I am new to Vuforia so I started with the SampleApplication in Android with Java. What I am trying to achieve is to recognize some object and compute the position of the object to the camera. Like how far is this object to the device.
When I looked into the code for the SampleApplication.Object Reco, I see that it renders a bounding box on the object in scene and the size of the box is changing when the object moves away from the camera. I notice that the App uses the getPose() API on the trackableResult and get a modelViewMatrix. But I couldn't fully understand the math behind the scene and figure out how to compute the distance. My idea is that if I can get the size of the object on screen, combinded with the size of the object in database, I can know the difference in distance.
Thank you in advance for any help.