關於 how to use green screen ，我們在網路上蒐集到這些相關的討論、資訊與評價

一堂融入k-pop 與 puredata 的《基礎電腦音樂》
耗盡畢生修為寫教案。

在輔大音樂系任教的這幾年，是很幸運的。
學生與同事的討論都是深切地為教育更好而出發。
我所接觸過的輔大音樂系老師，永遠都是在關心學生，關心教學內容，真的！耳濡目染，我也常常有機會將教學訴諸文字。寫完這篇，感慨萬千。教育應當神聖，我也應當戰戰兢兢。反言之，若因此需要打其他工而繼續成就教育，不也是應當的嗎？算我天真小仙，當下如此，未來不可測也擔心不了。

這堂課看似基本，卻是我們許多任教者擺上歲月推敲，幾經開課，才孕育出的一堂課。我們親身體會，給音樂系同學真的需要的，你們真的要好好學，不要混。
我跟主任說，我也猜想有些東西大ㄧ可能有點難，但我相信我們音樂系的風氣，我們可以試試看！
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輔仁大學音樂系為台灣極早開創電腦數位音樂、應用音樂的相關課程的音樂系。在眾所音樂系中已具數位音樂教學上的知名與專業度。而科技發展日新月異，與時俱進的課程設計必須持續研究與實地應用反覆操演而調整。數位音樂發展至今，有許多線上的軟體開放大眾運用，其中有不少已可提供專業學習所需。《基礎電腦音樂》這一堂課，就是為了輔仁大學音樂系剛進大學的音樂新鮮人所設計，目標是以電腦音樂工具的應用，引導音樂系一年級新生，開始以數位方式的脈絡思考音樂創作與演奏的可能性。進而為準備好進入更進階的數位音樂課程，或是相關的學習與專業的發展。

本課程將應用實務的電腦音樂、古典音樂、流行音樂（k-pop\c-pop) 為基礎學習與作業案例，帶領學習者建立電腦音樂的基本觀念，應用工具的邏輯思考，與音樂結構本體的融合。建立音樂系的同學具備專業的電腦數位音樂基礎能力。

課程的進行，除了實際在電腦上的音樂製作，也設計提問的主題，從原因與目的來思考這門課的學習與將產出的成果。（例：進入應用電腦做音樂的世界，其實是一場數位音樂的策展。音樂系同學如何有完整的思考來完成創作，是不是“策展”這個概念可以幫助完成的？那又，何為策展？）

而因為是大一的課程，做學的方法方式傳達也更重要，通常，大一時若真心將心定好，之後大多不會太需要操心的了。

WHY DO YOU NEED TO UNDERSTAND MUSIC TECHNOLOGY? For most of you, technology has surrounded you all of your life: YouTube, Craigslist, Facebook, Wikipedia, emailing, IM’ing, texting, Googling, Skyping . . . it’s all second nature. Technology is neither your friend nor your enemy: it just is. In one writer’s term, you are “digital natives” (Prensky, 2001)—using technology is not going to be a problem for you. For some technologies, it’s OK to just use them. You don’t have to know how Facebook or Google work; there are buttons to click and places to type and everything just works. However, for technologies that you are going to use professionally, you must go beneath the surface to find the underlying concepts in order to use them effectively. To take an example from another field, you don’t have to know how a movie camera works or how CGI effects are done in order to watch a movie. But if you wanted to make movies, you would. Many DVD commentaries and extras featuring movie directors are full of technical details about camera lenses and green screen techniques. The same principle holds true for music technology: if you want to create, perform, or educate using music technology, you have to understand how it works in order to use it effectively. If using music technology effectively were just a matter of learning a piece of gear or a piece of software, the video tutorials that you can probably find on YouTube would do the job. However, to really use technology to its fullest, to grasp the software and hardware concepts when they appear in different contexts, to evaluate the impact and value of new technologies, it is necessary to discover the ideas and concepts that connect different music technologies together. When you are in command of the underlying ideas in music technology, you are in command of the technology itself. This book is dedicated to the proposition that a greater understanding of music technology can enrich your professional life and give you the tools to expand beyond your current experiences. Whether you find it intimidating, exhilarating, or just an ordinary part of the fabric of everyday life, music technology provides critical tools for the modern musician. (Dan Hosken：An Introduction to Music Technology"

