-scripting/148.md?page=3 [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) **Page:** 4 --- ## [i need help to open the data ](https://forums.unrealengine.com/t/i-need-help-to-open-the-data/2851711)
**Author:** [@tesh\_baa](https://forums.unrealengine.com/u/tesh_baa)\ **Replies:** 0\ **Last updated:** [November 6, 2026, 7:40pm UTC](https://forums.unrealengine.com/t/i-need-help-to-open-the-data/2851711 "2026-11-06T19:40:17Z")
das is die nachricht die kam: Fehler beim Öffnen von Projekt //mvsdc1/homes$/J.Langhagel/Downloads/Redvblue/Redvblue/Redvblue.uefnproject. Projektdatei konnte nicht gelesen werden /dc1/hoes$/Jel/Downloads/Redvblue/Red… --- ## [Dynamic Material Instance weirdness](https://forums.unrealengine.com/t/dynamic-material-instance-weirdness/2850200)
**Author:** [@aerospike\_andy](https://forums.unrealengine.com/u/aerospike_andy)\ **Replies:** 4\ **Last updated:** [November 6, 2026, 4:47pm UTC](https://forums.unrealengine.com/t/dynamic-material-instance-weirdness/2850200 "2026-11-06T16:47:24Z")
Hi All, So I am trying to set a material to be translucent so i can (at run time) affect its opacity and make it fade in and out. However…when I change the material from “opaque” to “translucentcolortransmittance” and s… --- ## [What does the blackboard decorator do exactly? (+help with my decorator if possible) ](https://forums.unrealengine.com/t/what-does-the-blackboard-decorator-do-exactly-help-with-my-decorator-if-possible/2850993)
**Author:** [@LHopeBusiness](https://forums.unrealengine.com/u/LHopeBusiness)\ **Replies:** 3\ **Last updated:** [November 6, 2026, 4:43pm UTC](https://forums.unrealengine.com/t/what-does-the-blackboard-decorator-do-exactly-help-with-my-decorator-if-possible/2850993 "2026-11-06T16:43:04Z")
I understand that it’s a case of “if this is that, do this” but for some reason mine is firing off either way. I have it linked to a float key that I set when a task is fired off. For some reason, it aborts the sequence … --- ## [5.8 Gameplay Camera System Issue Causing Crashes ](https://forums.unrealengine.com/t/5-8-gameplay-camera-system-issue-causing-crashes/2846408)
**Author:** [@RunawayRobot](https://forums.unrealengine.com/u/RunawayRobot)\ **Replies:** 1\ **Last updated:** [November 6, 2026, 4:05pm UTC](https://forums.unrealengine.com/t/5-8-gameplay-camera-system-issue-causing-crashes/2846408 "2026-11-06T16:05:22Z")
Since updating to 5.8 the Gameplay Camera system force crashes Unreal when you attempt to build, then save, a Camera Asset. I thought this issue was in fact a different one that had been solved on a different thread last… --- ## [Disabling Lumen and Nanite makes the shadows look smudgy? ](https://forums.unrealengine.com/t/disabling-lumen-and-nanite-makes-the-shadows-look-smudgy/2851093)
**Author:** [@FizzyBomb](https://forums.unrealengine.com/u/FizzyBomb)\ **Replies:** 2\ **Last updated:** [November 6, 2026, 2:05pm UTC](https://forums.unrealengine.com/t/disabling-lumen-and-nanite-makes-the-shadows-look-smudgy/2851093 "2026-11-06T14:05:49Z")
Hey all, I’ve followed this tutorial to disable lumen and nanite (the game I’m creating doesn’t require heavy lighting and shadows so I’m working to optimise them the best I can), but after restarting my project the shad… --- ## [How to setup EQS parameters when using the Run EQS Query BT Task with the query stored in a blackboard key?](https://forums.unrealengine.com/t/how-to-setup-eqs-parameters-when-using-the-run-eqs-query-bt-task-with-the-query-stored-in-a-blackboard-key/1968304)
