Try it for yourself :
1. Make sure you download and print out the patterns file,
2. Allow flash access to your webcam below when it asks (or right click flash and select settings).
3. Point your webcam at the printed symbol, a 3D fixture model(KMZ format) will appear on top.
4. Once all the fixtures in right position, click "convert to 3D" button to view your design in 3D.
This is a test app, a proof of concept,
I am welcome any bug report or suggestion, email me. Thanks.