Three dimensional animation system and method

• US 6,559,845 B1
• Filed: 06/11/1999
• Issued: 05/06/2003
• Est. Priority Date: 06/11/1999
• Status: Expired due to Term

• Current Assignee: Tumbleweed Holdings LLC (Equitable IP Corporation)
• Original Assignee: Pulse Entertainment Incorporated (Donnerwood Media, Inc.)
• Inventors: Harvill, Young, Bean, Richard
• Primary Examiner(s): Vo, Cliff N.
• Application Number:
  US09/330,681
• Time in Patent Office: 1,425 Days
• Field of Search: 345/473, 345/474, 345/475, 345/418
• US Class Current: 345/473
• CPC Class Codes: G06T 13/40 of characters, e.g. humans, animals or virtual beings
• CPC Class Codes: G06T 2200/24 involving graphical user interfaces [GUIs]

Abstract

A system and method for three dimensional character animation provides a rapid download of the animated character since the persistent data of the animated character may be downloaded initially to begin the animation. One or more behavior files may then be downloaded as needed which reduces the initial download time of a character. The system may store the persistent data in a character cache. To reduce the size of the behavior files, the persistent data may include morphlinks, for each polygon on the character, that determine the contributions that the movement of each joint in the character make on each polygon of the character.

Claims

1. A system for animating a character on a computer, comprising:

a first computer for storing one or more pieces of data associated with a particular animated character, the pieces of data including a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the pieces of data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model; and

a second computer connected to the first computer by a communications network, the second computer further comprising means for initially downloading the persistent data file from the server computer in order to begin the animation of the animated character and means for asynchronously downloading a behavior file from the first computer just prior to the execution of the behavior of the animated character by the second computer.

2. The system of claim 1, wherein the initially downloaded persistent data further comprises an idle behavior for the animated character, the idle behavior being executed when there is no other behavior being executed by the second computer for the animated character.

3. The system of claim 1, wherein the second computer further comprises a persistent storage device that includes a character cache that stores the persistent data about that animated character so that the persistent data is still resident on the second computer after the animation has been completed.

4. The system of claim 1, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints.

5. The system of claim 4, wherein the morphlink further comprises a contribution value for each joint that affects the polygon wherein the contribution values for all of the joint that affect the polygon are added together to determine the movement of the polygon.

6. The system of claim 5, wherein each joint in the geometric model further comprises an inner area of influence surrounding the joint and an outer area of influence surrounding the inner area of influence wherein the movement of the polygons within the inner area of influence is similar to the movement of the joint, the movement of the polygons outside of the inner area of influence but inside the outer area of influence is less than the movement of the joint and the movement of polygons outside of the outer area of influence is not affected by the movement of the joint.

7. The system of claim 6, wherein polygons in the outer area of influence are affected increasingly less by the movement of the joint as the polygon is located farther away from the joint.

8. The system of claim 1, wherein the persistent data further comprises a lighting environmental map for the animated character, the lighting environmental map comprising a lighting model illuminated onto a surface of a sphere so that the lighting on each polygon in a particular location on the animated character is looked up from the corresponding location on the sphere.

9. The system of claim 4, wherein the geometric model comprises an object representing each joint of the animated character and wherein the behavior files comprises an object for each joint containing data about the movement of each joint during a particular behavior, the polygons of the animated character moving based on the behavior file and the morphlinks.

10. The system of claim 9, wherein the behavior file further comprises one or more key periods during the behavior wherein each joint is able to move during each key period.

11. The system of claim 10, wherein the behavior file further comprises a sound track associated with the behavior, the sound track being synchronized to the one or more key periods.

12. The system of claim 9, wherein the behavior file further comprises a plurality of individual behaviors associated with the animated character and means, based on predetermined input, for selecting one of the individual behaviors to be executed for the animated character.

