• Download it like this.

Step 1) Unzip the Data.zip
Step 2) Move the extracted files to a higher folder
Step 3) Run Linghting.exe file

↑    w    
←    a    
↓    s    
→    d    

• Rotation: move your mouse.
• Object Picking: click your mouse left button.

• Rotation Lock: click your mouse right button.

• To click this button then exited application

• Bounce the light against the glass, then try to fit the final circle