I added this to TestCameraMan's simpleUpdate() method:
float time = (float) timer.getTime() / timer.getResolution();
float fov = 60 + 20 * FastMath.sin(time/10);
(float) display.getWidth() / (float) display.getHeight(),
tRenderer.getCamera().setFrustumPerspective(fov, 1, 1,1000);
Now, I would expect both cameras to zoom in and out periodically. They don't. Only the "main" camera zooms, the movable one won't change. Calling both of the camera's update() methods won't change anything for the better, it seems to just apply the frustrum of whichever camera I update last to the whole scene. Did I misunderstand something , or should this work as I intend?