Vfxhistory

From VFXWiki

Special effects (abbreviated SPFX or SFX) are used in the film, television, and entertainment industry to realize scenes, such as space travel, that cannot be achieved by live action or normal means.

They are also used when creating the effect by normal means is prohibitively expensive; for example, it would be extremely expensive to construct a 16th century castle or to sink a 20th century ocean liner, but these can be simulated with special effects. With the advent of computer graphics imaging, special effects are also used to enhance previously-filmed elements, by adding, removing or enhancing objects within the scene.

Many different special effects techniques exist, ranging from traditional theater effects or elaborately staged as in the "machine plays" of the Restoration spectacular, through classic film techniques invented in the early 20th century, such as aerial image photography and optical printers, to modern Computer generated imagery (or CGI). Often several different techniques are used together in a single scene or shot to achieve the desired effect.

Visual Effects (or 'VFX' for short) is the term given to a sub-category of special effects in which images or film frames are created or manipulated for film and video. Visual effects usually involve the integration of live-action footage with computer generated imagery or other elements (such as pyrotechnics or model work) in order to create environments or scenarios which look realistic, but would be dangerous, costly, or simply impossible to capture on film. They have become increasingly common in big-budget films, and have also recently become accessible to the amateur filmmaker with the introduction of affordable animation and compositing software.

Contents 1 Developmental history 2 Compositing 3 Special effects animation 4 CGI and SFX 5 Audio Effects 6 Visual special effects techniques

[edit] Developmental history

In 1867, Oscar G. Rejlander created the world's first "trick photograph" by combining different regions of 32 other photographs into a single image. In 1895, Patrick Clark created what is commonly accepted as the first-ever special effect on film. While filming a reenactment of the beheading of Mary I of Scotland|Mary, Queen of Scots, Clarke instructed an actor to step up to the block in Mary's costume. As the executioner brought the axe above his head, Clarke stopped the camera, had all of the actors freeze, and had the person playing Mary step off the set. He placed a Mary dummy in the actor's place, restarted filming, and allowed the executioner to bring the axe down, severing the dummy's head. “Such… techniques would remain at the heart of special effects production for the next century” (Rickitt, 10).

As the industry progressed, special effects techniques kept pace. The development of color photography required greater refinement of effects techniques. Also, color enabled the development of such travelling matte techniques as bluescreen and the sodium vapor process. Many films include landmark scenes in special-effects accomplishments: Forbidden Planet used matte paintings, animation, and miniature work to create spectacular alien worlds. In The Ten Commandments (1956 film)|The Ten Commandments, Paramount's John P. Fulton, A.S.C., multiplied the crowds of extras in the Exodus scenes, depicted the massive constructions of Rameses, and split the Red Sea in a still-impressive combination of travelling mattes and water tanks.

If one film could be said to have established the high-water mark for special effects, it would be 1968's 2001: A Space Odyssey, directed by Stanley Kubrick. In this film, the spaceship miniatures were highly detailed and carefully photographed for a realistic depth of field. The shots of spaceships were combined through hand-drawn rotocscopes and careful motion-control work, ensuring that the elements were combined in the camera-- a surprising throwback to the silent era, but with spectacular results. Backgrounds of the African vistas in the Dawn of Man sequence were created with the then-new front projection technique. The finale, a voyage through hallucinogenic scenery, was created by Douglas Trumbull using a new technique termed slit-scan. Even today, the effects scenes remain impressive, realistic, and awe-inspiring.

1977 was a watershed year in the special effects industry, because of two blockbuster films. George Lucas's film Star Wars ushered in an era of fantasy films with expensive and impressive special-effects. Effects supervisor John Dykstra and crew developed many improvements in existing effects technology. They developed a computer-controlled camera rig called the "Dykstraflex" that allowed precise repeatability of camera motion, greatly facilitating travelling-matte compositing. Degradation of film images after compositing was minimized by other innovations: the Dykstraflex used VistaVision cameras that photographed widescreen images horizontally along stock, using far more of the film per frame, and thinner-emulsion filmstocks were used in the compositing process.

That same year, Steven Spielberg's film Close Encounters of the Third Kind boasted a finale with impressive special effects by 2001 veteran Douglas Trumbull. In addition to developing his own motion-control system, Trumbull also developed techniques for creating intentional "lens flare" (the shapes created by light reflecting in camera lenses to provide the film's undefinable shapes of flying saucers.

These two films reflected a new sensibility among special effects technicians. Previously, studios were content to use the old techniques to achieve serviceable illusions. But a generation of technicians who weren't fooled by the old techniques now had the means (i.e., massive studio investment in effects-heavy films) to improve every tool in the special effects arsenal. Lucas, after the success of Star Wars, founded an innovative effects house called Industrial Light and Magic, which has spearheaded most effects innovations over the last few decades.

