This is going to be a long post. You have been warned.
Jim Rugg was the on set special effects guy. "Special Effects" became this catch-all phrase to encompass anything remotely tricky - prop, physical, or optical. Nowadays, we try to split it up between "Special" for the on set stuff and "Visual" for the stuff done in post. But, let's face it, 90+ years of unstandardized terminology is hard to overcome. (My Mom still says I work in "Special Effects" to her friends. Can't fight it, really.........)
Darn near everyone who had an optical printer in Hollywood worked on Trek at some point. Howard Anderson, Van derVeer Photo Effects, Westheimer (where Richard Edlund (yeah, that Richard Edlund) worked on the main titles). The "stock" footage that was shot early on in the series' was re-purposed time and again. With elements traveling between houses and being used for so long, there had to inconsistencies and quality control issues.
I think -... . .- --.. hit on something key - we only started noticing the defects as the "viewing" technology outpaced the "recording" technology. I'll also add that we, the audience, also got sophisticated. I didn't notice ANY of the differences between the pilot model of the Enterprise and the series model when I first started watching the show when I was around 6 years old. But by the time I was 11, you can bet I noticed that 'Battlestar Galactica' was just recycling shots by flopping them! (Thank you "Making of Star Wars" for destroying my suspension of disbelief!)
Regarding the technological differences between '2001', 'Star Trek', and 'Star Wars', here's a brief rundown -
I tend to refer to the period before '2001' as the "what you see is what you get" period. Anything that you saw on screen had to be shot with a camera. Period. Yeah, you could add animation and do some split screen work, but all of that had to be shot with a camera using the same basic techniques as you would with actors or sets. Need a plane skimming a harbor to blow up some ships? You built a REALLY large model and filmed it -
Ditto for a Space Ark leaving Earth -
(By the way, go here and take a look at the images Life magazine has. You can search for other movies like 'Destination Moon' or '2001' -
worlds collide source:life - Google Search )
Bluescreen photography isn't a new thing. It goes back to the 30's and was also used with early B&W movies. Some movies used it, but for television, it was expensive, especially when TV shows like 'Lost In Space' and 'Voyage to the Bottom of the Sea' were better suited for more traditional approaches. 'Star Trek' had to use it. And the optical printer, another expensive tool. Save for the fact that there was an extra step (the optical process, which was multiple steps in itself), the method to shoot the miniatures was pretty much the same. You could undercrank or overcrank, but generally, you had the camera and a strong dolly grip.
'2001' introduced an new approach to the filming methodology part of the process. Since bluescreens are finicky to light and prone to all sorts of issues, and since white spaceships on a black starfield is essentially a B&W movie, why use bluescreen? On top of that, depth of field is one of the dead giveaways that you are looking at a model on a stick. So, they needed a way to expose each frame of film for a very long time. That meant that the camera had to be rock steady during the time the shutter is open. Clearly, a human dolly grip, even one that was really good, wasn't going to work. The mechanical solution involved worm gears and what amounts to heavy duty industrial machinery akin to a lathe. The principle is simple and one you can see for yourself. Take a bolt and thread a nut on it. When you turn the nut, it travels along the bolt. But, if you hold the nut steady and turn the bolt, the nut will still travel along the bolt. So, imagine the camera dolly is the nut and the bolt is a long lead screw. By powering the lead screw, the camera will travel along the length of the track. (If you try this, you'll notice that there is a lot of slop with a common nut an bolt. With lead screws and better quality control, you can get a fairly decent, steady camera dolly.)
Because of this precision, you can back up the camera to the same start point and record a second (or third, or fourth...) pass on the same or different piece of film, so long as the motor is traveling at the same RPM. (I think Doug Trumbull has said that the motor was always turning. Therfore, the camera was always moving - just really s l o w l y.) With repeatability, you can do frontlight/backlight mattes, which offer superior image quality to bluescreen.
The downside, however, is twofold. Doing complicated camera moves is tricky if you are utilizing the repeatability feature. Since these things relied on little marks on the track, the timing had to be perfect. You couldn't ease into a dolly or a pan, nor could you slow down at the end of the move. And there was no way to do all three AND have the model do something. Watch '2001' and you see that most of the ships (save for the landing sequences of the Moonbus and Aries, which were shot 'live') move at the same rate and very slowly (to avoid motion blur). That's the second problem - speed. You can't really have ships zipping around at warp speed because you will get motion blur, and frontlight/backlight mattes don't work well with motion blur. Thankfully, the nature of the story in '2001' lent itself to the slower pace.
'Silent Running' was done pretty much the same way. They just tried to incorporate front projection into the filming of the Valley Forge to eliminate the opticals.
'Star Wars' used a new type of motor - a stepper motor. A
common motor runs when you apply current to it. You can vary the rate by which the shaft rotates by varying the current or varying the load on the shaft. Good motors will offer a fair amount of precision once you get them up to a sufficient RPM. But at lower speeds and/or heavier loads, they are imprecise for repeatability's sake. A
stepper motor relies on tiny pulses of electricity to turn it's shaft. Imagine flipping the switch of a common motor on and off really quickly. Do it fast enough and the shaft won't make a full revolution. Each pulse of electricity turns the shaft a fixed amount. "X" number of pulses = 1 revolution. The track can be divided up into inches. Each inch of travel = a set number of revolutions. Each revolution = a set number of pulses. The same number of pulses with reverse polarity gets you back to the original point. Bingo. Repeatability.
These motors are relatively small, and each one has its own dedicated driver that controls the pulses. This mean that you can put a separate controllable motor on each axis of movement. Dolly, Pan, Tilt, Boom, etc..... You can put one on the model mover so the model can move as the camera moves (just like they did manually on 'Star Trek'). So, what 'Star Wars' introduced was not a motorized camera dolly, but an entire integrated camera system.
This whole system allows you to take time (the length of a shot), break it down into a series of frames, and plot out the distance the camera needs to travel (or pan or tilt) within that time frame and program the motors to make the required number of revolutions. You can change the rate (the number of pulses in a given set of time) and that allows you to ease into or out of a move. That means the moves can be smoothed out instead of jerky 'on' or 'off' options. Vary the shutter speed during the move and you can have things move fast or slow. And because you (or rather the computer memory) can remember how many pulses were applied to a given motor, it can apply the same number of pulses, but with a different polarity, and cause them to move back to their start point. Every time. All day long. Welcome motion control -
Gene
(I'll cover how the computer "controlled" everything in another 'brief' :lolpost later.)