13. The system of claim 1, wherein each behavior file further comprises a stream file containing behavior data and sound data associated with a streaming behavior, and wherein the second computer further comprises means for streaming the stream file from the first computer so that the behavior associated with the stream file is executed before the entire stream file is downloaded to the second computer.

14. The system of claim 13, wherein the streaming means further comprises means for downloading a behavior object and a predetermined portion of the stream file when the behavior is selected, means, while the behavior is executing, for downloading one or more other predetermined portions of the stream file.

15. The system of claim 14, wherein the streaming means further comprises means for halting the downloading of the stream file when the behavior data being downloaded is more than a predetermined number of seconds ahead of the behavior data being executed.

65. The system of claim 1, the second computer further comprising:

a data storage for storing the downloaded data; and

an instruction for deleting data that are less likely to be reused than a newly downloaded data if the deleting is necessary to make room to store the newly downloaded data.

74. The system of claim 1, wherein the geometric model farther comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character such that each morphlink is associated with at least one polygon, each morphlink comprising a coordinate system and weighted contributions defining the movement of the polygons in the coordinate system.

78. The system of claim 1, wherein the pieces of data further comprise update scripts including commands about a behavior.

90. The system of claim 4, wherein the behavior file contains joint movement data about the movement of each joint in the model so that the second computer combines the morphlink in the persistent data with the joint movement data to execute a behavior.

91. The system of claim 1, wherein the persistent file further contains program commands in the form of scripts.

92. The system of claim 15, wherein the persistent data file further contains program commands in the form of scripts.

95. The system of claim 3, wherein some of the pieces of data are manually identified as persistent data.

16. A method for animating a character on a computer, comprising:

storing one or more pieces of data associated with a particular animated character on a first computer, the pieces of data including a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the pieces of data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model;

initially downloading the persistent data file from the first computer to a second computer over a communications network so that the animation of the animated character begins on the second computer; and

asynchronously downloading a behavior file from the first computer to the second computer just prior to the execution of the behavior of the animated character by the second computer.

17. The method of claim 16, wherein the persistent data further comprises a idle behavior for the animated character, the idle behavior being excused when there is no other behavior being executed by the second computer for the animated character and wherein the idle behavior includes a movement.

18. The method of claim 16 further comprising storing the persistent data in the second computer using a persistent storage device so that the persistent data is still resident on the second computer after the animation has been completed.

19. The method of claim 16, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints.

20. The method of claim 19, wherein the morphlink further comprises a contribution value for each joint that affects the polygon wherein the contribution values for all of the joint that affect the polygon are added together to determine the movement of the polygon.

21. The method of claim 20, wherein each joint in the geometric model further comprises an inner area of influence surrounding the joint and an outer area of influence surrounding the inner area of influence wherein the movement of the polygons within the inner area of influence is similar to the movement of the joint, the movement of the polygons outside of the inner area of influence but inside the outer area of influence is less than the movement of the joint and the movement of polygons outside of the outer area of influence is not affected by the movement of the joint.

22. The method of claim 21, wherein polygons in the outer area of influence are affected increasingly less by the movement of the joint as the polygon is located farther away from the joint.

23. The method of claim 16, wherein the persistent data further comprises a lighting environmental map for the animated character, the lighting environmental map comprising a lighting model illuminated onto a surface of a sphere so that the lighting on each polygon in a particular location on the animated character is looked up from the corresponding location on the sphere.

24. The method of claim 19, wherein the geometric model comprises an object representing each joint of the animated character and wherein the behavior files comprises an object for each joint containing data about the movement of each joint during a particular behavior, the polygons of the animated character moving based on the behavior file and the morphlinks.

25. The method of claim 24, wherein the behavior file further comprises one or more key periods during the behavior wherein each joint is able to move during each key period.

26. The method of claim 25, wherein the behavior file further comprises a sound track associated with the behavior, the sound track being synchronized to the one or more key periods.

27. The system of claim 24, wherein the behavior file further comprises a plurality of individual behaviors associated with the animated character and means, based on predetermined input, for selecting one of the individual behaviors to be executed for the animated character.

