Breve storia delle immagini trimensionali. Dopo il film Avatar, si è riaperto l'interesse del pubblico per le immagini 3d. In realtà questo tipo di immagine non è affatto nuova come potrebbe sembrare. Il primo film in 3d risale addirittura al 1915 dove - in un teatro di New York - venne proiettato il primo breve video tridimensionale.
Negli anni 50 questa tecnologia riprende campo, e vengono prodotti una trentina di film tridimensionali sino al 1955
The reason for the very brief history lesson on 3D is merely to show everyone that not only has 3D been around for a long time, but also to show that in the past, it was more a fad or a "gimmick" than something long lived. All that changed with James Camerons production of Avatar where he reportedly spent close to a half billion dollars.
The biggest question for most of us film makers and professional videographers is "How will 3D effect us"? Not having a crystal ball, one can only look at the past and realize that it just might be safer to take the attitude of wait and see. As many of you might know, several TV manufactures and at least one video company, Panasonic Professional 3D Production Systems, seems to be willing to do more than sit on the sidelines.
Several months ago, I decided to check out the 3D situation and was surprised to find that there were several indie filmmakers who had dappled into the 3D test arena. Most of what I've seen is pretty amateurish, but at least it did show it could be done on at least the "consumer level". After contacting my friend Ken Stone, we decided it just might be cool to put together an article and some video 3D as an experiment. Here is the real funny part. After going to all the work of shooting and editing in 3D, neither Ken (Los Angeles) nor myself (Phoenix) could find even one pair of 3D glasses that would work using the Red & Blue (Cyan) gels. I finally had to order some out of Las Vegas at www.3dstereo.com.
After getting the glasses one week later, I now had an opportunity to view the results and it completely blew Ken and I away. It really was 3D. It took much experimenting to realize that the distance between the 2 lenses was critical to getting the 3D effect. My first experiment was using 2 of my Panasonic SD1 HD cameras. The biggest problem with these cameras was that the closest I could get the 2 lenses together was approximately 3 inches. This was just too far apart to view the objects that I was videotaping.
I next purchased 2 Flip Mino HD cameras because of their size and these 2 cameras really did the trick since I could get them as close as just 2 inches apart. I'm pretty sure that there is a formula for determining the ratio of distance versus the separation of the lenses, but so far haven't pursued that. I have found that for very close objects, say 3 feet away, you may have to move your cameras as close as 2 inches apart from each other. Most research and experimenting that I've done favor the 2-1/2 inch approach. One reason for this could be that the human eyes are approximately 2 1/2 inches apart.
For those of you who do not have two cameras to work with and would still like to experiment with 3D in FCP, I have supplied you with video clips that you can use. At the end of this article are two sets of 3D videos that you can download and work with, called Globe and Bird Bath. For each of these you are supplied with two source clips, shot with left and right cameras. These clips have been trimmed up so that they are in sync and have been transcoded to ProRes (LT). You can drop these two clips into a FCP timeline and then follow the instructions that are included later on in this article. You are also furnished with two completed 3D QuickTime movies that you can view with your red-blue 3D glasses.