update scenes: In scenes 3 and 4, I uploaded new glb files; In all 4 scenes, I...

update scenes: In scenes 3 and 4, I uploaded new glb files; In all 4 scenes, I reduced the maximum distance of the 'free fly' so that the camera no longer goes out of the cavern; Clicking the fourth button returns the user to the home page; In the 'Free Fly' mode, you can fly at a maximum distance of 50 and at least 3 meters from the center; The speed of 'Free Fly' was 0.1 and became 0.04;