Ed Catmull and the Early Days of Computer Animation
Long before the digital revolution transformed cinema, a young Ed Catmull harbored a childhood dream of becoming a Disney animator. However, believing he lacked the natural drawing ability required for traditional animation, he pivoted toward the sciences. After graduating from the University of Utah in 1969 with degrees in computer science and physics, Catmull entered the workforce at Boeing. When a mass layoff terminated his position, he revisited his passion for animation, realizing that computers might provide a new medium for storytelling that didn't rely on a pencil.
The Challenge of Early CGI
In the early 1970s, computer animation was considered to be on the "lunatic fringe." At the time, most researchers were barely able to produce static images, let alone moving ones. The ambition to create a film far outpaced the available hardware, and the project faced significant mathematical and programming hurdles. Despite these obstacles, Catmull utilized a graduate course project in 1972 to attempt the creation of a short animated clip.
[ไม่มีภาพประกอบ]The Process of Digital Modeling
To create the animation, Catmull used his own left hand as the subject. The process began with a physical plaster-of-Paris mold of his hand—an experience that famously resulted in him accidentally pulling out the hair on the back of his hand during removal. From this mold, he created a plaster model and manually drew 350 small triangles and polygons in ink across the surface.
These polygons served as the blueprint for the digital model. Catmull and fellow student Fred Parke spent hours measuring the coordinates of every corner point of these polygons and manually entering the data into a machine using a Teletype keyboard. Using a custom 3D animation program written by Catmull, they were able to render the disembodied hand on a screen and animate its movement.
Collaborative Contributions
While Catmull focused on the hand, Fred Parke contributed a computer animation of his wife's face, which also appears in the film. Additionally, fellow student Bob Ingebretsen was responsible for creating the 3D titles seen in the final credits.
Capturing the Image
The final stage of production—transferring digital images to physical film—was an arduous task. Because the display hardware of the era could not show an entire image on the screen at once, Catmull had to use a long-exposure Polaroid camera to take snapshots of the screen to review his frames. Once the animation was finalized, the team used a 35mm camera, specially rigged by the department, to photograph the images directly from a CRT (Cathode Ray Tube) screen.
[ไม่มีภาพประกอบ]Key Facts
- Academic Background: Ed Catmull graduated from the University of Utah in 1969 with degrees in physics and computer science.
- Technical Method: The hand model was created using 350 ink-drawn polygons on a plaster mold.
- Data Entry: Coordinates for the 3D model were manually typed via a Teletype keyboard.
- Hardware Limitations: Frames were reviewed using long-exposure Polaroids because the screen could not display full images instantly.
- Final Medium: The footage was captured using a 35mm camera rigged to a CRT screen.
| Role/Component | Contributor/Method |
|---|---|
| Lead Programmer & Model | Ed Catmull |
| Face Animation | Fred Parke |
| 3D Titles | Bob Ingebretsen |
| Model Basis | Plaster-of-Paris mold of a human hand |
| Polygon Count | 350 triangles and polygons |
Frequently Asked Questions
Why did Ed Catmull turn to computers for animation?
Catmull originally wanted to be a Disney animator but felt he lacked the drawing skills necessary for traditional animation. He believed computers could provide an alternative way to animate.
How was the 3D model of the hand created?
Catmull made a plaster-of-Paris mold of his hand, created a plaster model from that mold, and drew 350 polygons on it. He then measured the coordinates of these polygons and entered them into a computer.
What hardware was used to record the animation?
The team used a 35mm camera that had been rigged to take photographs directly from a CRT (Cathode Ray Tube) screen.
How did Catmull review his work before filming?
Since the display hardware could not show the entire image at once, he took long-exposure Polaroid snapshots of the screen to see the resulting frames.
Who else contributed to the film?
Fred Parke helped produce the film and created an animation of his wife's face, while Bob Ingebretsen created the 3D titles.