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Creating trackables

September 25, 2011 - 10:27am #1

Hello,

I'm having a couple of problems with creating Single-Image Image Targets.

First:

When I am downloading a package that has a large number of trackables (> 80) and put it into an app, sometimes it doesn't recognise some of the last two or three image targets. If I deselect some of the other targets and redownload the package it starts recognising them again.

Deleting and re-uploading the images hasn't helped either. The only way that has worked for me is creating a new project and re-uploading all 80+ targets, then it starts working on all of them.

All my images are PNGs.

Second problem:

When creating a trackable that is in portrait mode and I enter in the "Width" field the width, the resulting config file put the Width field in the height and scales the width down.

e.g. I have an image that is 596x800 px
When creating the target I enter width as 596.
When the config.xml file is created it has it as:

Then I have to change it manually myself. I haven't tried, but I'm guessing that if I put the width as 800 I will get the right dimensions in the config file.

Thanks for your help!

Edit: I couldn't find the creating trackables board in the "AR Developer Forums" so I posted it here.

Re: Creating trackables

September 27, 2011 - 2:04pm #4

This is a runtime limit on how many features can be stored and processed.

Quote:

I've also noticed that if I put in 2 images that are similar to eachother (about 90+ % similar) as part of a large package I get an error message saying something like "Error downloading trackables...", when I remove one of them it works fine.

Thanks for the report, we'll look into this. Can you possibly send the two target images to

?

- Kim

Re: Creating trackables

September 26, 2011 - 5:27pm #3

Hey Kim,

Thank you for your reply! Out of curiosity is this a hard limit set when creating the trackable files or is the limitation in the tracker that's part of the application?

P.S. Sometimes I can get over 100 images targets in the system working, depending on the images. I've also noticed that if I put in 2 images that are similar to eachother (about 90+ % similar) as part of a large package I get an error message saying something like "Error downloading trackables...", when I remove one of them it works fine.

Re: Creating trackables

September 26, 2011 - 3:29pm #2

The tracker can currently only handle about 50+ images, depending on how feature-dense they are. We will be increasing this limit in future versions.

Thanks for the bug report on the portrait image handling, we will fix this!

- Kim

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