# \#object **URL:** https://forums.unrealengine.com/tag/object/1377.md [Latest](https://forums.unrealengine.com/latest.md) · [Categories](https://forums.unrealengine.com/categories.md) · [Tags](https://forums.unrealengine.com/tags.md) --- ## [How to assign an empty item to an index in an object array?](https://forums.unrealengine.com/t/how-to-assign-an-empty-item-to-an-index-in-an-object-array/2744299)
**Author:** [@SemanticRain619](https://forums.unrealengine.com/u/SemanticRain619)\ **Replies:** 5\ **Last updated:** [August 18, 2026, 5:31am UTC](https://forums.unrealengine.com/t/how-to-assign-an-empty-item-to-an-index-in-an-object-array/2744299 "2026-08-18T05:31:20Z")
I want to clear the items in an array without disrupting the indices; how can I remove the assigned values ​​while keeping the indices intact? I thought I could use “Set Array Elem,” but it didn’t work for this purpose. --- ## [Macro Library: Can't reparent Macro Library with "Object" class](https://forums.unrealengine.com/t/macro-library-cant-reparent-macro-library-with-object-class/324817)
**Author:** [@JoystickMonkey](https://forums.unrealengine.com/u/JoystickMonkey)\ **Replies:** 14\ **Last updated:** [May 12, 2026, 12:34am UTC](https://forums.unrealengine.com/t/macro-library-cant-reparent-macro-library-with-object-class/324817 "2026-05-12T00:34:06Z")
If you make a macro library using Actor as Parent Class, and then try to change Parent Class to Object in Class Settings, search field only finds OnlineBeaconHostObject. --- ## [Get Object Name from DerivedDataCache Key](https://forums.unrealengine.com/t/get-object-name-from-deriveddatacache-key/444117)
**Author:** [@AlejandroGT\_GG](https://forums.unrealengine.com/u/AlejandroGT_GG)\ **Replies:** 2\ **Last updated:** [October 30, 2025, 1:15pm UTC](https://forums.unrealengine.com/t/get-object-name-from-deriveddatacache-key/444117 "2025-10-30T13:15:50Z")
I would like to match up the data in my DDC with an object in the engine. For example, I would like to know exactly which static mesh is causing is creating a 10MB data file in my DDC. Is there a way to translate that … --- ## [How can I ensure that a function owner only receives executions from specific targets?](https://forums.unrealengine.com/t/how-can-i-ensure-that-a-function-owner-only-receives-executions-from-specific-targets/2669551)
**Author:** [@Extrahdmi](https://forums.unrealengine.com/u/Extrahdmi)\ **Replies:** 4\ **Last updated:** [October 30, 2025, 6:45am UTC](https://forums.unrealengine.com/t/how-can-i-ensure-that-a-function-owner-only-receives-executions-from-specific-targets/2669551 "2025-10-30T06:45:21Z")
If the same function is executed from multiple targets, how do I select which target it was executed from and process the function accordingly? For example, if a function is executed from targets A and B, I want to rece… --- ## [Can you use a Blueprint Function Library in an Object Class](https://forums.unrealengine.com/t/can-you-use-a-blueprint-function-library-in-an-object-class/350918)
**Author:** [@Prothean](https://forums.unrealengine.com/u/Prothean)\ **Replies:** 36\ **Last updated:** [September 9, 2025, 7:13pm UTC](https://forums.unrealengine.com/t/can-you-use-a-blueprint-function-library-in-an-object-class/350918 "2025-09-09T19:13:23Z")
From what I can tell, I can call functions that are inside my Blueprint Function Library from a object class blueprint, is there something special I need to do / add in order to reference the library, or is this just not… --- ## [For Each Loop of Replicated Array does not pass Array Element ](https://forums.unrealengine.com/t/for-each-loop-of-replicated-array-does-not-pass-array-element/2646962)