28. The method of claim 16, wherein each behavior file further comprises a stream file containing behavior data and sound data associated with a streaming behavior and further comprising streaming the stream file from the first computer to the second computer so that the behavior associated with the stream file is executed before the entire stream file is downloaded to the second computer.

29. The method of claim 28, wherein the streaming further comprises downloading a behavior object and a predetermined portion of the stream file when the behavior is selected, and, while the behavior is executing, downloading one or more other predetermined portions of the stream file.

30. The method of claim 29, wherein the streaming further comprises halting the downloading of the stream file when the behavior data being downloaded is more than a predetermined number of seconds ahead of the behavior data being executed.

66. The method of claim 16, wherein the downloaded behavior file is a new behavior file, further comprising:

storing the new behavior file in a data storage; and

deleting at least one behavior file that is less likely to be reused than the new behavior file if the deleting is necessary to store the new behavior file.

75. The method of claim 16, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character such that each morphlink is associated with at least one polygon, each morphlink comprising a coordinate system and weighted contributions defining the movement of the polygons in the coordinate system.

79. The method of claim 16, wherein the pieces of data further comprise update scripts including commands about a behavior.

96. The method of claim 18, wherein some of the pieces of data are manually identified as persistent data.

31. An apparatus for animating a character on a computer based on animation data contained on another remote computer, the apparatus comprising:

means for communicating with the remote computer in order to download the animation data from the remote computer, the animation data comprising a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the animation data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model;

means for initially downloading the persistent data file from the remote computer in order to begin the animation for the animated character on the computer; and

means for asynchronously downloading a behavior file for the remote computer just prior to the execution of the behavior of the animated character by the computer.

32. The apparatus of claim 31, wherein the persistent data further comprises an idle behavior for the animated character, the idle behavior being executed when there is no other behavior being executed by the second computer for the animated character and wherein the idle behavior includes a motion.

33. The apparatus of claim 31, wherein the computer further comprises a persistent storage device that includes a character cache that stores the persistent data about the animated character so that the persistent data is still resident on the computer after the animation has been completed.

34. The apparatus of claim 31, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints.

35. The apparatus of claim 34, wherein the morphlink further comprises a contribution value for each joint that affects the polygon wherein the contribution values for all of the joint that affect the polygon are added together to determine the movement of the polygon.

36. The apparatus of claim 35, wherein each joint in the geometric model further comprises an inner area of influence surrounding the joint and an outer area of influence surrounding the inner area of influence wherein the movement of the polygons within the inner area of influence is similar to the movement of the joint, the movement of the polygons outside of the inner area of influence but inside the outer area of influence is less than the movement of the joint and the movement of polygons outside of the outer area of influence is not affected by the movement of the joint.

37. The apparatus of claim 36, wherein polygons in the outer area of influence are affected increasingly less by the movement of the joint as the polygon is located farther away from the joint.

38. The apparatus of claim 31, wherein the persistent data further comprises a lighting environmental map for the animated character, the lighting environmental map comprising a lighting model illuminated onto a surface of a sphere so that the lighting on each polygon in a particular location on the animated character is looked up from the corresponding location on the sphere.

39. The apparatus of claim 34, wherein the geometric model comprises an object representing each joint of the animated character and wherein the behavior files comprises an object for each joint containing data about the movement of each joint during a particular behavior, the polygons of the animated character moving based on the behavior file and the morphlinks.

40. The apparatus of claim 39, wherein the behavior file further comprises one or more key periods during the behavior wherein each joint is able to move during each key period.

41. The apparatus of claim 40, wherein the behavior file further comprises a sound track associated with the behavior, the sound track being synchronized to the one or more key periods.

42. The apparatus of claim 39, wherein the behavior file further comprises a plurality of individual behaviors associated with the animated character and means, based on predetermined input, for selecting one of the individual behaviors to be executed for the animated character.

