Unity3d with AR Foundation - How to Place Different Prefabs With AR Plane Detection?

Few subscribers asked me if I could make a new video about placing different prefabs with AR Foundation, today I am releasing such video where I walk you through creating an UI feature that includes 3 different buttons, each button is assigned to a specific prefab, once the user selects a button the prefab used for instantiation gets changed which gives the user the ability to place different prefabs in planes detected.
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[@saetbyeolkwon4602]

Thanks a lot!! Your tutorials are always helpful.

[@dilmerv]

You are very welcome and if there is anything I don’t cover yet let me know :) have a great day !

[@saetbyeolkwon4602]

I'm getting some errors tho...

[@dilmerv]

Saetbyeol Kwon what errors ?

[@saetbyeolkwon4602]

it says the prefab cannot be loaded. I've checked the name of my prefabs several times and it's exactly same.

[@dilmerv]

Saetbyeol Kwon are you using my GitHub repository ? Also did you place the prefabs inside of the Resources folder with a sub folder called “Prefabs”?

[@adiwijayakusuma2288]

Hi Dilmer, im just discover your channel. Thanks for the AR Foundation tutorials. Can i ask you ? Why there are no application test in the end of video?

[@vmmi8215]

My sensei, me as your loyal disciple come for your lesson as always

[@dilmerv]

Hehe you are more than welcome and thanks for your cool feedback and for watching my videos :) my student !

[@buildar8434]

Hey, great stuff. I wanted to ask how to change the prefabs of previously generated planes. I have been able to change prefab for new planes. But how to change for previously generated planes ?

[@WarPigAUT]

Hey Dilmer, I really really enjoy watching your videos. You already helped me out a lot and i will share your videos and suggest them to everyone who is in this topic. Really good explanations and easy to understand for beginners in unity. But i got another question about unity: is it possible to load a prefab via the device filesystem? Like a fileupload in HTML? Or if this is not possible, is it possible to load a ressource via an external URL like a google drive link, dropbox or an API? Best regards

[@dilmerv]

Thank you for your nice message and yes it can be done, for now I am just going to give you a URL as a reference but I will make a video about it very soon :) docs.unity3d.com/Manual/UnityWebRequest-DownloadingAssetBundle.html

[@carlosfelipepuerta995]

I got a IOS AR foundation problem and I figure you may have an answer. I got an AR Foundation app that does ground placement of some models. However for Android I place Objects and regardless of the direction im looking the models face the intended direction (towards the player), but for iphone the models rotation depends on the direction im looking at and may end up rotating in the wrong direction. Any idea what I could do to alliveate this without writing custom code for IOS, ( I know it wouldnt be much but still)

[@All_About_Portfolio]

I really enjoy your videos Dilmer! Can u make a video on AR shooting game.. like spawning enemy around..!

[@dilmerv]

Thank you 🙏 and I will definitely consider your suggestion !

[@pranjalshah7985]

Hey this is great video and you make nice tutorials.. I am working on ar ring try-on project so can you help me with how can I achieve hand tracking and rotation in ar without any hardware. Thank you

[@dilmerv]

Hey man not sure what you mean without hardware? Can you explain what your setup would look like?

[@pranjalshah7985]

@@dilmerv I am trying to do it with mobile application. And by without hardware I meant without external hardware like intel real sense or external camera.

[@pranjalshah7985]

great video tutorial.. just a question How can I destroy all other objects and spawn only one model on button click?

[@dilmerv]

Take a look at all the examples in my GitHub repo and you can modify them to fit your needs github.com/dilmerv/UnityARFoundationEssentials

[@pranjalshah7985]

@@dilmerv Thanks buddy.. But How can I destroy the initiated object.. I tried gameobject.SetActive(false); but it didn't respond can you help me with that.

[@saetbyeolkwon4602]

Hi Dilmer! One more question. How can I remove the prefabs I've instantiated when I click another button? If I touch "Set ARBlue" then touch "ARGreen", can ARBlue prefab be removed automatically?

[@dilmerv]

You can do a Physics.Raycast and use the hit object to determine which object needs to be removed.

[@franciscocriscuolo6350]

Nice Dilmer! Just a question... The new AR Foudation 3.0 can recognize face expressions to trigger events? You have a video for arkit but not for android. Its the same?

[@dilmerv]

Yes it can with few additions of code :) I will do a video about it soon ! Thanks for watching !

[@franciscocriscuolo6350]

@@dilmerv Nice! im looking forward that video and the one with the cloud anchor! Keep the good work!

[@dilmerv]

Thank you !

[@elif-du2mf]

What is the game object called the plane visualizer? ı made the game and the buttons are functioning but no prefabs are spawned :(

[@dilmerv]

I recommend checking out this repo as some of the newer components are available here and it also provides a lot of examples: github.com/Unity-Technologies/arfoundation-samples

[@elif-du2mf]

@@dilmerv thank you so much for taking the time to reply all my frustrated messages ❤️ Im figuring it out slowly and ur videos are super helpful 🙏

[@stevejhon9957]

Hi master, just one question, how to spawn just one prefabs and when click another button the previous prefabs got remove?? I see all example in your github but when i try it didn't work, sorry im new at this... Thank you for tutorial and sample 🙏

[@dilmerv]

You could either destroy the previous object or you can check if the placement object already exist and not instantiate a new one.

[@dilmerv]

You are welcome :)

[@stevejhon9957]

@@dilmerv okay master, i will try and search again, thank you very much, have a good day master!

[@slavhtrup4327]

Hi, first to say - great work. Since I am new to AR I am trying to follow your tutorials from UnityARFoundationEssentials but I am getting those error when I try to build for Android: Failed to generated ARCore reference image library 'ReferenceImageLibrary' BuildFailedException: Failed to generate image database. Output from arcoreimg: stdout: ==== stderr: C:\Users\Slavy\AppData\Local\Temp\26b309eb32bf4fb4a43c1f023a87a4e5\c377c4cd2e374c5bbdec4fc2279558a3.txt:line 4: Not supported image format: Assets/ImageLibraryAssets/cardgym.JPG. ==== I get those errors on any scene ( ImageTracking ). What am I missing ?

[@dilmerv]

Hello and thank you for your message, can you tell me which scene you are building ? I have a few in that project about image tracking.

[@slavhtrup4327]

I am shure I am doing something stupid ... but here are my steps. Unpack UnityARFoundationEssentials-master; Load it in Unity3d 2019.2.6; Change Buidsetting to Android; remove Vulcan API; Load scene ImageTracking from Scenes folder. Build and Run - and there are those errors. When i try deferent scenes - same errors. I even removed all scenes in "Scenes In Build" exept loaded scene.

[@aihoang2881]

@@slavhtrup4327 some imge is cardgym.JPG -> cardgym.jpg and change unitywhite.png by different image