**Author:** [@Vevlex\_1](https://forums.unrealengine.com/u/Vevlex_1)\ **Replies:** 1\ **Last updated:** [August 19, 2025, 5:03pm UTC](https://forums.unrealengine.com/t/for-each-loop-of-replicated-array-does-not-pass-array-element/2646962 "2025-08-19T17:03:13Z")
Hello everyone, I am a new to Unreal and I have encountered an issue that has stumped me for the past week and I cannot figure it out on my own. In summary: I have a multiplayer inventory system. When adding an item I r… --- ## [Spawning a Widget from an Object Class](https://forums.unrealengine.com/t/spawning-a-widget-from-an-object-class/446600)
**Author:** [@MeGaJ0eY](https://forums.unrealengine.com/u/MeGaJ0eY)\ **Replies:** 7\ **Last updated:** [August 6, 2025, 6:16pm UTC](https://forums.unrealengine.com/t/spawning-a-widget-from-an-object-class/446600 "2025-08-06T18:16:56Z")
I am trying to spawn a widget from a class that derives from object, when I compile I get the message: “Pin World Context object must have a connection” however the create widget node has no such pin and I am unable to e… --- ## [How to get object reference of level blueprint?](https://forums.unrealengine.com/t/how-to-get-object-reference-of-level-blueprint/656563)
**Author:** [@HotLemon666](https://forums.unrealengine.com/u/HotLemon666)\ **Replies:** 1\ **Last updated:** [September 26, 2022, 11:31am UTC](https://forums.unrealengine.com/t/how-to-get-object-reference-of-level-blueprint/656563 "2022-09-26T11:31:52Z")
I spend a lot time, still can’t find anyway to get reference of level blueprint. I have blueprint interface included in level blueprint. now I need to call this interface, but in order to this, a reference of level bl… --- ## [Timers do not work in Objects](https://forums.unrealengine.com/t/timers-do-not-work-in-objects/405571)
**Author:** [@Flakky](https://forums.unrealengine.com/u/Flakky)\ **Replies:** 8\ **Last updated:** [May 29, 2025, 3:32am UTC](https://forums.unrealengine.com/t/timers-do-not-work-in-objects/405571 "2025-05-29T03:32:08Z")
Hi! This bug is actually from 4.17, but still not fixed in 4.18. Timers do not work inside Objects in blueprints. To reproduce Create an object class Create event “Init” and connect it with “Set Timer By Function Na… --- ## [Bike Tour Open World](https://forums.unrealengine.com/t/bike-tour-open-world/2467920)
**Author:** [@shinma8](https://forums.unrealengine.com/u/shinma8)\ **Replies:** 0\ **Last updated:** [April 21, 2025, 1:03pm UTC](https://forums.unrealengine.com/t/bike-tour-open-world/2467920 "2025-04-21T13:03:47Z")
New Area Update \[Areas where you can get guns\] CODE: 0269-0121-5748 I created and decorated all the background objects myself. --- ## [Toggle visibility on a 3d object with widget.](https://forums.unrealengine.com/t/toggle-visibility-on-a-3d-object-with-widget/465142)
**Author:** [@SnipesEasy](https://forums.unrealengine.com/u/SnipesEasy)\ **Replies:** 3\ **Last updated:** [May 14, 2020, 3:56pm UTC](https://forums.unrealengine.com/t/toggle-visibility-on-a-3d-object-with-widget/465142 "2020-05-14T15:56:37Z")
So basically i want a button where when i press it is gonna toggle the visibility of three 3d objects. And i want all of this to be done on a widget. And also one more thing i want a back button where when i press it tog… --- ## [Bike Tour Open World](https://forums.unrealengine.com/t/bike-tour-open-world/2464285)
**Author:** [@shinma8](https://forums.unrealengine.com/u/shinma8)\ **Replies:** 0\ **Last updated:** [April 19, 2025, 8:34am UTC](https://forums.unrealengine.com/t/bike-tour-open-world/2464285 "2025-04-19T08:34:18Z")
CODE: 0269-0121-5748 I created and decorated all the background objects myself. --- ## [How can I set the same parameters for multiple Geometry Collections? ](https://forums.unrealengine.com/t/how-can-i-set-the-same-parameters-for-multiple-geometry-collections/2301110)
