Develop Reference

ARCore 3D object display

I am a complete beginner with ARCore and I would like to ask if it is possible to display 3D objects using 3D coordinates and having the user as the origin? For example, having (x,y,z) values of (0,3,0) will display the 3D object to the right of the user.

First of all: There is no native implementation in ARCore for that!.
But you're not completely lost. There are some very useful libraries in Android like appoly. I've used this fork from Eric Neidhardt.
For iOS I only know this library based on ARKit.
You can also make a Unity3D app in C# and use AR Foundation and Vuforia Plug-in. This way is platform-independent, but imho testing is a pain.
You see, there are a few options out there, but be careful that none is really accurate!

How can I use LibGDX with AR library

I need to implement location based app with augmented reality. I draw a model with simple interaction with it (that's why I've chosen LibGDX) and I need to place this model on some point at the real world.
My small research gave me some solutions (like this or this). But all of them use marker-based drawing, but I need to draw model on surface.
Could anyone help me?

Person from Google has made some effort with ARCore using Libgdx, and had created a blog:
Investigating ARCore with LibGDX
Take a look at BaseARCoreActivity, which we can use to show some 3D Modle defined in Libgdx.

Are there simple AR SDK that does not use image recognition?

I'm looking for a 'basic' AR SDK that allows me to draw images and 3D shapes around the user (no matter where he is). It would be even better if the SDK includes a simple way to detect interaction with the shapes (something like onClick).
I made a project from scratch on Android but there's still a lot of work to do and I'll need to do the same on iOS after... So that's why I'm looking for an SDK or a similar project (no matter what platform).
I tested Metaio but it's quite expensive and maybe overkill for my purpose because it uses LLA coordinates.
I tested DroidAR on Android but it's only for Android and it looks heavy too (don't need the GPS).

How about Qualcomm's Vuforia? I was able to quickly get a sample project running on it.
EDIT Looks like I was wrong about what it could do. According to this (which is slightly dated, so who knows) Metaio might be your only choice.

i really don't sure what you really want to do ..but if you simply show images or 3d models on camera without any detection you can achieve this very easily i am explaining for Android and you can extend it to ios on same logic.
first approach:
you have to use custom camera of Android in your app,then use any game engine as per your need..i will suggest Jpct-ae or Rajawali
they are very simple to integrate and can be used for 2d images and 3d models.
this tutorial will explains a lot
keep the gl-surafce transparent and you can have model floating in space ...
second approach :
to add some more effect to your AR app you can use sensor values to move model in 3d space as per movement of device..it gives a cool effect.
use first approach and additionally collect sensor values and apply that matrix to gl camera of your game engine..for sensor values follow here
good tutorial here..
i hope this may help you..i done these a long time ago but try to help if you want..

Augmented Reality framework for sending to a video

I am new to Augmented Reality, and I was wondering if there was already an existing Framework available for my situation. I want to make an App that scans a non coded image (bottle, pen, phone etc.), and based on the image, sends the user to a specific video.
Is there anything like this currently available? I think this would be more marker based, but I am not entirely sure. Thanks in advance!

I have used this in my app. I found it pretty easy and it did good work in my app. Its Motorola's augmented reality framework.

You should use this if you only want a video to show up when an image is tracked: https://dev.metaio.com/creator/getting-started/
you just drag the video you want over the image you want to trigger it and then deploy it.
If you'd prefer to actually code it within a framework, you can try the metaio sdk, which also allows you use 3D objects for tracking-- i.e you said track an image of a pen, but why not track the pen itself? Tutorials and more info here:
metaio sdk tutorial: https://dev.metaio.com/sdk/getting-started/
3D object tracking tool: https://dev.metaio.com/toolbox/

Is there a Framework that recognizes a 3D image and send to a video?

Is there an android Framework that can be used in an app to recognize a 3D image and send the user to a video. This should fall under augmented reality, but so far everything I have viewed uses 2D image and stuff to produce a 3D image on the screen... My situation is backwards from that. I tried using vuforia but I couldn't get the sdk to work, and unity needs an android license. DroidAr doesn't seem to fit the bill either. Or are there any tutorials on this matter? Thanks.

I have not used the feature, but Metaio has a 3D object, "markerless" tracking feature as well as the ability to do video playback within the SDK. I am sure if you would rather simply redirect to a video (YouTube) or something this would not be exceptionally difficult.
http://www.metaio.com/software/mobile-sdk/features/
Metaio's mobile SDK is similar to Vuforia, so if you had trouble with that you might have difficulty getting it up and running. If your programming skills aren't up to that, you might consider looking into Junaio, an AR browser made by Metaio. With Junaio you simply create a content channel rather than having to build the app from scratch. Again, I have not actually tried this feature yet but the documentation seems to indicate that 3D tracking is available in Juniao:
http://www.junaio.com/develop/quickstart/3d-tracking-and-junaio/
Good luck!