frame = session.update();
if(frame != null && fov == 0){
Camera camera = frame.getCamera();
if(camera != null){
float[] projmtx = new float[16];
camera.getProjectionMatrix(projmtx, 0, 0.1f, 100.0f);
fov = (float) (2.0 * Math.atan(1.0 / projmtx[5]) * 180.0 / Math.PI);
}
}









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