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Specific Target World Position + Device Tracking

June 29, 2016 - 5:39am #1

I'll try to be as specific as possible.

For an AR game we are developing we would like to have the tracking as smooth as possible.
We expect people to move their device so close to the marker that the tracker will not be able to recognize the marker any more.

We would like the user to be able to do it without losing the tracked object.
I have tried extended tracking, but even with that it loses the object.

Apart from tracking it is also important that the positioning is as accurate as possible. The marker has some visual clues for the gameobject that would be shown there. Kind of like in a boardgame, if the board is the marker and the player-icons/avatars are gameobjects.

I tried to set the marker as the world center. That works, but it doesn't work together with device tracking.

I would like to make some sort of combination. Using/Resetting the world center to the marker, while switching to just device tracking when it is not able to find the marker. So whenever the marker is visible it is accurate, but when it is lost  it would still be possible to see the object from different angles.

I hope that makes it somewhat clear.

How should I accomplish this?

To me it sounds like something that should already be implemented in the plugin. Did I miss something?

Specific Target World Position + Device Tracking

June 29, 2016 - 8:50am #2


extended tracking is as close as you get.

You can only switch to ROTATIONAL_HANDHELD_AR (Handheld AR use case plus device tracking with a handheld rotational model) mode (using MixedRealityController), but if imageTarget is lost, only rotation of the device is tracked, not the position. (Use ROTATIONAL_VIEWER_AR if using in googles) See https://developer.vuforia.com/library/sites/default/api/unity/classVuforia_1_1MixedRealityController.html

You can try to add more features on your imageTarget, so it always has some features available to track. Maybe using Quality mode in ar camera will help a little, at cost of performance.

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