Creator Forum

Sorry, first time building in MH. I've been trying to integrate an explosion from the public assets library (one of those PopcornFX asset types), but I haven't found out a way to start and stop playback of the particle effect from code.Casting to a ParticleGizmo obviously doesn't work, and the play() method doesn't resolve. I'm assuming under-the-hood it's an external Unity asset using a sprite sheet. I haven't found any documentation on this.How do I sent playback events to it?Thanks a lot!!

Since this morning, I’ve been getting the following issue: "Something went wrong, please restart the application or try again"I can't open, edit, or publish my worlds.I posted about it on Discord but haven’t gotten any replies, so I’m hoping someone here can help.We’re just hours away from the end of the competition, and I can’t leave my game in the state it should be in.The issue happened after exiting the editing mode of a world.I’m leaving a video so you can see — honestly, it’s really frustrating as a creator to have this happen on the last day of the competition with things still left to finish. 

I have a world where the sightline is quite far. Players are able to see a black lined square at the bottom edge of the world. See screenshot. I've tried turning off `Environment > Show Grid` already but that doesn't help since this isn't a grid. This is something else.How do I turn this square off? It's really jarring and doesn't fit within the world I'm building at all.

PSA: If Text Gizmo is not updating by typescript, try toggling visibility

I just noticed that there is no audio when recording using iOS system, is there another way to record game play video on Horizon mobile app? 

Does NPC NavMesh Locomotion work with the new avatar NPCs or only the old skeleton ones?

Visible to public greyed out?

 Best way to report documentation errors?for example PropsDefiniition is now PropsFromDefinitions etc in https://developers.meta.com/horizon-worlds/learn/documentation/desktop-editor/npcs/navigation-mesh-generation and others 

guys, this is toasted or wat  

Sublevel is extremely buggy... Are there coordinate limits for alignment to the current world? 

many doc comment updates that "Horizon Worlds" is now "Meta Horizon Worlds", as well as other minor doc comments new WorldInventory static class to simplify IWP management w/o an IWPSellerGizmo getPlayerEntitlements() - all the IWPs a player has purchased getWorldPurchasableBySKUs() - look up IWP items by string name (Stock Keeping Unit aka SKU)doesPlayerHaveEntitlement() - see if a player owns a speciifc IWP, by SKU new InWorldPurchasable type and PlayerEntitlement interface to work with new WorldInventory api new InWorldPurchase.launchCheckoutFlow() static method so that you can initiate IWP purchases without an IWPSellerGizmo, i.e. directly from Custom UI!

How to upload a transparent texture and have it display on a plane with transparency?

So I kept trying this.entity.rotation.set(.... fromEuler()..) in OnGrabStart, but for some reason the rotation is never updated? 

Invalid interaction choice in set interaction?

Is it possible to build a mobile chess game, where fine raycasts are required (not just the bad aim the examples show - at least so far, i can't seem to properly raycast with any of the gun examples)Can we do a direct raycast from finger position on the screen? 

How to have NPCs not collide over overlap each other when all headed to same destination? 

Can NPCs be identified with tags?

NPC Audio - do their mouths lipsync or is it just an AudioGizmo????! Kind of disappointed that OVR has had lipsync support for 10+ years and that's not reflected her 😕 

Hi!I'm regularly getting an issue that leaves all my assets in Horizon Worlds missing, showing up as exclamation marks. This will happen and be present for a couples days, even after restarting my computer. The same thing will even show up in other worlds on my headset while this is going on, and seems like it's maybe linked to my account.Is there a workaround anyone has found for this issue, perhaps a way to clear the cache or avoid apparently requesting missing assets?The issue from my application logs:2025-04-30 13:45:26Z 46336 I [standaloneassetmanager::fetchassetsutility] Request 1546188227331 for asset versions: 9140429309385770, 93351164798677252025-04-30 13:45:26Z 46346 W [settings] AssetGraphQL: Failed to retrieve assets. Query name xfb_social_vr_asset_by_id. Response body: {"errors":[{"message":"Rate limit exceeded","severity":"CRITICAL","code":1675004}],"extensions":{"is_final":true}}.2025-04-30 13:45:26Z 46346 W [standaloneassetmanager::fetchassetscallbacks] Null asset hand

I've never had a problem publishing my worlds and suddenly the Rating system is not set any more and I cannot publish, even for nonsearchable worlds.The contest deadline is tomorrow. Really concerned about this.

 Restarting did not help. 😕 I don't think I am near the rate limits but there have been both bad/useless and failed gen's so not sure if those count

Beste mede bouwers ik heb een brutale vraag Ik ben hard op zoek naar een asset van een koe voor in mijn wereld Ik ben namelijk een wereld aan het bouwen met een hollandse molen Tulpen , kippen enz maar daar hoort ook een koe bij alleen kan ik die nergens vinden Ik probeerde hem via internet te downloaden en om te zetten via blender (tot vervelens toe ) , maar ik kom er niet uitDus mijn vraag, wie kan dit voor mij of heeft er een koe voor mijn wereld ? Ps mijn wereld heet Holland plaza.Alvast hartelijk dank Herman

for mesh export it seems there is no longer a FBXExport folder after the new update? Where are the mesh exports now saved to? https://developers.meta.com/horizon-worlds/learn/documentation/desktop-editor/assets/asset-export-to-fbx-file 

Yesterday evening i came out of one of my worlds and came back in and noticed that the top navigation to the desktop editor is continuously failing to load. I'm noticing this across all of my worlds and with the standalone editor and the one attached to the Meta Quest Link app.   As you can see below, the rest of the editor loads except the top panel, and yes, I've hit the retry button about 50 million times. I'm still seeing content fail to load on the latest build - I'm pretty sure this desktop editor hates me and this is its revenge for filing so many bugs 😭 Just posting this for awareness and seeking workarounds since I'm unable to edit/publish my world now for the competition.