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Direct manipulation blendshapes.

J P Lewis1, Ken-ichi Anjyo

  • 1Victoria University, New Zealand. zilla@computer.org

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This study presents a direct manipulation algorithm for blendshape facial animation. It solves the inverse problem by using slider space distance for regularization, enabling efficient facial model editing.

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Area of Science:

  • Computer Graphics
  • Animation
  • Human-Computer Interaction

Background:

  • Blendshape models are widely used for facial animation.
  • Direct manipulation in blendshape animation presents an inverse problem, requiring inference of vertex movements.
  • Existing methods may lack intuitive control for artists.

Purpose of the Study:

  • To introduce a simple direct manipulation algorithm for blendshape facial animation.
  • To address the inverse problem in blendshape editing.
  • To provide artists with intuitive control over facial animation.

Main Methods:

  • Developed a direct manipulation algorithm for blendshape models.
  • Utilized blendshape sliders as a semantic parameterization.
  • Employed distance in 'slider space' for regularization of the inverse problem.
  • Minimized semantic position changes subject to direct manipulations.

Main Results:

  • Demonstrated that direct manipulation can be equivalent to multiple slider edits.
  • Showcased that slider edits can also be achieved through direct manipulation.
  • Empirically and mathematically validated the algorithm's effectiveness.

Conclusions:

  • The proposed algorithm offers a simple and effective solution for direct manipulation in blendshape facial animation.
  • Supporting both direct manipulation and slider-based editing enhances artistic control and workflow efficiency.
  • The findings confirm the utility of semantic parameterization for solving inverse problems in animation.