**Author:** [@chofuqiushan](https://forums.unrealengine.com/u/chofuqiushan)\ **Replies:** 9\ **Last updated:** [February 21, 2025, 5:57am UTC](https://forums.unrealengine.com/t/how-can-i-set-the-same-parameters-for-multiple-geometry-collections/2301110 "2025-02-21T05:57:35Z")
Hello community! I’m trying to make a game that uses a lot of Geometry Collections, but I’m running into a problem. I don’t know how to set the same parameters for multiple geometry collections. In particular, it is es… --- ## [Shortcut to teleport an object to the mouse cursor within the viewport](https://forums.unrealengine.com/t/shortcut-to-teleport-an-object-to-the-mouse-cursor-within-the-viewport/490862)
**Author:** [@NezamJinnah](https://forums.unrealengine.com/u/NezamJinnah)\ **Replies:** 2\ **Last updated:** [January 18, 2025, 6:14am UTC](https://forums.unrealengine.com/t/shortcut-to-teleport-an-object-to-the-mouse-cursor-within-the-viewport/490862 "2025-01-18T06:14:42Z")
As a game dev, we move many meshes, actors, etc, all over our 3D world on a daily basis. It would be nice to have a way to teleport a selected actor to the mouse cursor in our viewport using a shortcut like, Ctrl+T for e… --- ## [How do i get the velocity of an object hitting me?](https://forums.unrealengine.com/t/how-do-i-get-the-velocity-of-an-object-hitting-me/398769)
**Author:** [@ZvampAddict](https://forums.unrealengine.com/u/ZvampAddict)\ **Replies:** 3\ **Last updated:** [December 31, 2024, 4:20pm UTC](https://forums.unrealengine.com/t/how-do-i-get-the-velocity-of-an-object-hitting-me/398769 "2024-12-31T16:20:27Z")
So i am trying to make my character go ragdoll when i fall from a hight or get hit by a fast moving object. My idea was to use an event hit so whenever i hit the ground from falling or get hit by an object at a certain v… --- ## [How efficient is accessing data tables?](https://forums.unrealengine.com/t/how-efficient-is-accessing-data-tables/397308)
**Author:** [@Deamonpog](https://forums.unrealengine.com/u/Deamonpog)\ **Replies:** 16\ **Last updated:** [November 30, 2024, 12:06pm UTC](https://forums.unrealengine.com/t/how-efficient-is-accessing-data-tables/397308 "2024-11-30T12:06:57Z")
I would like to know how efficient it is to: Search for a data Get data by row name Is it O(1) or O(n) ? Do I have to manually cache Data Table in memory or will they be cached into memory at runtime? Imagine I have … --- ## [how to optimize many actors in scene](https://forums.unrealengine.com/t/how-to-optimize-many-actors-in-scene/461583)
**Author:** [@anonymous\_user\_4a318649](https://forums.unrealengine.com/u/anonymous_user_4a318649)\ **Replies:** 4\ **Last updated:** [November 7, 2024, 5:07am UTC](https://forums.unrealengine.com/t/how-to-optimize-many-actors-in-scene/461583 "2024-11-07T05:07:59Z")
Hello~ I am making a landscape using Marching Cube, But I faced a sharp drop in performance. At first, I was delaying vertex optimization, so I thought this was a problem. but after the optimization I had the same pro… --- ## [Sequencer: "Object bound to this track is missing"?](https://forums.unrealengine.com/t/sequencer-object-bound-to-this-track-is-missing/374226)
**Author:** [@uniconin](https://forums.unrealengine.com/u/uniconin)\ **Replies:** 31\ **Last updated:** [October 31, 2024, 11:52pm UTC](https://forums.unrealengine.com/t/sequencer-object-bound-to-this-track-is-missing/374226 "2024-10-31T23:52:20Z")
Hey Guys, we want to record a trailer for our upcoming game. When recording a gameplay sequence with the sequencer however, the weapon of our character is shown while playing but not in the replay or render. It states … --- ## [How to manually destroy a UObject?](https://forums.unrealengine.com/t/how-to-manually-destroy-a-uobject/384325)
