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      What's new: 
      
         You can press three sphere-like buttons on the right of the TV to 
            switch between channels.Bonus Point: special control 1: touch screen. When Ray Tracing Channel is selected you can 'touch' the 
            screen to select the spheres on the screen and drag to move it.
         Bonus Point: sliders and toggle button. You can walk to the witch to show 2 additional controls. One to 
            button show the stars. The slider will change the opacity of the body.
         Walk to the torus to 'eat' it.Bonus Point: special control 2: clickable ground. You can walk by pressing the arrow keys on your keyboard, or click on 
            the ground where you want to go.
         Demo VideoHere you can browse the source of this assignment.  
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