https://ithelp.ithome.com.tw/articles/10243576

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10:30 Invest in LIGHTS
12:22 Choosing Virtual Backgrounds
14:50 SOUND: Where to Put Your Microphone
17:27 Why Headphones May Not Be a Good Idea
20:00 Virtual Waiting Rooms
22:50 Buy Software, Not Pants
25:39 Why You Need Video Skills
28:21 How To Engage Your Audience
30:40 "Negotiate Bandwidth"
36:52 The Most Flattering Webcam Angle
37:35 Your Hands as Communication Tools
39:37 Voice Techniques
41:47 Make Slides Your Ally, Not Your Adversary
44:50 Doing Oral (Aural) Correctly
45:27 Engage Your Audience, Sequentially
47:50 Use Your, and Their, Brain
48:42 When to Take a Break
51:00 Lighting Your Green Screen
54:28 You Can't Trust Your Audience to Be Interested

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【水世界】的前製設定與現場劇照

WATERWORLD (1995)
In celebration of today’s anniversary of this wet mess/epic. Let’s celebrate the hard work this crew put into bringing this world to life. Water movies are never easy but when it comes to this movie anytime you bring it up and a crew member from it is in earshot, the stories pour out. Not always bad, I know a AC that said he had a blast, he loved the boat rides out and all the camaraderie the crew had to have to get thru it. To all the crew that helped bring WATERWORLD to life, We salute you and thanks for the memories. I personally enjoy this hot mess of a movie, it’s one of the last ones of its kind...done practically...in a way.
let’s take a deepest of dives into WATERWORLD

The director, Kevin Reynolds, knew there would be problems before production had even started, “During pre-production. Because having never shot on water to that extent before, I didn’t really realise what I was in for. I talked to Spielberg about it because he’d gone to do Jaws, and I remember, he said to me, “Oh, I would never shoot another picture on water”.
“When we were doing the budget for the picture, and the head of the studio, Sid Sheinberg, we were talking about it and I said, “Steven told me that on Jaws the schedule for the picture was 55 days, and they ended up shooting a 155 days”. Because of the water. And he sat there for a moment and he said, “You know, I’m not sure about the days, but I do know they went a hundred percent over budget”. And so, Universal knew the potential problems of shooting on water. It’s monstrous.”
The film began with a projected budget of $100 million which had reportedly increased to $175 million by the end of production. The principle photography had overrun for at least thirty days more than originally planned due to one major decision.

Whereas today they would film in water tanks with partially built sets, employing green screens to fake the locations, back in 1995 they decided to build everything full size and shoot out on the ocean.

This causes extra logistical problems on top of those that already come with making a major action blockbuster. Cast and crew have to be transported to sets. The camera boats and sets float out of position and will have to be reset between takes taking up valuable production time.

The first draft of Waterworld was written by Peter Radar, a Harvard graduate who wanted to break into the film business. His contact in the film industry was Brad Kevoy, an assistant to the legendary director Roger Corman.

Roger Corman is best known for making films very quickly on a small budget. He also liked to give young talent a chance to direct and write their own films. Brad informed Peter that if he could write a Mad Max rip off, he would arrange to finance and let him direct the picture.

Radar came back and pitched the idea for what would become Waterworld. Kevoy took one look at him and said,

“Are you out of your mind? This would cost us three million dollars to make this movie!”
So Radar kept hold of the idea and decided to re-write the script but, this time, going wild. He wrote what he wanted to see on-screen, limited only by his imagination, not a real world production budget.

He managed to get the newly written script shown to a pair of producers with whom he had made contact with. They loved it and ironically they passed it onto Larry Gordon. He shared the enthusiasm saying it had the kind of cinematic possibilities he was looking for. A deal was signed on Christmas Eve of 1989.

As further script rewrites progressed, it became clear that Waterworld was too big for the Larry Gordon’s production company to undertake by themselves. In February 1992, a deal was signed with Universal Pictures to co-produce and co-finance the film. This was now six years after the first draft had been written.