**Author:** [@anonymous\_user\_1ed1c3df](https://forums.unrealengine.com/u/anonymous_user_1ed1c3df)\ **Replies:** 1\ **Last updated:** [September 17, 2024, 10:41pm UTC](https://forums.unrealengine.com/t/how-to-manually-destroy-a-uobject/384325 "2024-09-17T22:41:50Z")
I have a UObject class I’m using as a buff object with its own ticking functionality and etc. When a player overlaps with a pickup, its constructs the corresponding buff object and puts the reference in the player’s arra… --- ## [object makes me fly when on top of it](https://forums.unrealengine.com/t/object-makes-me-fly-when-on-top-of-it/2017080)
**Author:** [@lucagummy](https://forums.unrealengine.com/u/lucagummy)\ **Replies:** 1\ **Last updated:** [September 12, 2024, 5:09am UTC](https://forums.unrealengine.com/t/object-makes-me-fly-when-on-top-of-it/2017080 "2024-09-12T05:09:26Z")
Hello, i need help with a blueprint issue, i have watched a youtube video tutorial of how to make a object pickeable so i can use in my first person horror game but when i step up on the object and drag them they make me… --- ## [Passing an object vs passing variables within an object.](https://forums.unrealengine.com/t/passing-an-object-vs-passing-variables-within-an-object/2006089)
**Author:** [@turbotanaka](https://forums.unrealengine.com/u/turbotanaka)\ **Replies:** 2\ **Last updated:** [September 5, 2024, 8:13am UTC](https://forums.unrealengine.com/t/passing-an-object-vs-passing-variables-within-an-object/2006089 "2024-09-05T08:13:06Z")
I’m trying to change a variable within an object. Initially, I was planning to just get the variables from the object in advance and pass them down, but since I needed a reference to save them, I switched to passing the… --- ## [Rotate Grabbed objects while moving.](https://forums.unrealengine.com/t/rotate-grabbed-objects-while-moving/1991194)
**Author:** [@TheRegnaX](https://forums.unrealengine.com/u/TheRegnaX)\ **Replies:** 0\ **Last updated:** [August 25, 2024, 1:30pm UTC](https://forums.unrealengine.com/t/rotate-grabbed-objects-while-moving/1991194 "2024-08-25T13:30:29Z")
Hello guys. I am a foreigner and a bit new to this business. There have been posts on the topics I am looking for, but the videos explaining them have been deleted. So I will ask you to help me again on this issue. My bl… --- ## [Missing objects while packing in VR](https://forums.unrealengine.com/t/missing-objects-while-packing-in-vr/371762)
**Author:** [@anonymous\_user\_bac224d7](https://forums.unrealengine.com/u/anonymous_user_bac224d7)\ **Replies:** 11\ **Last updated:** [July 12, 2024, 6:06pm UTC](https://forums.unrealengine.com/t/missing-objects-while-packing-in-vr/371762 "2024-07-12T18:06:19Z")
After packaging project I lose 99% of all objects which must to be in the project. Why? How to fix this, because my VR project can’t be finished if I can’t use any objects. --- ## [How do I add a kill zvolume to a moving object?](https://forums.unrealengine.com/t/how-do-i-add-a-kill-zvolume-to-a-moving-object/347474)
**Author:** [@anonymous\_user\_b09ca9521](https://forums.unrealengine.com/u/anonymous_user_b09ca9521)\ **Replies:** 1\ **Last updated:** [March 29, 2018, 3:19am UTC](https://forums.unrealengine.com/t/how-do-i-add-a-kill-zvolume-to-a-moving-object/347474 "2018-03-29T03:19:11Z")
I know how to add a kill zvolume to a static object and have it kill the player when touched, but I have no idea how to do this with moving objects. --- ## [How do I export objects from FNV to UE4](https://forums.unrealengine.com/t/how-do-i-export-objects-from-fnv-to-ue4/355020)
