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Render a big 3D Object with a small image target

July 15, 2013 - 7:41am #1

Hi everyone,

I need to render a big object on an image target. I need to be around 6 meters away from the image target to show my object entirely but from 3meters it starts to shake and around 6meters it disappears as my image target is too far.

Do you have any solution about how I should do to improve my target recognition and how to avoid/reduce the shaking ?

Thanks !

Render a big 3D Object with a small image target

February 20, 2016 - 3:00am #10

Okay, my problem solved. You can access the inspector of ARCamera->Camera->Clipping Planes to set near and far. 

Render a big 3D Object with a small image target

February 20, 2016 - 2:53am #9

Hi, 

Facing similar problem. Anyone has any solution yet?

Here is a post in 2012. https://developer.vuforia.com/forum/qcar-api/when-i-zoom-out-3d-object-disappear

Being a newbie, I don't know if it works anymore or how Render:setARProjection should be used.

Can anyone help? thanks!

 

Render a big 3D Object with a small image target

May 30, 2014 - 4:43am #8

Hi
I have this problem too and I can't increase my image target size and can't use multi targets too. You wrote about a way to employ dead reckoning to ... . can you explain it? thank you.

Render a big 3D Object with a small image target

July 18, 2013 - 8:58am #7

Have you evaluated the use of a MultiTarget? This would enable you to define a target that has elements both on the wall and floor, and could support a greater range of perspectives.

My advice is to use a larger target image if at all possible, perhaps by combining the A4 prints. As a rule of thumb, the maximum reliable tracking distance is approximately 4 to 5 times the diagonal length of the target image. Also tracking quality tends to degrade as you move the model further from the center of the target - so having the model positioned high above the target may be a problem.

In these cases, it's best to experiment to determine what size and configuration of targets works best.

Render a big 3D Object with a small image target

July 18, 2013 - 12:32am #6

Any idea on how to do that ? 

Render a big 3D Object with a small image target

July 16, 2013 - 1:08am #5

Ok, thanks for confirming that. 

 

Well, my app is supposed to show suspended-chimney in rooms so the client can see how it'll look like before buying one. 

For now I was fixing the image target on a wall and then rendering the object between the target and me.

What I was thinking is to put the target on the ground, behind the place where the chimney will be suspended and then once the object is renderred, forget about the image target and let the object in the space so I can move anywhere with my iPad and see it even if the image target is out of the camera. Is that what you're calling dead reckoning ? If yes I think this is what I need !

Do you have any advices on how to do that ? Or any code samples ? 

 

(I think you've already realized but I'm not english so.. sorry if I'm not always understandable)

Render a big 3D Object with a small image target

July 15, 2013 - 10:19am #4

You're necessarily working w/ a limited distance then.

What are your requirements? Can you use the target to identify the context and then employ dead reckoning to infer an approximate position based on accelerometer and compass data?

Render a big 3D Object with a small image target

July 15, 2013 - 8:35am #3

That's in fact a part of my problem, the target has to be a A4 paper, it can't be larger.

I found that topic this morning but wasn't really helping as I'm really far from the target :

https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/filter-camera-position-and-rotation-avoid-jitter

Render a big 3D Object with a small image target

July 15, 2013 - 7:49am #2

You'll most likely need a larger target, or to use a flat MultiTarget. The shaking indicates that the apparent features of the target aren't sufficient to stabilize tracking at those distances.

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