Grade Level: 6 (5-7)
Time Required: 2 hours 45 minutes Plan on spending one or two 50-minute classes to introduce the concepts of motion capture, animation and action-writing followed by two or three 20-minute sessions to critique drafts of the written action sequence.
Plan on spending one or two 50-minute classes to introduce the concepts of motion capture, animation and action-writing followed by two or three 20-minute sessions to critique drafts of the written action sequence.
Lesson Dependency: None
Subject Areas: Physical Science, Physics
SummaryStudents learn how motion capture (mo-cap) technology enables computer animators to create realistic effects. They learn the importance of center of gravity in animation and how to use the concept of center of gravity in writing an action scene. Note: The literacy activities for the Mechanics unit are based on physical themes that have broad application to our experience in the world — concepts of rhythm, balance, spin, gravity, levity, inertia, momentum, friction, stress and tension.
Since people naturally have an intuitive sense about balance, computer animation designers who want to create realistic effects must convey a convincing sense of balance in their work Authentic-looking special effects, such as collapsing bridges or exploding structures, must first convey a loss in equilibrium before they fail. Engineers must also be convincing communicators. When writing to persuade, it is sometimes helpful to catch the reader off balance to make a dramatic point.
After this activity, students should be able to:
- Use a full range of strategies to comprehend technical writing, newspapers, magazines, poetry, short stories, plays and novels.
- Choose vocabulary and figures of speech that communicate clearly.
- Learn the importance of center of gravity in animation and how to use the concept of center of gravity in writing an action scene
Each TeachEngineering lesson or activity is correlated to one or more K-12 science,
technology, engineering or math (STEM) educational standards.
All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN),
a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics;
within type by subtype, then by grade, etc.
Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards.
All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.
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General familiarity with the concepts of center of mass, center of gravity, balance and gravity
You have learned (in Mechanics unit, Lesson 6) that you and everything else on Earth have a center of gravity. Becoming aware of this concept can be very useful. Your balance might improve; you might get better at sports. You might also become a better writer.
It may surprise you to learn that sports writers are considered to be among the best writers in journalism. That's not really so surprising when you consider their subject — action. They literally write where the action is. Over time, they become very good at capturing the essence of action. Action is organized around a center — center of gravity — and that fact helps sports journalists to organize their writing. They also use lots of action verbs, short paragraphs, fast-paced description and fragment sentences.
Your teacher has probably been trying to get you to write complete sentences. That's good! You need to learn the rules in order to be in control of them. What you will find in this activity is that there is a time and a place for an occasional fragment sentence. That place is an action sequence.
In this activity, you will write an action sequence for computer animation. To prepare, you are going to learn about the latest techniques of motion capture, advanced technology that captures and digitizes movement data and applies it to a virtual actor in real time. It makes the "special effects" look realistic, primarily because the action of the figure is anchored in and organized around the actual movements of a human being whose motion is being captured. As an example, the Golum character in the Lord of the Rings film trilogy is a noteworthy achievement in motion capture.
Center of gravity: The point at the center of an object's weight distribution.
Center of mass: The point at the center of an object's mass distribution. For objects on Earth, this is the same as the object's center of gravity.
Motion capture: A process by which external devices can be used to capture movement data from various live sources. This data is then transmitted to the computer, where 3D simulation software displays it in real-time applied to a virtual actor. (Source: About.com, http://web3d.about.com/library/glossary/bldef-motion.htm)
Virtual: Created, simulated or carried on by means of a computer or computer network.
Call-Out Questions: Quiz students with call-out questions during the Observing and Thinking phases to be sure they understand the concepts of motion capture, center of gravity and how animation works.
Activity Embedded Assessment
Writing Drafts: This activity works through a succession of drafts that can be evaluated individually.
Expressive Writing: Success in capturing the feel of the action should be the primary criterion in evaluating the final draft of the action sequence. The use of fragment sentences is acceptable in this activity, if effectively used.
Discussion Questions: Ask the students, and discuss as a class.
- What is the center of gravity? (Answer: The point at the center of an object's weight distribution, so that at this point the body is balanced [or in equilibrium] in all positions. For objects on Earth, this is the same as the center of mass, which is the point at the center of an object's mass distribution.)
