Proceedings: GI 2002

A Direct Method for Positioning the Arms of a Human Model

John McDonald, Karen Alkoby, Roymieco Carter, Juliet Christopher, Mary Davidson, Dan Ethridge, Jacob Furst, Damien Hinkle, Glenn Lancaster, Lori Smallwood, Nedjla Ougouag-Tiouririne, Jorge Toro, Shuang Xu, Rosalee Wolfe

Proceedings of Graphics Interface 2002: Calgary, Alberta, Canada, 27 - 29 May 2002, 99-106

  • BibTeX

     title = {A Direct Method for Positioning the Arms of a Human Model},
     author = {John McDonald and Karen Alkoby and Roymieco Carter and Juliet Christopher and Mary Jo Davidson and Dan Ethridge and Jacob Furst and Damien Hinkle and Glenn Lancaster and Lori Smallwood and Nedjla Ougouag-Tiouririne and Jorge Toro and Shuang Xu and Rosalee Wolfe}, 
     booktitle = (Proceedings of the Graphics Interface 2002 Conference, May 27-29, 2002, Calgary, Alberta, Canada},
     url = {},
     year = {2002},
     month = {May},
     location = {Calgary, Alberta},
     pages = {99--106}


Many problems in computer graphics concern the precise positioning of a human figure, and in particular, the positioning of the joints in the upper body as a virtual character performs some action. We explore a new technique for precisely positioning the joints in the arms of a human figure to achieve a desired posture. We focus on an analytic solution for the IK chains of the model's arms and an interface for conveniently specifying a desired targeting point, or articulator, on the model's hand. Also, we consider the problem of specifying a target for that articulator in space or in contact with the model's own body. These methods recast the seven degrees of freedom in the arm to provide a more intuitive interface for animation. We demonstrate the efficacy and efficiency of these techniques in positioning a virtual American Sign Language interpreter.