**Author:** [@Reittoil](https://forums.unrealengine.com/u/Reittoil)\ **Replies:** 1\ **Last updated:** [November 6, 2026, 12:35pm UTC](https://forums.unrealengine.com/t/how-to-setup-eqs-parameters-when-using-the-run-eqs-query-bt-task-with-the-query-stored-in-a-blackboard-key/1968304 "2026-11-06T12:35:12Z")
Hi there, As stated in the question title, I’m using UBTTask\_RunEQSQuery’s “EQSQuery Blackboard Key” parameter to dynamically inject the type of EQS query to execute in my behavior trees. However when doing so, I’m una… --- ## [Day 10 - Item Usage System in C++ (Unreal Engine 5)](https://forums.unrealengine.com/t/day-10-item-usage-system-in-c-unreal-engine-5/2849954)
**Author:** [@kevinpc\_1](https://forums.unrealengine.com/u/kevinpc_1)\ **Replies:** 3\ **Last updated:** [November 6, 2026, 11:25am UTC](https://forums.unrealengine.com/t/day-10-item-usage-system-in-c-unreal-engine-5/2849954 "2026-11-06T11:25:54Z")
Hello everyone, I’ve just completed Day 10 of my Unreal Engine 5 Gameplay Engineer journey. Today I implemented an Item Usage System completely in C++. Features implemented: :white\_check\_mark: IA\_UseItem Input Action … --- ## [Day 12 - Consumable Item Removal System in C++ (Unreal Engine 5)](https://forums.unrealengine.com/t/day-12-consumable-item-removal-system-in-c-unreal-engine-5/2851484)
**Author:** [@kevinpc\_1](https://forums.unrealengine.com/u/kevinpc_1)\ **Replies:** 0\ **Last updated:** [November 6, 2026, 11:24am UTC](https://forums.unrealengine.com/t/day-12-consumable-item-removal-system-in-c-unreal-engine-5/2851484 "2026-11-06T11:24:25Z")
Hello everyone, I’ve just completed Day 12 of my Unreal Engine 5 Gameplay Engineer journey. Today I improved my consumable item system by implementing inventory item removal after usage. Features implemented: … --- ## [Collision Box being destroyed by pickup object ](https://forums.unrealengine.com/t/collision-box-being-destroyed-by-pickup-object/2849106)
**Author:** [@DollRotting](https://forums.unrealengine.com/u/DollRotting)\ **Replies:** 1\ **Last updated:** [November 6, 2026, 9:55am UTC](https://forums.unrealengine.com/t/collision-box-being-destroyed-by-pickup-object/2849106 "2026-11-06T09:55:18Z")
I have a collision box that I want to be destroyed when an object that is picked up by the player is pressed against it, I have a pretty good idea on how to do the pickup system itself, but how do I assign the collision … --- ## [Verse Validation Failed ](https://forums.unrealengine.com/t/verse-validation-failed/2850244)
**Author:** [@sallinwagercarry](https://forums.unrealengine.com/u/sallinwagercarry)\ **Replies:** 1\ **Last updated:** [November 6, 2026, 5:55am UTC](https://forums.unrealengine.com/t/verse-validation-failed/2850244 "2026-11-06T05:55:13Z")
--- ## [The function called "Wait Input Release"](https://forums.unrealengine.com/t/the-function-called-wait-input-release/839976)
**Author:** [@stageq](https://forums.unrealengine.com/u/stageq)\ **Replies:** 14\ **Last updated:** [November 6, 2026, 5:40am UTC](https://forums.unrealengine.com/t/the-function-called-wait-input-release/839976 "2026-11-06T05:40:18Z")
I use this function in my jump ability blueprint (like lyragame), but when I print some test string, I found the function does not work.Caused by any configures missed? --- ## [Launcher 20.3.6: Engine Versions empty. ](https://forums.unrealengine.com/t/launcher-20-3-6-engine-versions-empty/2849173)
**Author:** [@davendivendaven](https://forums.unrealengine.com/u/davendivendaven)\ **Replies:** 1\ **Last updated:** [November 5, 2026, 6:53pm UTC](https://forums.unrealengine.com/t/launcher-20-3-6-engine-versions-empty/2849173 "2026-11-05T18:53:16Z")
Hola: No puedo instalar Unreal Engine 5.8. En Epic Games Launcher 20.3.7 para Windows, Unreal Engine \> Biblioteca no muestra ninguna versión. Los botones “Instalar motor” y “+” no responden. El registro del Launcher mu… --- ## [LAN and Steam multiplayer. Steam works, Land doesn't](https://forums.unrealengine.com/t/lan-and-steam-multiplayer-steam-works-land-doesnt/2850382)