The single greatest recent innovation in special effects was the development of computer generated imagery (CGI). Although it had been used to striking effect in such films as Young Sherlock Holmes, its most impressive early use has come in films by James Cameron (The Abyss, Terminator 2: Judgment Day).

In 1993 Steven Spielberg's Jurassic Park used CGI to create realistic dinosaurs-- an indication that many of the older effects techniques would be changed radically if not rendered obsolete. Stop-motion animators working on the film were quickly retrained in the use of computer input devices. Digital compositing avoided the inherent graininess of optical compositing. Digital imagery enabled technicians to create detailed matte "paintings," miniatures, and even crowds of computer-generated people.

By 1995, films such as Toy Story underscored that the distinction between live-action films and animated films was no longer clear. Images could be created in a computer using the techniques of animated cartoons. It is now possible to create any image entirely inside a computer and have it look completely realistic to an audience.

[edit] Compositing

The art of compositing is that of combining two images, or elements of two images, together into one seamless shot. This can be done through green screen/blue screen, optical printing, and rotoscoping. Nowadays, this is usually done digitally, and often involves the incorporation of 3D models. special effects artists can trace an element in a shot, and the software, such as Apple Shake, will follow that object throughout the duration of the clip. The item can then be extraced from the shot, placed in another shot, and the edges softened or the "layer" colorized to match its new environment.

Compositing is done in layers, such as in programs like Photoshop. Individual layers, each with a certain amount of transparency, are added on top of each other to create a final image. It is necessary that some of the layers be partially transparent, so that they can blend with the other layers, and not dominate the full frame.

[edit] Special effects animation

Also known as effects animation, special effects animation is a specialization of the traditional animation and computer animation processes. Anything that moves in an animated film and is not a character (handled by character animators) is considered a special effect, and is left up to the special effects animators to create. Effects animation tasks can include animating cars, trains, rain, snow, fire, magic, shadows, or other non-character entities, objects, and phenomena. A classic case of this would be the lightsabres and laser-bolts in the original Star Wars, which were created by rotoscopy.

Sometimes, special processes are used to produce effects animation instead of drawing or rendering. Rain, for example, has been created in Walt Disney Feature Animation/Disney films since the late-1930s by filming slow-motion footage of water in front of a black background, with the resulting film superimposed over the animation.

Among the most notable effects animators in history are A.C. Gamer from Termite Terrace/Warner Bros.; and Joshua Meador, Cy Young, Mark Dindal, and Randy Fullmer from the Walt Disney animation studio.

Special effects animation is also common in live-action films to create certain images that cannot be traditionally filmed. In that respect, special effects animation is more commonplace than character animation, since special effects of many different types and varieties have been used in film for a century.

[edit] CGI and SFX

Effects that are created via computers are known as CGI (Computer generated Imagery) effects and they fit into the category of optical effects - a subset of SFX - because they involve altering a photographic image. Some people claim that because CGI effects are not produced during filming on-set (as in bullet hits, fire, flame, and explosions, wind, rain, etc.) that they are not SFX at all. However, as discussed above, effects produced during filming on-set are a different subset of SFX known as mechanical or practical effects. Other categories of SFX do exist, and CGI effects are still SFX.

[edit] Audio Effects

The art of adding audio effects to a film is done through either Foley, or pre-recorded sound effects. Foley refers to acting out the scene in a recording studio with the necessary props, such as doors, umbrellas, shoes, or whatever the characters in the scene are doing. If a person was walking across concrete, the Foley artist would probably put the shoes on his hands and tap them on concrete, while watching a screen to make sure he is doing it in sync with the action. Often, Foley sounds become better-known to moviegoers than the real sounds; an example is the traditional use of coconut shells for horses' hoofs.

Foley is required because so little actual production audio is used; there is often too much camera/crew noise and unwanted environmental noise for location audio to be useful as more than a reference. Shooting on a soundstage reduces the problem of unwanted sounds, but Foley recording is still necessary because the sounds produced on the stage may not be the same ones the director wants in the film, or may not be sufficiently clear due to the necessity of keeping microphones out of the scene.

[edit] Visual special effects techniques

• miniature effects
• matte paintings
• rotoscoping
• Dolly zoom
• optical effects
• travelling matte
• aerial image effects
• bluescreen
• motion control photography
• Audio-Animatronic models
• digital compositing
• wire removal
• morphing
• computer-generated imagery
• match moving
• Virtual cinematography