- Describe animation examples from movies or cartoons, in which you could tell that the center of gravity was or was not being portrayed realistically. (Answers: Vary with students' experience. For example, any cartoon in which the character has large, unbalanced features, like a nose that is so gigantic that his neck could never hold it up and it would probably be so heavy that it should drag on the ground. Or, a cartoon character that walks off a cliff and then spins his legs in the air to get back to the cliff, never falling!)
- Suggest examples of design projects in which engineers take into consideration an object's center of gravity or center of mass. (Possible answers: Designing airplanes or helicopters [for stability in the air], bridges or buildings [so they will not fall over], golf clubs or chef's knives [for ideal balance], etc.)
- Suggest examples in which working with your own center of gravity is important for success. (Possible answers: Riding a bicycle, diving into a pool, stepping on rocks to cross a stream, carrying a stack of dishes, sitting down, standing up, hopping on one foot, walking a balance beam or curb, etc.)
Lesson Extension Activities
Learn how the Golum character was "captured." Use the keywords "Golum" and "motion capture" in Google and at the Google news desk. Report your findings to the class.
How about a career in computer animation using the latest in motion-capture technology? Chances are the field will have advanced considerably by the time you are ready for a career, but there is no time like the present to start learning about this exciting technology. See The Advanced Computing Center for the Arts and Design (ACCAD), http://accad.osu.edu/, one of the leaders in the field, and its Motion Capture Lab, http://accad.osu.edu/researchmain/research/motion_lab/. How many applications for motion capture can you count besides computer animation?
The Advanced Computing Center for the Arts and Design (ACCAD). The College of the Arts, The Ohio State University. Accessed May 16, 2004. http://accad.osu.edu/
Center of Gravity, Science Snacks. Exploratorium, San Francisco, CA. Accessed May 16, 2004. http://www.exploratorium.edu/snacks/center_of_gravity.html
Chu, Chi-Wei (Wayne), Jenkins, O.C. and Matarić, M.J. "Markerless Kinematic Model and Motion Capture from Volume Sequences." Computer Vision and Pattern Recognition, Proceedings. 2003 IEEE Computer Society Conference. Volume 2, 8-20, pp. II-475-II-482, June 2003. (Source of motion capture center of gravity image)
Dictionary.com. Lexico Publishing Group, LLC. Accessed May 15, 2004. (Source of vocabulary definitions, with some adaptation) http://www.dictionary.com
Furniss, Maureen. Motion Capture. MIT Communications Forum. Accessed May 16, 2004. http://web.mit.edu/comm-forum/papers/furniss.html
Hulsey, S. B. "Kinko." Writing Action. Elfwood Tutorials: Fantasy Art Resource Project. Accessed May 16, 2004. (If the FARP site becomes inactive, contact the author via email: firstname.lastname@example.org) http://elfwood.lysator.liu.se/farp/thewriting/dra2action/dra2action.html
Li, William. Figure Drawing: Basic Pose and Construction. Elfwood Tutorials: Fantasy Art Resource Project. May 16, 2004. (If the FARP site becomes inactive, contact the author via email: email@example.com) http://elfwood.lysator.liu.se/farp/figure/williamlibodyconstruction.html
Motion Capture Downloads. Pyros Pictures Mocap. Accessed May 16, 2004. (Start with "Head Tracking"; lots of video clips that show how it's done; excellent site but connection is sporadic) Formerly at: http://www.pyros.com/html/body_movies.html
Motion Capture Lab. The Advanced Computing Center for the Arts and Design (ACCAD). The College of the Arts, The Ohio State University. Accessed May 16, 2004. http://accad.osu.edu/research/mocap/mocap_home.htm
Copyright© 2004 by Regents of the University of Colorado.
ContributorsJane Evenson; Malinda Schaefer Zarske; Denise Carlson
Supporting ProgramIntegrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder
The contents of this digital library curriculum were developed under a grant from the Fund for the Improvement of Postsecondary Education (FIPSE), U.S. Department of Education, and National Science Foundation GK-12 grant no 0338326. However, these contents do not necessarily represent the policies of the Department of Education or National Science Foundation, and you should not assume endorsement by the federal government.
Last modified: August 8, 2018