**Author:** [@Gabasourus123](https://forums.unrealengine.com/u/Gabasourus123)\ **Replies:** 3\ **Last updated:** [November 5, 2026, 6:38pm UTC](https://forums.unrealengine.com/t/lan-and-steam-multiplayer-steam-works-land-doesnt/2850382 "2026-11-05T18:38:24Z")
I am making a multiplayer game using blueprints. I have added steam subsystems/sockets and have gotten it working with two machines in my house. I tried adding LAN with a checkbox but when I try finding the lobby it does… --- ## [A Practical Housing Guide for MSCW Players with U4N ](https://forums.unrealengine.com/t/a-practical-housing-guide-for-mscw-players-with-u4n/2851096)
**Author:** [@RipeUnicorn2941](https://forums.unrealengine.com/u/RipeUnicorn2941)\ **Replies:** 0\ **Last updated:** [November 5, 2026, 6:38pm UTC](https://forums.unrealengine.com/t/a-practical-housing-guide-for-mscw-players-with-u4n/2851096 "2026-11-05T18:38:19Z")
Player housing adds a new layer of progression to MapleStory Classic World. Instead of spending all your time leveling characters and collecting MapleStory Classic World Items, you can now work toward building a permanen… --- ## [message d'erreur ](https://forums.unrealengine.com/t/message-derreur/2851092)
**Author:** [@ASC\_TsK](https://forums.unrealengine.com/u/ASC_TsK)\ **Replies:** 1\ **Last updated:** [November 5, 2026, 6:55pm UTC](https://forums.unrealengine.com/t/message-derreur/2851092 "2026-11-05T18:55:34Z")
A chaque partie que je lance 2min après ca me fais quitter avec un message d’erreur alors que je n’est rien fais de mal et j’ai rien qui bloque sur mon pc --- ## [Switching levels without loosing any data](https://forums.unrealengine.com/t/switching-levels-without-loosing-any-data/2169305)
**Author:** [@YxxN](https://forums.unrealengine.com/u/YxxN)\ **Replies:** 2\ **Last updated:** [November 5, 2026, 6:00pm UTC](https://forums.unrealengine.com/t/switching-levels-without-loosing-any-data/2169305 "2026-11-05T18:00:21Z")
Hi. I am trying to switch Levels and when I do so, keep all the processes on going. There are 2 Levels in my project and each levels are mapped with a UMG. Each UMGs operate differently and what I want is the process f… --- ## [They want to remove Blueprint in UE6](https://forums.unrealengine.com/t/they-want-to-remove-blueprint-in-ue6/2729352)
**Author:** [@Yaeko](https://forums.unrealengine.com/u/Yaeko)\ **Replies:** 421\ **Last updated:** [November 5, 2026, 4:02pm UTC](https://forums.unrealengine.com/t/they-want-to-remove-blueprint-in-ue6/2729352 "2026-11-05T16:02:43Z")
Since we dont have a place for this, at least from what I could find on the forums, I drop it here - feel free to move if needed. Source: https://www.unrealengine.com/news/the-road-to-ue-6 This will be one hell of a tr… --- ## [Core Redirects of C++ Classes API like LYRAGAME\_API](https://forums.unrealengine.com/t/core-redirects-of-c-classes-api-like-lyragame-api/2850941)
**Author:** [@Ruslanmin2](https://forums.unrealengine.com/u/Ruslanmin2)\ **Replies:** 1\ **Last updated:** [November 5, 2026, 2:58pm UTC](https://forums.unrealengine.com/t/core-redirects-of-c-classes-api-like-lyragame-api/2850941 "2026-11-05T14:58:46Z")
How to create in C++ Core Redirects of C++ classes from one API to another API. If you declare UE Class you specify api. I want to change it using core redirects to use Lyra C++ Classes and blueprints without rewriting a… --- ## [Lyra UI classes and blueprints Integration in test project](https://forums.unrealengine.com/t/lyra-ui-classes-and-blueprints-integration-in-test-project/2842136)
