Endresult
Prerequisites
To get this awesome app up and running, you'll need to have the following:- Vuforia Unity Extension (Free). Currently 2.8.7 is the latest version.
- Unity (Free).
- Apple Developer account ($99 / year).
- Xcode (Free)
- Physical iOS device (not emulator), like an iPad.
- A 3d model to render, supported by Unity. I'll be using Yoshimitsu from Tekken Tag Tournament.
- A target image. This is the image we'll be scanning, so it needs to be printed on paper as well. For this tutorial, I'll be using one of my older textures.
Target manager
After everything is installed and set up, you'll need to go to the Target Manager from Vuforia. We'll be uploading the target image here. Make sure you'll select an image that has a high feature amount of features. The target manager will help you though.Create a database, give it a name and add a target. I used the following settings:
After the upload is complete, Vuforia will check how augmentable the
image is by giving it a star rating. Your goal will be to use images
that have a high star rating, and some image enhancement tricks might help. Select the target in Vuforia and click the "Download Selected Targets"-button.
Select Unity Editor in the pop-up that follows, which will allow you to download a .unitypackage file with your target. Save this file on your disk.
Unity: Project start
The next step is to start up Unity. Create a new (empty) project on a selected location. When the project is loaded, delete the Main Camera in your Hierarchy to start with a clean plate. We now need to import the Vuforia .unitypackage files (both the SDK and the image target).
After your import is done, your Project should look like this.
To complete this step, it's useful to directly load the model that we
want to show in our augmented reality world. In my opinion, this is the
easiest way:- Right-click the Assets-folder in the Project
- Select "Reveal in Finder" (Probably "Reveal in Explorer" on a Windows machine)
- Open the Assets-folder
- Create a new folder named Models (or any other, logical name)
- Place the model (incl. all the textures etc.) inside thie folder
- Go back to Unity
Now that we have everything complete in Unity, we can start building our world!
Unity: Build the augmented reality world
On to the most fun part of this tutorial - actually creating your AR
world! First, we'll need to do the following: In your Project windows,
open the Assets/Qualcomm Augmented Reality/Prefabs-folder. In here,
you'll find the ARCamera. Drag it into your Scene. With
the ARCamera still selected, scroll down in the Inspector and make sure
you Load the Data Set with your Database (the Image Target), and set it
to Active as well.
From that same Prefabs-folder, drag an Image Target to the scene.
With the Image Target still selected, scroll down in the Inspector and
set your Data Set (Database name) as well as your Image Target. Your
Image Target should now be visible (you might need to scroll in order to
zoom in/out).
Now, we'll need to add the model to the Image Target. Simply drag the
model that you added in your Assets-folder to the scene. In your
Hierarchy, make sure the model is under the Image Target. You
might want to change the position of the model, change the values of the
Scale / Rotation (inside the inspector) to get it into the right place.
This might need some experience with the program, but once you got the
hang of it, it's pretty simple.
From here on, it actually is your own creativity that can do all the
work! Add more models to the scene (trees for example) to get an even
cooler world. Just some tips:- Add some light to your models by going to GameObject > Create Other > Directional Light. This way, you can create a light source to light up your model.
- Make sure the models are placed under the Target Image in the Hierarchy.
- When using multiple image targets, make sure you set the correct amount of image targets inside the ARCamera (Inspector > Max Simultaneous Image Targets).
Deployment
Now to get this thing into your iPad. I assume that you already have
some knowledge about iOS development (since you already got your
license), you'll need to know your App Identifier (since that will be
used as your Bundle ID). Inside Unity, go to File > Build Settings.
If your scene isn't in the current build, press the "Add Current"-button. Now select iOS as Platform, and go to Player Settings...The inspector will show up, and you can leave most of the settings to it's default value (for now). The only thing you'll need to change is the Bundle Identifier (found under Other Settings). Set this to the one you've created in the Apple Developer Center, and you're done!
Connect your iOS device and press Build and Run. Wait a while; Unity will now kick up XCode and deploy the application to your device. When it's loaded, it should start automatically and you're ready to scan your printed image target. Have fun!
Conclusion
When I first tried Vuforia, I went ahead and started using the native iOS SDK.
The learning curve was way to steep for me, since I'm not an
Objective-C programmer, but especially have since I have no knowledge
about OpenGL ES
(that allows the 3d rendering). With the help of their awesome Unity
plugin, it allows a low entry level into the world of Augmented Reality.This tutorial was a pretty basic tutorial, just to get you up and running. If you want, you can also get more details in the official Getting Started guide. Using Unity, we can also script some awesome things inside the game, which I might be able to show you next time. So, what about you? Are you going to try this sometime? Or do you have any other insights? Let me know.
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