Yuki Koyama

View-Dependent Control of Elastic Rod Simulation
for 3D Character Animation

Yuki Koyama, Takeo Igarashi
SCA '13


This paper presents view-dependent control of elastic rod simulation for 3D character animation. Elastic rod simulation is often used in character animation to generate motion of passively deforming body parts such as hair, ear, and whiskers. Our goal is to allow artistic control of the simulation in a view-dependent way, for example to move a hair strand so that it does not hide the eye regardless of the view direction. To achieve this goal, the artist defines several example rest poses of the rod in preparation, each of which is associated with a particular view direction. In run time, the system computes the current rest pose by blending the example rest poses associated with the view directions near the current view direction, and then pulls the pose to the current rest pose. Technical contribution is in the formulation of example-based rod simulation using view direction as an input, and an algorithm to suppress undesirable increase of momentum caused by dynamically changing rest poses.


Demo Programs

Here, we provide the "Bunny" demo programs. Please choose the one fit for your environment. (07/15/2013 update)






We would like to thank Yasunori Harada and Nobuyuki Umetani for many useful discussions, and anonymous reviewers for their helpful comments. We also thank Yamamoto and Kio for their model data and the permission for use of them, Crypton Future Media, Inc. for the permission for use of the character, Hatsune Miku, and Blender Foundation for the Bunny data under a Creative Commons Attribution 3.0 License. This project was funded in part by grants from the Japanese Information-Technology Promotion Agency (IPA).

The 3D model data

The characters