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Close Target

October 17, 2011 - 7:53am #1

Hello everybody,

I have a small situation here.
I'm using the standard AR method on iOS and Android.

You see the marker with the camera and voila, a 3D model on the marker. Nicee

Now I'm using a marker with a size of 1,5 by 0,5 meters.
The only way for the 3D model to pop up, is by getting the whole marker in picture.
With such a big marker it's not really fun to do...

My question is:
Is it possible to let it recognize the marker sooner/closer instead of having to see the whole marker?

With kind regards,

Re: Close Target

October 19, 2011 - 6:25am #5

This sounds like a perfect use for a multi target. You can "stitch" those 9 image targets together in the config file to let QCAR know they belong to one big target. Then tracking should work smoothly as you look from one section to the next.

See the Multi Targets section of the Dev Guide for guidance on creating multi targets in the config.xml file. You should only have to manipulate the translation for each part, as they all sit in the same plane. Since you're using Unity, you'll be able to see the changes in the scene as you make changes to the config file (drag out a MultiTarget prefab first).

- Kim

Re: Close Target

October 18, 2011 - 11:52pm #4

I forgot to mention:
I've also split the huge image target up into 9 separate image targets who together form the 0,5 by 1,5 image target.

That works pretty good, but every time it switches from marker, he reloads the 3D model. So you get a 'frame drop'.

Maybe there's a way to skip the reloading part and just uses the marker data to keep the same 3D model in position?

Re: Close Target

October 18, 2011 - 11:45pm #3

Hello Kim,

It's already an image target.
I printed out one huge image of 1,5m by 0,5m.
This image is used in Unity as a image target.

But also the image target needs to be fully visible in the screen before recognizing the image.
But when it does recognizes it, you can view it closer up a lot. And when you accidentally look away from the marker, you have to walk back and get the whole image in screen again before it recognizes it.

That part of having to get the marker/print fully in screen is what I want to skip somehow.

Is there someway to let it recognize a marker without having to see all of the markerpoints? Or with at least less?

I hope I made my point clearer now ;)

Re: Close Target

October 18, 2011 - 11:46am #2

This is possible with image targets, but currently frame markers must be completely visible to be tracked. Have you tried using an image target?

- Kim

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