Q: What is a trigger image experience?
Trigger images, or targets, are images that launch an AR experience
The camera can recognize and lock onto a specific 2D trigger image in the real-world - such as a magazine cover, poster, or billboard. The camera can then attach the computer imagery to this trigger image so that the artificial appears to be a part of the real camera view.
The experience lasts for as long as the image is in the camera’s view.
Q: What makes a good trigger image?
For optimal object recognition and trackability, ensure that the selected trigger image:
- Displays rich color contrast.
- Has sharp edges and high contrast (e.g. text).
- Avoids repetitive patterns/motifs or strong rotational symmetry that can hinder detection.
- Is not flexible. Recommended materials include stiff materials such as card stock, plastic, or paper fixed to a non-flexible surface.
- Is not bent, coiled up, creased or wrinkled.
- Is matte, not glossy or reflective. Glossy/reflective surfaces may interfere with AR Designer’s ability to detect the image.
- Is evenly lit and viewed under moderately bright and diffuse lighting.
For more information, see our FAQ here.
Q: Which formats can be used for the trigger image?
To build a trigger image experience, you must upload JPG or PNG version of the real-world image you want to use.
- Resolution: At least 640x480 (480p), with a minimum of 72 dpi.
- Maximum size: 10-megabyte (MB) file
- Dimensions: Regardless of the image file resolution, real-world triggers can range from the size of a business card to that of a billboard, as long as it can it appears clearly on the user's mobile camera.
Q: What do the Trigger Strength ratings mean?
- Strong - Provides the greatest viewing experience. Allows scanning of the target image from a longer distance. Strong rating also holds the target image better. This means the experience is less likely to be interrupted when users change the phone’s orientation, shake the device or view it from an angle.
- Medium - Provides a moderate level experience. Phone must be located close to the target image. There is a possibility the phone/camera might lose the target while changing orientation or shaking the device. Also, viewing the image from a tilted angle can cause the recognition to be lost.
- Weak - Recognition is difficult, even from a short distance. Greater chance the phone will lose the target often and requires the user to aim the phone directly in front of the target image. Very difficult to view target image from an angle, while changing orientation or shaking the device.
Q: How can I use the 3D Workspace to know if my trigger image and content are working together?
In AR Designer, the 3D workspace will display your trigger image in a 3D space. If you have entered a specific size for the real-world image, the image in the workspace will be match that size on top of a 1m floor grid.
For now, 3D model experiences feature the trigger lying on the floor (assuming you want the model to stand on top of it. Video experiences will map the video screen directly in front of the trigger image, sized within it. But in the near future, we'll be providing much more flexibility in how to orient and position your trigger and its content. Stay tuned!