43. The apparatus of claim 31, wherein each behavior file further comprises a stream file containing behavior data and sound data associated with a streaming behavior, and wherein the second computer further comprises means for streaming the stream file from the first computer so that the behavior associated with the stream file is executed before the entire steam file is downloaded to the second computer.

44. The apparatus of claim 43, wherein the streaming means further comprises means for downloading a behavior object and a predetermined portion of the stream file when the behavior is selected, means, while the behavior is executing, for downloading one or more other predetermined portions of the stream file.

45. The apparatus of claim 44, wherein the streaming means further comprises means for halting the downloading of the stream file when the behavior data being downloaded is more than a predetermined number of seconds ahead of the behavior data being executed.

67. The apparatus of claim 31, further comprising:

a data storage for storing the downloaded behavior files; and

an instruction for deleting files that are less likely to be reused than a newly downloaded file if the deleting is necessary to make room to store the newly downloaded file.

76. The apparatus of claim 31, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character such that each morphlink is associated with at least one polygon, each morphlink comprising a coordinate system and weighted contributions defining the movement of the polygons in the coordinate system.

80. The apparatus of claim 31, wherein the animation data comprises update scripts including commands about a behavior.

93. The apparatus of claim 31, wherein the persistent data file further contains program commands in the form of scripts.

97. The apparatus of claim 31, wherein some of the animation data are manually identified as persistent data.

46. A server computer for downloading animation files to a remote computer connected to the server computer to animate a character on the remote computer, the server comprising:

means for storing one or more pieces of animation data associated with a particular animated character, the animation data comprising a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the pieces of data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model; and

means, in response to a request by the remote computer, for initially downloading the persistent data file to the remote computer in order to begin the animation of the animated character on the remote computer; and

means, in response to a request by the remote computer, for asynchronously downloading a behavior file to the remote computer just prior to the execution of the behavior of the animated character by the remote computer.

47. The server of claim 46, wherein the persistent data further comprises an idle behavior for the animated character, the idle behavior being executed when there is no other behavior being executed by the second computer for the animated character and wherein the idle behavior includes a motion.

48. The server of claim 46, wherein the second computer further comprises a persistent storage device that includes a character cache that stores the persistent data about that animated character so that the persistent data is still resident on the second computer after the animation has been completed.

49. The server of claim 46, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints.

50. The server of claim 49, wherein the morphlink further comprises a contribution value for each joint that affects the polygon wherein the contribution values for all of the joint that affect the polygon are added together to determine the movement of the polygon.

51. The server of claim 50, wherein each joint in the geometric model further comprises an inner area of influence surrounding the joint and an outer area of influence surrounding the inner area of influence wherein the movement of the polygons within the inner area of influence is similar to the movement of the joint, the movement of the polygons outside of the inner area of influence but inside the outer area of influence is less than the movement of the joint and the movement of polygons outside of the outer area of influence is not affected by the movement of the joint.

52. The server of claim 51, wherein polygons in the outer area of influence are affected increasingly less by the movement of the joint as the polygon is located farther away from the joint.

53. The server of claim 46, wherein the persistent data further comprises a lighting environmental map for the animated character, the lighting environmental map comprising a lighting model illuminated onto a surface of a sphere so that the lighting on each polygon in a particular location on the animated character is looked up from the corresponding location on the sphere.

54. The server of claim 49, wherein the geometric model comprises an object representing each joint of the animated character and wherein the behavior files comprises an object for each joint containing data about the movement of each joint during a particular behavior, the polygons of the animated character moving based on the behavior file and the morphlinks.

55. The server of claim 54, wherein the behavior file further comprises one or more key periods during the behavior wherein each joint is able to move during each key period.

56. The server of claim 55, wherein the behavior file further comprises a sound track associated with the behavior, the sound track being synchronized to the one or more key periods.

57. The server of claim 54, wherein the behavior file further comprises a plurality of individual behaviors associated with the animated character and means, based on predetermined input, for selecting one of the individual behaviors to be executed for the animated character.