Universal had signed director Kevin Reynolds to Waterworld. Whilst he was finishing his latest film, Rapa Nui, pre-production for Waterworld was already underway.

The decision was taken that the largest set for the film, known as the atoll, would be built full size. The atoll was the primary location for film and in the story served as the location for a small population of survivors.

The logic behind this decision was due to the high percentage of live action filming required in this location, as well as a huge action set piece. No sound stage would be big enough to incorporate this number of scenes and it was crucial that we see the mariner sail his boat into the atoll, turn around and set out again. A full-size construction was the only way to go as the use of miniature and special effects would be impractical.

The next problem was deciding where to build this huge set. After much research, Kawaihae Harbour in Hawaii was chosen as the location. The atoll could be constructed in the harbour and rotated when needed thus allowing for open sea in the background. Later towards the end of principle photography, the atoll could be towed out into the open sea for the filming of the big action sequences which would be impractical to shoot in an enclosed harbour.

Director Kevin Reynolds also discussed the possibility of using the same water tank as James Cameron’s The Abyss, which had filmed there around five years ago,

“We had even entertained the notion of shooting at that big nuclear reactor facility where they had shot The Abyss, to use it for our underwater tank. But we found it in such a state of disrepair that economically it just wasn’t feasible. We didn’t have as much underwater work as they did. Most of The Abyss is interiors and underwater and model work, ours is mostly surface exterior.”

The production company had originally envisioned building the atoll by linking approximately one hundred boats together and building upon this foundation, just like the characters in the film. The production crew set out to search Hawaii and get hold of as many boats as possible.

During this search, a unique boat in Honolulu caught their attention. Upon further investigation, they discovered it was built by Navitech, a subsidiary of the famous aircraft production company, Lockheed.

They approached Lockheed with the strange request of figuring out how they could build the foundations of the atoll. Lockheed found the request unusual but didn’t shy away from the challenging. They agreed to design the atoll foundation and Navitech would construct it.

Meanwhile, an 11ft miniature model of the atoll was sent out to a model ship testing facility in San Diego. Scaled wave tanks are used to determine the effects of the open sea on large scale miniature models of new untested ship designs. This would help determine what would happen with the unusual design of the atoll when it was out of the harbour.

The atoll, when finished, was approximately ¼ mile in circumference. It took three months to construct and is rumoured to cost around $22 million. As the atoll would be used out on the open sea, it required a seafaring license. Nothing like this had been done before and after much deliberation, it was eventually classed as an unmanned vessel. This meant that all cast and crew would have to vacate the set whilst it was towed into position. By the end of production, the atoll was towed out to sea a total of five times.

Shooting out on the open sea presented a series of logistical problem as Reynolds describes,

“We had an entire navy, basically – I mean, this atoll was positioned about a mile off-shore in Hawaii, it was anchored to the bottom of the ocean so it could rotate. What you don’t think about are things like, you’re shooting on this atoll to maintain this notion that there’s no dry land, you always have to shoot out to sea. Away from the land. So we chose a location where we had about a 180 degree view of open water. Nevertheless, any time when you’re shooting, there could be a ship appear in the background, or something like that, and you had to make a choice. Do I hold up the shot, wait for the ship to move out, or do we shoot and say we’re going to incur this additional cost in post-production of trying to remove the ship from the background.

And at that time, CGI was not at the point it is now, it was a bigger deal. And so, even though if you’re shooting across the atoll and you’re shooting out onto open water, when you turn around and do the reverses, for the action, you had to rotate the entire atoll, so that you’re still shooting out to open water. Those are the kinds of things that people don’t realise.

Or something as simple as – if you’re shooting a scene between two boats, and you’re trying to shoot The Mariner on his craft, another boat or whatever, you’ve got a camera boat shooting his boat, and then the other boat in the background. Well, when you’re on open water things tend to drift apart. So you have to send lines down from each of those boats to the bottom, to anchor them so that they somewhat stay in frame. When you’ve got a simple shot on land, you set up the camera position, you put people in front of the camera and then you put background in there. But when you’re on water, everything’s constantly moving apart, drifting apart, so you have to try to hold things down somewhat.