**Author:** [@Medikleptic](https://forums.unrealengine.com/u/Medikleptic)\ **Replies:** 3\ **Last updated:** [May 27, 2024, 2:55pm UTC](https://forums.unrealengine.com/t/how-do-i-export-objects-from-fnv-to-ue4/355020 "2024-05-27T14:55:33Z")
Sorry if this sounds incredibly simple and noobish but I am extremely new to UE4. The most I know how to do is load up heightmaps and create objects. Anyways i’m trying to create a sort of Fallout New Vegas remake (a lot… --- ## [Snapping object to position on any surface under mouse in editor](https://forums.unrealengine.com/t/snapping-object-to-position-on-any-surface-under-mouse-in-editor/366283)
**Author:** [@piotrekb89](https://forums.unrealengine.com/u/piotrekb89)\ **Replies:** 7\ **Last updated:** [May 10, 2024, 2:15am UTC](https://forums.unrealengine.com/t/snapping-object-to-position-on-any-surface-under-mouse-in-editor/366283 "2024-05-10T02:15:16Z")
Hi, Is there any way to snap object to any surface (terrain, other object) which is under mouse in editor? I’m looking to same functionality the CryEngine have, look for example here http://worldofleveldesign.com/categ… --- ## [How can I create an array of objects within another object properly in Blueprints in Unreal Engine 5?](https://forums.unrealengine.com/t/how-can-i-create-an-array-of-objects-within-another-object-properly-in-blueprints-in-unreal-engine-5/1813047)
**Author:** [@Huyfrommount](https://forums.unrealengine.com/u/Huyfrommount)\ **Replies:** 0\ **Last updated:** [April 20, 2024, 8:07pm UTC](https://forums.unrealengine.com/t/how-can-i-create-an-array-of-objects-within-another-object-properly-in-blueprints-in-unreal-engine-5/1813047 "2024-04-20T20:07:11Z")
I’m encountering a particular issue. Let’s say we have a Car class and a Wheel class (both being separate classes as per my requirements). I associate wheels with cars, and in the editor, everything functions correctly; … --- ## [Align an Object to the Center of Another Object?](https://forums.unrealengine.com/t/align-an-object-to-the-center-of-another-object/394314)
**Author:** [@GamerUprise](https://forums.unrealengine.com/u/GamerUprise)\ **Replies:** 6\ **Last updated:** [April 7, 2024, 7:21am UTC](https://forums.unrealengine.com/t/align-an-object-to-the-center-of-another-object/394314 "2024-04-07T07:21:55Z")
I am trying to center the light source from the ceiling of my building to get rid of unnecessary reflections on the ceiling. The problem is the ceiling is a duplicate of the floor scaled (40, 40, 1), and I’m using 6 ligh… --- ## [I can't save my project because of a private object](https://forums.unrealengine.com/t/i-cant-save-my-project-because-of-a-private-object/1789388)
**Author:** [@Andre.Buzeli](https://forums.unrealengine.com/u/Andre.Buzeli)\ **Replies:** 0\ **Last updated:** [April 5, 2024, 2:40pm UTC](https://forums.unrealengine.com/t/i-cant-save-my-project-because-of-a-private-object/1789388 "2024-04-05T14:40:44Z")
I tried harvesting and making into a blueprint a structure that I exported from sketchup using datasmith , but when i do this , if the blueprint is in use in the project , it giver me the following error : Can’t save E:/… --- ## [AR -3D Object tracking](https://forums.unrealengine.com/t/ar-3d-object-tracking/768407)
**Author:** [@MeghaKK](https://forums.unrealengine.com/u/MeghaKK)\ **Replies:** 1\ **Last updated:** [April 3, 2024, 7:33am UTC](https://forums.unrealengine.com/t/ar-3d-object-tracking/768407 "2024-04-03T07:33:13Z")
Hi , I am looking to create a AR Application where the real world object is scanned it should be tracked in such a way where it is compared it to a virtual 3d model. They have to be on the exact same position. I have ch… [Next page](https://forums.unrealengine.com/tag/object/1377.md?match_all_tags=true&page=1&tags%5B%5D=object)