77. The server of claim 46, wherein the geometric model further comprises one or more joints linked together by one or more bones and a plurality of polygons forming a skin over the joints and bones and wherein the persistent data further comprises a morphlink for each polygon on the animated character such that each morphlink is associated with at least one polygon, each morphlink comprising a coordinate system and weighted contributions defining the movement of the polygons in the coordinate system.

81. The server computer of claim 46, wherein the animation data comprises update scripts including commands about a behavior.

94. The server of claim 46, wherein the persistent data file further contains program commands in the form of scripts.

98. The server computer of claim 46, wherein some of the pieces of data are manually identified as persistent data.

58. A computer implemented system for generating a animated character using animation data, the animation data comprising:

a persistent data file containing a geometric model of the animated character comprising one or more joints linked together by one or more bones, a plurality of polygons forming a skin over the joints and bones of the animated character, and a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints; and

one or more behavior files, each behavior file containing data about a particular behavior of the animated character and specifying the movement of one or more joints in the animated character during the behavior wherein the movement of the polygons on the animated character during a behavior are determined by the behavior file and the morphlinks.

59. The system of claim 58, wherein the morphlink further comprises a contribution value for each joint that affects the polygon wherein the contribution values for all of the joint that affect the polygon are added together to determine the movement of the polygon.

60. The system of claim 59, wherein each joint in the geometric model further comprises an inner area of influence surrounding the joint and an outer area of influence surrounding the inner area of influence wherein the movement of the polygons within the inner area of influence is similar to the movement of the joint, the movement of the polygons outside of the inner area of influence but inside the outer area of influence is less than the movement of the joint and the movement of polygons outside of the outer area of influence is not affected by the movement of the joint.

61. The system of claim 60, wherein polygons in the outer area of influence are affected increasingly less by the movement of the joint as the polygon is located farther away from the joint.

62. A computer implemented system for generating a animated character using animation data, the animation data comprising:

a persistent data file containing a geometric model of the animated character comprising one or more joints linked together by one or more bones, a plurality of polygons forming a skin over the joints and bones of the animated character, and a morphlink for each polygon on the animated character, each morphlink comprising an association of the movement of the polygon to the movement of one or more joints in the geometric model so that the movement of the polygon is determined based on the movement of the one or more joints; and

one or more behavior files, each behavior file containing data about a particular behavior of the animated character and specifying the movement of one or more joints in the animated character during the behavior wherein the movement of the polygons on the animated character during a behavior are determined by the behavior file and the morphlinks.

63. A computer implemented system for generating a animated character using animation data, the animation data comprising:

a persistent data file containing information about the animated character including the joints in the animated character; and

one or more behavior files, each behavior file containing data about a particular behavior of the animated character and specifying the movement of the animated character during the behavior, each behavior file comprising behavior objects containing data about the movement of the animated character and one or more chunks of data associated with predetermined portions of the behavior, each chunk comprising one or more tracks containing behavior data associated with each of joints of the animated character.

64. A system for animating a character on a computer, comprising:

a first computer for storing one or more pieces of data associated with a particular animated character, the pieces of data including a persistent data file and one or more behavior files, each behavior file containing data about a particular behavior of the animated character comprising behavior objects and one or more chunks of data associated with predetermined portions of the behavior; and

a second computer connected to the first computer by a communications network, the second computer further comprising means for initially downloading the persistent data file from the server computer in order to begin the animation of the animated character and means for downloading a behavior file from the first computer just prior to the execution of the behavior of the animated character by the second computer, the behavior downloading further comprising means for initially downloading the behavior objects and a first chunk of the behavior data in order to execute the behavior, and means, while the behavior is executing, for asynchronously downloading the other chunks of the behavior data.

