CODEWITHSUNDEEP
iosopengl-es-2.0augmented-reality
The Rock
The Rock

Reputation: 1

Augmented Reality, Move 3d model respective to device movement

I am working on augmented reality app. I have augmented a 3d model using open GL ES 2.0. Now, my problem is when I move device a 3d model should move according to device movement speed. Just like this app does : https://itunes.apple.com/us/app/augment/id506463171?l=en&ls=1&mt=8. I have used UIAccelerometer to achieve this. But, I am not able to do it. Should I use UIAccelerometer to achieve it or any other framework?

Upvotes: 0

Views: 1308

Answers (3)

Michal Karm Babacek
Michal Karm Babacek

Reputation: 424

  • I would definitely use Vuforia for this task.

  • Regarding your comment:

    I am using Vuforia framework to augment 3d model in native iOS. It's okay. But, I want to move 3d model when I move device. It is not provided in any sample code.

Well, it's not provided in any sample code, but that doesn't necessarily mean it's impossible or too difficult.

I would do it like this (working on Android, C++, but it must be very similar on iOS anyway):

  • locate your renderFrame function

  • simply do your translation before actual DrawElements:

    QCARUtils::translatePoseMatrix(xMOV, yMOV, zMOV, &modelViewProjectionScaled.data[0]);

    Where the data for the movement would be prepared by a function that reads them from the accelerometer as a time and acceleration...

What I actually find challenging is to find just the right calibration for a proper adjustment of the output from the sensor's API, which is a completely different and AR/Vuforia unrelated question. Here I guess you've got a huge advantage over Android devs regarding various devices...

Upvotes: 0

TheIT
TheIT

Reputation: 12219

From your comment am I to understand that you want to have the model anchored at a real world location? If so, then the easiest way to do it is by giving your model a GPS location and reading the devices' GPS location. There is actually a lot of research going into the subject of positional tracking, but for now GPS is your best (and likely only) option without going into advanced positional tracking solutions.

Seeing as I can't add comments due to my account being too new. I'll also add a warning not to try to position the device using the accelerometer data. You'll get far too much error due to the double integration of acceleration to position (See Indoor Positioning System based on Gyroscope and Accelerometer).

Upvotes: 1

Jingwei
Jingwei

Reputation: 755

It is complicated algorithm rather than just Accelerometer. You'd better use any third party frameworks, such as Vuforia, Metaio. That would save a lot of time.

Download and check a few samples apps. That is exactly what you want.

https://developer.vuforia.com/resources/sample-apps

You could use Unity3D to load your 3D model and export XCODE project. Or you could use open GL ES.

Upvotes: 2

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