And these are simple things that you don’t really realise when you’re looking at it on film. But logistically, it’s crazy. And each day you shoot on the atoll with all those extras, we had to transport those people from dry land out to the location and so you’re getting hundreds of people through wardrobe and everything, and you’re putting them on boats, transporting them out to the atoll, and trying to get everybody in position to do a shot. And then when you break for lunch, you have to put everybody on boats and take them back in to feed them.”

The final size of the atoll was determined by the size of the Mariners boat, the trimaran. The dimensions for the trimaran were finalised very early on in pre-production, allowing all other vehicles and sets to be sized accordingly.

Production required two trimarans boats which are so called because they have three hulls. The first was based on the standard trimaran blueprint and built for speed but also had to accommodate a secret crew below decks.

During wide and aerial shots it would have to look like Costner himself was piloting the boat. In reality, a trained crew could monitor and perform the real sailing of the boat utilising specially built controls and television monitors below deck.

The second trimaran was the trawler boat which could transform into the racer through the use of special practical effects rigs. Both of these boats were constructed in France by Jeanneau. Normally this type of vessel requires a year to construct but production needed two boats in five months!

Normally once the boat had been constructed, Jeammeau would deliver it on the deck of a freighter, requiring a delivery time of around a month. This delay was unacceptable and so the trimarans were dismantled into sections and taken by a 747 air freighter to the dock Hawaii. Upon arrival, a further month was required to reassemble the boat and get them prepared for filming.

sets recreating the inside of the tanker were built using forced perspective in a huge 1000ft long warehouse which had an adjoining 2000ft field. In this field, they built the set of the oil tankers deck, again constructed using forced perspective. Using the forced perspective trick, the 500ft long set could be constructed to give the impression that it was really twice as long.

There’s more to a film than just it’s sets and filming locations. Over two thousand costumes had to be created with many of the lead actors costumes being replicated many times over due to wear and tear.

This is not an uncommon practice for film production, but due to the unique look of the people and the world they inhabit, it did create some headaches. One costume was created with so many fish scales the wardrobe department had to search the entire island of Hawaii looking for anyone who could supply in the huge quantity required.

Makeup had to use waterproof cosmetics, especially on the stunt players. As everyone had a sun burnt look, a three-sided tanning booth was setup. The extras numbering in their hundreds, with ages ranging from six to sixty-five, passed through the booth like a production line to receive their spray tan. The extras then moved onto costume before finally having their hair fixed and becoming ready for the day.

In some scenes, extras were actually painted plywood cutouts to help enhance the number of extras on the set. This can easily be seen in one particular shot on board the Deez super tanker.

Filming on the water is not only a difficult and time-consuming process but also very dangerous. It’s been reported that Jeanne Tripplehorn and Tina Majorino nearly drowned on their first day of filming.

Waterworld’s star Kevin Costner reported having a near-death experience when filming a scene in which the mariner ties himself to his catamaran to survive a storm. The pounding water caused him to black out and nearly drown.

Unbeknownst to most of the crew, Kevin Costner’s stunt double was riding his jet ski across 40 miles of open ocean between his home on Maui and the film’s set on the Big Island. When he didn’t show up for work one day, the production team phoned his wife, who informed them he had already left for work. The stunt double’s jet ski had run out of gas halfway through his “commute” and a storm had swept him farther out to sea. It took a helicopter most of the day to find him. The stunt doubles name was Laird Hamilton.

As well as the logistical problems of creating a film of this scale and on water, they also had to deal with the press who seemed intent on wanting the film to fail. Director Kevin Reynolds discusses the situation,

“It was huge, we were constantly fighting – people wanted to have bad press. That was more exciting to them than the good news. I guess the most egregious example of that that I recall was that the publicist told me that one day…we’d been out the day before and we were doing a shot where we sent two cameras up on a mast of the trimaran and we wanted to do a shot where they tilled down from the horizon down to the deck below. We’re out there, we’re anchored, we’re setting the shot up and a swell comes in, and I look over and the mast is sort of bending.