**Author:** [@Ruslanmin2](https://forums.unrealengine.com/u/Ruslanmin2)\ **Replies:** 10\ **Last updated:** [November 5, 2026, 1:47pm UTC](https://forums.unrealengine.com/t/lyra-ui-classes-and-blueprints-integration-in-test-project/2842136 "2026-11-05T13:47:41Z")
Hi, I am adding Lyra UI C++ code in test project, and at this moment UI partially works. And I am looking for people who have familiar with Lyra Framework and can help me. I have problem with settings window: I have… --- ## [Unable to Launch Memory Calc ](https://forums.unrealengine.com/t/unable-to-launch-memory-calc/2849144)
**Author:** [@Splatr97](https://forums.unrealengine.com/u/Splatr97)\ **Replies:** 2\ **Last updated:** [November 5, 2026, 12:29pm UTC](https://forums.unrealengine.com/t/unable-to-launch-memory-calc/2849144 "2026-11-05T12:29:20Z")
Memory Calculation Failing, tried restarting, launching session… everything and this is from the output log… could anyone help. Thanks LogValkyrieMemoryCalculation: Warning: Memory calculation failed: Valkyrie::MemoryCa… --- ## [Day 11 - Consumable Items System in C++ (Unreal Engine 5)](https://forums.unrealengine.com/t/day-11-consumable-items-system-in-c-unreal-engine-5/2850917)
**Author:** [@kevinpc\_1](https://forums.unrealengine.com/u/kevinpc_1)\ **Replies:** 0\ **Last updated:** [November 5, 2026, 11:30am UTC](https://forums.unrealengine.com/t/day-11-consumable-items-system-in-c-unreal-engine-5/2850917 "2026-11-05T11:30:51Z")
Hello everyone, I’ve just completed Day 11 of my Unreal Engine 5 Gameplay Engineer journey. Today I implemented a Consumable Items System completely in C++ and connected it with my existing Inventory, Equipment, Item U… --- ## [MassAI Replication State in 5.7 and future roadmap?](https://forums.unrealengine.com/t/massai-replication-state-in-5-7-and-future-roadmap/2684012)
**Author:** [@anonymous-edc](https://forums.unrealengine.com/u/anonymous-edc)\ **Replies:** 11\ **Last updated:** [November 5, 2026, 9:12am UTC](https://forums.unrealengine.com/t/massai-replication-state-in-5-7-and-future-roadmap/2684012 "2026-11-05T09:12:58Z")
We are using 5.7 Preview to check out the latest MassAI implementation with StateTree and mostly replication support state. There are some major problems with replication the entities transform and Crowd LOD system. (us… --- ## [Floating Pawn Movement + Nav Mesh = Teleporting?](https://forums.unrealengine.com/t/floating-pawn-movement-nav-mesh-teleporting/325020)
**Author:** [@Slowmanrunning](https://forums.unrealengine.com/u/Slowmanrunning)\ **Replies:** 3\ **Last updated:** [November 5, 2026, 6:54am UTC](https://forums.unrealengine.com/t/floating-pawn-movement-nav-mesh-teleporting/325020 "2026-11-05T06:54:31Z")
I’m trying to make an RTS style game and I want to have my unit pawns move towards where I right click. I have that, but currently they’re teleporting (or moving really, really fast) there and adjusting the speed in the … --- ## [Install Engine and the + button didn't work ](https://forums.unrealengine.com/t/install-engine-and-the-button-didnt-work/2846413)
**Author:** [@18b68e8daff547238563ed7d261fb49f](https://forums.unrealengine.com/u/18b68e8daff547238563ed7d261fb49f)\ **Replies:** 1\ **Last updated:** [November 4, 2026, 8:23pm UTC](https://forums.unrealengine.com/t/install-engine-and-the-button-didnt-work/2846413 "2026-11-04T20:23:49Z")
Epic Games Launcher 20.3.6 on Windows 11. Unreal Engine \> Library shows no engine versions. Install Engine and the + button do nothing. Please check and grant or repair the Unreal Engine entitlement for my account. I… --- ## [Je voudrais donner mes idée pour unreal Engine ](https://forums.unrealengine.com/t/je-voudrais-donner-mes-idee-pour-unreal-engine/2850248)