68. A system for animating a character on a computer, comprising:

a first computer for storing one or more pieces of data associated with a particular animated character, the pieces of data including a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the pieces of data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model; and

a second computer connected to the first computer by a communications network, the second computer further comprising an instruction for asynchronously downloading one or more pieces of data from the first computer.

69. The system of claim 68, wherein the asynchronously downloaded piece of data includes a persistent data file.

70. A method for animating a character on a computer, comprising:

storing one or more pieces of data associated with a particular animated character on a first computer, the pieces of data including a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the pieces of data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model; and

asynchronously downloading pieces of data from the first computer to a second computer over a communications network.

71. The system of claim 70, wherein the asynchronously downloaded pieces of data include a persistent data file.

72. A software product for animating a character on a computer based on animation data contained on another remote computer, the apparatus comprising:

an instruction for communicating with the remote computer in order to download the animation data from the remote computer, the animation data comprising a persistent data file containing one or more of a geometric model of the animated character, a texture associated with the animated character and a sound associated with the animated character, the animation data further comprising one or more behavior files, each behavior file containing data about a particular behavior of the animated character, each behavior specifying the movement of the model; and

an instruction for asynchronously downloading the animation data from the remote computer onto a storage device.

73. The software product of claim 72, wherein the asynchronously downloaded animation data includes a persistent data file.

82. A system for animating a character on a computer, comprising:

a first computer for storing at least one persistent data file associated with an animated character and at least one behavior file associated with the animated character, at least one of the persistent data file and the behavior file containing data about a particular behavior of the animated character; and

a second computer connected to the first computer by a communications network, the second computer comprising an instruction for initially downloading the persistent data file from the server computer in order to begin the animation of the animated character and an instruction for asynchronously downloading a behavior file from the first computer in anticipation of the execution of the behavior of the animated character by the second computer.

83. The system of claim 82, wherein the persistent data file contains a certain number of behavior segments and the behavior file contains commands to execute at least one of the behavior segments.

84. A method for animating a character on a computer, comprising:

storing one or more pieces of data associated with a particular animated character on a first computer, the pieces of data including a persistent data file and behavior files, at least one of the persistent data file and the behavior files containing data about a particular behavior of the animated character;

initially downloading the persistent data file from the first computer to a second computer over a communications network so that the animation of the animated character begins on the second computer; and

asynchronously downloading a behavior file from the first computer to the second computer in anticipation of the execution of the behavior of the animated character by the second computer.

85. The method of claim 84, wherein the persistent data file contains a certain number of behavior segments and the behavior file contains commands to execute at least one of the behavior segments.

86. A software product for animating a character on a computer based on animation data contained on another remote computer, the apparatus comprising:

an instruction for communicating with the remote computer in order to download the animation data from the remote computer, the animation data comprising a persistent data file and at least one behavior file, at least one of the persistent data file and the behavior files containing data about a particular behavior of an animated character;

an instruction for initially downloading the persistent data file from the remote computer in order to begin the animation of the animated character on the computer; and

an instruction for asynchronously downloading a behavior file from the remote computer in anticipation of the execution of the behavior of the animated character by the computer.

87. The software product of claim 86, wherein the persistent data file contains a certain number of behavior segments and the behavior file contains commands to execute at least one of the behavior segments.

88. A server computer for downloading animation files to a remote computer connected to the server computer to animate a character on the remote computer, the server comprising:

an instruction for storing one or more pieces of animation data associated with a particular animated character, the animation data comprising a persistent data file and at least one behavior file, at least one of the persistent data file and the behavior file containing data about a particular behavior of the animated character; and

an instruction for initially downloading the persistent data file to the remote computer in response to a request by the remote computer, in order to begin the animation of the animated character on the remote computer; and

an instruction for asynchronously downloading a behavior file to the remote computer in anticipation of the execution of the behavior of the animated character by the remote computer, in response to a request by the remote computer.

89. The server of claim 88, wherein the persistent data file contains a certain number of behavior segments and the behavior file contains commands to execute at least one of the behavior segments.