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Ground Plane Augmentation Drifting or Jittering

February 9, 2018 - 1:14pm #1

Hi folks,

I have created an AR experience in Unity using Vuforia 7 and it's ground plane features. I have been able to place the object in the camera view where I want it, but as I move the iPad around, the object sometimes stays put and seems anchored in place, but other times it will drift and move along with me as I move, or it becomes shaky/jittery. Is there any way to improve this?

In addition, it looks like the object is not sitting flat or the perspective is wrong. If I look at horizontal lines in the background, the horizontal lines at the top of the object are not parallel to those lines but they should be.

The experience was created in Unity 2017.3.0p3 and is being run on an iPad Air 2 with iOS 11.2.

Thank you for your time.

Glen

Ground Plane Augmentation Drifting or Jittering

February 12, 2018 - 3:26pm #4

You can private message me a video/screenshot of what you are experiencing if you are not comfortable sharing it publicly.

Thanks,

Vuforia Support

Ground Plane Augmentation Drifting or Jittering

February 12, 2018 - 12:44pm #3

Is there someone I can send a link to the files showing the screen captures of what we are experiencing?

Ground Plane Augmentation Drifting or Jittering

February 9, 2018 - 4:18pm #2

Hello Glen,

Due to the nature of the technology, Ground Plane may not be able to provide 6DoF tracking in all environments. This article includes some information for an ideal Ground Plane environment: https://library.vuforia.com/articles/Training/ground-plane-guide.html



Specifically, the following is relevant to this issue:

Ground Plane utilizes images from the device camera to understand the basic geometry of your environment. Therefore it is necessary to stage Ground Plane experiences in settings that enable the camera to accurately capture the details of the surroundings.

Recommendations:

• Stable lighting conditions

• Moderate lighting - not too bright or too dark

• Avoid glare and dark shadows

• Surface details help to reveal geometry and improve accuracy and performance





Doing my own experiments, I found that in areas with low detail surfaces I was able to improve the experience by taking additional time to scan the environment before performing the first hit test. While not guaranteed to work, I was able to 6DoF/positional tracking in a wide variety of environments such as low detail carpet, tiles, and pavement.



The basic thought is that the more information the system has from environment scanning (floors, table tops, etc.), the more likely you are to gain a 6DoF pose.



The Ground Plane feature will continue to improve with future Vuforia releases. APIs that provide information on the tracking quality are coming in the future. These can be used to determine the quality of the area you are scanning and allow you to advise the user of what steps they can take to improve their experience.

Thanks,

Vuforia Support

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