And I turned to the boatmaster and I said, “Bruno, is this safe?”. And he looks up the mast and he goes, “No”. So I said, “Okay, well, we have to get out as I can’t have two guys fall off from 40 feet up”. So, we had to break out of the set-up, and go back in a shoot something else and we lost another half-day.

Anyway, the next day the publicist is sitting in his office and he gets this call from some journalist in the States and he goes, “Okay. Don’t lie to me – I’ve had this confirmed from two different people. I want the facts, and I want to hear about the accident yesterday, we had two cameramen fall off the mast and were killed”.

And, he goes, “What are you talking about?”. And he goes, “Don’t lie to me, don’t cover this up, we know this has happened”. It didn’t happen! People were so hungry for bad news because it was much more exciting than…they just said it, and you know, it hurt us.”
Upon release, the press seemed to be disappointed that the film wasn’t the massive failure they were hoping it to be. Universal Studios told Kevin Reynolds that one critic came out of an early screening in New York and in a disappointed tone said,

“Well, it didn’t suck.”

It is true that during principle photography the slave colony set sank and had to be retrieved. However due to bad press, the rumour became much bigger and to this day when you mention the sinking set, most people assume it was the huge atoll.

During production, press nicknamed the film “Kevin’s Gate” and “Fishtar”, referring to 1980’s box office failures Heaven’s Gate and Ishtar. Heaven’s Gate failed so badly it led to the sale of United Artists Studio and has become synonymous with failure in Hollywood.

As well as the exaggerated set problems and other various production rumours, there were also difficulties with the script. In a risky move, the film was green lit and moved into production without a finalised script.

The final total is a reportedly thirty-six rewrites. One of the writers involved was Joss Whedon. Joss had worked on many scripts before becoming a director having being at the helm of both The Avengers and the sequel Avengers: Age Of Ultron. He described his experience on Waterworld as,

“Seven weeks of hell”
Everything came to a head just three weeks before the end of principle photography. Kevin Reynolds who was an old friend of Kevin Costner allegedly walked off set or was fired. There was no official statement on what happened.

When Reynolds left the production this event caused many changes to be made. Composer Mark Isham had already composed approximately two-thirds of the film’s score by the time Reynolds left and that event ultimately caused him to leave production. As Mark describes in this interview excerpt,

“Kevin Reynolds quit the film, which left me working for Kevin Costner, who listened to what I had written and wanted a completely different point of view. He basically made a completely different film — he re-cut the entire film, and in his meeting with me he expressed that he wanted a completely different approach to the score. And I said, “oh let me demonstrate that I can give that to you”, so I presented him with a demo of my approach to his approach, and he rejected that and fired me. What I find a lot in these big films, because the production schedules are so insane, that the directors have very little time to actually concentrate on the music.”
Rumours report that Costner took control of production. He directed the last few weeks of principle photography and edited the final cut of the film that was released in cinemas.

Reynolds discusses his surprise at discovering that one of the most famous scenes from what is known as the extended version, was left on the cutting room floor,

“…it would have differed from what you saw on the screen to some extent, and one of the things I’ve always been perplexed by in the version that was released, theatrically, although subsequently the longer version included it, and the reason that I did the film, was that at the very end of the picture, at the very end of the script, there’s a scene when they finally reach dry land and The Mariner’s sailing off and he leaves the two women behind, and in the script they’re standing up on this high point and they’re watching him sail away, and the little girl stumbles on something.
And they look down and clear the grass away and that’s this plaque. And it says, “Here, near this spot, 1953, Tenzing Norgay and Edmund Hillary first set foot on the summit of Everest”. And that was in script and I was like, “Oh, of course! Wow, the highest point on the planet! That would have been dry land!”. And we got it! We shot that. And they left it out of the picture. And I’m like, “Whaaat?!”. It’s like the Statue of Liberty moment in Planet of the Apes. And I was like, “Why would you leave that out?”

Written by John Abbitt | Follow John on twitter @UKFilmNerd

If any the crew cares to share any of their experiences on it please comment.
Thanks for reading
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An in-depth, advanced tutorial on how to use GREEN SCREEN and 3D LAYERS in AFTER EFFECTS to make OBJECTS FLOAT.
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