**Author:** [@DIEUXDELAGUERRE7](https://forums.unrealengine.com/u/DIEUXDELAGUERRE7)\ **Replies:** 0\ **Last updated:** [November 4, 2026, 7:42pm UTC](https://forums.unrealengine.com/t/je-voudrais-donner-mes-idee-pour-unreal-engine/2850248 "2026-11-04T19:42:52Z")
Subject: Community Submission: Next-Gen Unified Rendering Architecture Pitch (Hyperion Project) Dear Epic Games Team, As a passionate gamer and technology enthusiast, I have been following the evolution of Unreal Engin… --- ## [Make mover face object (GASP)? ](https://forums.unrealengine.com/t/make-mover-face-object-gasp/2849133)
**Author:** [@kamidres2](https://forums.unrealengine.com/u/kamidres2)\ **Replies:** 1\ **Last updated:** [November 4, 2026, 7:32pm UTC](https://forums.unrealengine.com/t/make-mover-face-object-gasp/2849133 "2026-11-04T19:32:37Z")
To anyone whom may have more experience with unreal engine how I could go about making the sandbox mover in GASP 5.8 face another blueprint class (like a lock on system) but at all times. it’s usually easy on blank proj… --- ## [UEFN 43.00: can NPCs use native building, wall replacement, edits and resets? ](https://forums.unrealengine.com/t/uefn-43-00-can-npcs-use-native-building-wall-replacement-edits-and-resets/2850177)
**Author:** [@\_1619](https://forums.unrealengine.com/u/_1619)\ **Replies:** 0\ **Last updated:** [November 4, 2026, 4:38pm UTC](https://forums.unrealengine.com/t/uefn-43-00-can-npcs-use-native-building-wall-replacement-edits-and-resets/2850177 "2026-11-04T16:38:18Z")
Hello Epic team, I am developing a Box Fight training island and need to clarify whether a Guard or custom NPC can use Fortnite’s actual player-building mechanics in a publishable UEFN experience. The required behavior… --- ## [Custom K2Node with an output pin in the header (like event nodes)](https://forums.unrealengine.com/t/custom-k2node-with-an-output-pin-in-the-header-like-event-nodes/2849464)
**Author:** [@NuclearApplejack](https://forums.unrealengine.com/u/NuclearApplejack)\ **Replies:** 4\ **Last updated:** [November 4, 2026, 12:41pm UTC](https://forums.unrealengine.com/t/custom-k2node-with-an-output-pin-in-the-header-like-event-nodes/2849464 "2026-11-04T12:41:51Z")
I’m creating a custom K2Node, and would like to have it have an output pin in its header, just like event nodes have an output delegate pin in their headers. The node I’m making has nothing to do with events or deleg… --- ## [\[MVVM\] How to use "Context" CreationType properly ? ](https://forums.unrealengine.com/t/mvvm-how-to-use-context-creationtype-properly/2845766)
**Author:** [@midiphony-panda](https://forums.unrealengine.com/u/midiphony-panda)\ **Replies:** 4\ **Last updated:** [November 4, 2026, 10:23am UTC](https://forums.unrealengine.com/t/mvvm-how-to-use-context-creationtype-properly/2845766 "2026-11-04T10:23:46Z")
Hello, I’m trying to use the Context ViewModel CreationType on a child Widget Blueprint (WBP). But it never works the way I’d expect. In short, when I try to use this type in a child WBP, the ViewModel doesn’t get set … --- ## [How to deal with keyboard layouts?](https://forums.unrealengine.com/t/how-to-deal-with-keyboard-layouts/2504539)
**Author:** [@Adamen111](https://forums.unrealengine.com/u/Adamen111)\ **Replies:** 6\ **Last updated:** [November 4, 2026, 8:50am UTC](https://forums.unrealengine.com/t/how-to-deal-with-keyboard-layouts/2504539 "2026-11-04T08:50:35Z")
Keyboard Localization Issue in Unreal Engine Hello, I have an issue that’s driving me crazy, and its keyboard localization for input handling. I am a beginner in Unreal Engine (love it so far), so please go easy on me. … [Previous page](https://forums.unrealengine.com/c/development-discussion/programming-scripting/148.md?page=2) [Next page](https://forums.unrealengine.com/c/development-discussion/programming-scripting/148.md?page=4)