Use the target tracker in Meta Spark Studio to trigger an effect when the camera is pointed at an image in the real world, like a poster for a movie.
Start by adding a target tracker:
It’ll be listed in the Scene panel. You’ll also see a square in the middle of the Viewport and Simulator. This square represents the space for the target image:
Add the target image
This is a texture representing the real life image that will trigger the effect. It's a good idea to take a look these best practices to help choose an image that will work well.
To add the target image:
You'll see the texture appear in the Viewport.
Adding the effect that will be triggered by the target
To add the effect you want to trigger when the camera is pointed at the target, add the objects you want to appear as a child of the target tracker.
Target tracking effects can either stay in the place where the camera first detected the target image, or move with the target image as it changes position.
To choose one of these options, select the target tracker in the Scene panel and edit the Target Type setting in the Inspector. There are 2 options to choose from - Fixed or Moving.
The effect will appear at the point where the target image was first detected by the camera. If the target leaves the camera's view, the effect will still be displayed and tracked correctly. The target must stay in a fixed position to get the best results. If the target is moved or removed, tracking may be disrupted.
To further improve tracking when your target is not in view of the camera, you should encourage users to move their camera around the target for a short period of time before the target goes out of camera view.
The effect will move with the target image if the target image changes position. If the camera isn’t pointing at the target, the effect will disappear.
Previously, fixed and moving target trackers were two separate object types. The new target tracker performs measurably better than the older versions, so it's recommended that you update your existing tracking effects. To update effects created with previous versions of the target tracker, open your project file in the latest version of Meta Spark Studio and re-publish your effect.
When the target tracker is selected in the Scene panel you can view and edit its properties in the Inspector.
Set which layer the target tracker is assigned to.
When this box is checked, the target tracker is visible in the effect.
Add the texture that will trigger the effect.
Change the position, scale or rotation of the target.
Set whether the target tracker works through the front or back camera, before the effect is captured or during capture.
Create simple patch graphs to represent the target tracker.
To create a patch representing the target tracker to use in the Patch Editor, drag the target tracker from the Scene panel into the Patch Editor.
A series of 3 patches will be created: