DOUBLE VISION
The Reality Camera System is the reason why robots5 appear to fall into your lap during SK3D. The camera has two lenses side by side instead of one lens like a regular video camera. The lenses follow the actors and adjust as they move closer to and farther away from the action.
“We're mimicking6 human eyesight,” says SK3D's photography director, Vince Pace, who helped invent the camera. “Your eyeballs turn in toward your nose to look at close-up objects but stay parallel7 to see things far away. The camera does the same thing.”
Just as each of your eyes sends separate information to the two sides of your brain, each camera lens sends different information to two minicomputers inside the camera. It's almost like the camera is “seeing” the way a human would!
RED SIGHT and BLUE
But you need those funny-looking glasses to feel as if the motorbikes in SK3D are crashing toward you. Here's why.
After the left and right images are captured, they're colored. The images taken with the camera's left lens are tinted8 red; the images from the right lens are tinted blue.
That's where the glasses come in. The red plastic over your left eye allows that eye to see only the left lens' images when they're projected on the movie screen. The blue plastic over your right eye allows that eye to see only the right lens' images.
Then your brain combines9 the two separate images into one. The result? You're seeing what the camera saw: a 3-D image. 3D WORKOUT
Working with the Reality Camera System takes extra effort from the director and actors.
“When you look at the camera, you can't look at just one lens,” says Daryl Sabara, who plays Juni. “You have to look dead straight in the middle. Otherwise your eyes will look crossed on-screen.”
And a chair placed too close to the camera, for instance10, could look like it's popping out at you, taking attention away from the action.
"You constantly11 rethink how you'll do a shot," says director Robert Rodriguez. “A 3D movie is a complete world. It's not just a flat image in front of you.”
There's nothing like the spiky12 end of a fighting stick coming right at your head to convince you of that!
The actors were usually shot against a green screen, with background and special effects created on a computer and added later. For instance, the floating robot Orbit is totally digital; Daryl Sabara, who plays Juni, had to pretend the robot was there while shooting their scene.
3D History
A hundred years ago, the first three-dimensional movie showed a locomotive13 seeming to steam straight out of the screen. Some watchers ran from the theater in fear of being crushed14! Over the years, 3D came and went but never caught on15 big. Cameras were heavy and bulky16. Picture quality was poor. And nobody liked wearing the funny glasses. Today's 3D uses lightweight video camcorders17. Digital pictures are tops. You still need glasses—but experts are working on that, too. A new wave of 3D movies using the new digital technology is headed for theaters. And someday, 3D might even come to TV.
复视
《3D》中机器人看起来好像倒在你的膝上，其中的奥妙就在仿真摄影系统。摄影机有两个并排的镜头，而普通摄影机只有一个。镜头随着演员移动并根据他们的动作推进或拉远。
《3D》的摄影导演、辅助发明这部摄影机的文思·佩斯说：“我们是在模仿人的视力。眼球视线汇向鼻尖看近在咫尺的东西时，但在远眺时眼球视线保持平行。我们的摄影机即如法炮制。”
就像你的双眼将各自的信息发送到左右大脑一样，摄影机的双镜头将不同的信息发送到两个内置的微电脑，摄影机简直就像真人一样在“看”！
红蓝视图
不过你还需要那些怪模怪样的眼镜来体验片中摩托车直冲向你的感觉，为什么呢？
左右两边抓拍到的图像都是彩色的，左镜头拍摄的图像带红色，而右镜头的图像则是蓝色。
这就是需要眼镜的原因。影像投射到屏幕上时，左眼上的红塑料片只让左眼看到左镜头拍摄的影像，而右眼上的蓝塑料片则只让右眼看到右镜头的影像。
然后，大脑将两个分离的影像合二为一。结果呢？你就看到了摄影机里看到的3D影像。
3D处理
用仿真摄影系统进行拍摄，从导演到演员都得付出额外的努力。
“当你盯着摄影机时，你不可能只看一个镜头。”饰演居尼的达尔·萨巴拉说：“你得死盯着中间，要不然看屏幕时你的眼光交叉不定。”
再比方说，一把椅子放得离摄像机太近的话，看起来好像会弹出来直冲你去似的，把你的注意力从动作上引开了。”
“你得反复地琢磨怎么拍一个镜头。”导演罗伯特·罗德里格斯说：“一部3D电影就是一个完整的世界，绝不仅仅是你面前的平面影像。”
只要《3D》片尾激战中的武棍径直砸向你头顶的时候，你就心服口服了！
演员们通常在一幅绿色屏幕前拍摄，后期再加上电脑制作的背景和特效。比如，飘浮的机器人奥彼得完全是数码合成，拍摄时，饰演居尼的达尔·萨巴拉得假装好像真有机器人在场似的。
3D历史
一百年前，第一部3D电影里的火车冒着蒸汽隆隆驶离屏幕，竟有观众唯恐被火车轧扁纷纷从影院逃离。多年以来，不时有人拍些3D电影，不过从没成大气候。摄影机又笨又重，影像质量很差，也没人喜欢戴那个怪模怪样的眼镜。如今3D使用轻盈的便携摄影机，数字画面一流。可你还是得戴眼镜—— 不过专家们正在着手解决这个问题。应用新数字技术的3D电影浪潮即将席卷影院，总有一天，3D或许会走向电视。
1. 3D: 3 dimensional adj． 三维空间的，立体的
2． lava n． 熔岩
3． hurtling adj． 疾驰的，飞奔的
4． NG ＝ no good
5． robot n． 机器人
6． mimic v． 模仿 (mimicked，mimicking)
7． parallel adj． 平行的
8． tint [tint] v． 带……颜色
9． combine v． 合并
10． for instance 比如
11． constantly adv． 经常的
12． spiky adj． 尖的
13． locomotive n． 机车，火车头
14． crush v． 碾碎
15． catch on 流行
16． bulky adj． 体积大的
17． camcorder n． 便携式摄像机