Imagine Internships

(2011-2012)


Animation of creased paper

picture master
Static virtual creased paper from [1]

Advisors

Damien Rohmer, IMAGINE team

E-mail : damien.rohmer@imag.fr

Context

Altough physically-based simulation has become very popular to model complex surface deformations such as cloth, it is still not applicable to generate animations of creased paper. As a result, this standard material in every-day life almost never appears in Computer Graphics applications such as movies or video games. Animating creased paper brings two main chalenges: First, such surface needs to be deformed while preserving its length in every direction with respect to its original pattern. Secondly, the surface exhibits sharp features that may appears on the surface, and which are not commonly handled in numerical simulators.

Objectives

The objective of this internship is to explore a way of combining standard cloth simulator approches with strong geometrical constraints such as length preservation.
Geometrical approches have already been succesfully used [1] to model static surfaces, but animating such surface is still an open problem. As a starting point, already existing cloth simulation [2] could be used to generate an animated surface. Then, local strech estimation [3] could be used to automatically detect regions that fail to satisfy length contraint. Introducing geometrical knowledge on creased paper based on mechanical studies [4] could help to locally correct the geometry of the surface and modify the parameters of the numerical simulation accordingly to generate a plausible animation of creased paper.

Keywords

Paper, isometry preservation, numerical simulation, creases.

References

[1] Damien Rohmer, Marie-Paule Cani, Stefanie Hahmann, B. Thibert. Folded paper geometry from 2D pattern and 3D contour. Eurographics (Short paper), 2011.

[2] Huamin Wang, James O'Brien, Ravi Ramamoorthi. Multi-Resolution Isotropic Strain Limiting. ACM TOG, Proceedings of ACM SIGGRAPH Asia, 2010.

[3] Damien Rohmer, Tiberiu Popa, Marie-Paule Cani, Stefanie Hahmann, Alla Sheffer. Animation Wrinkling: Augmenting Coarse Cloth Simulations with Realistic-Looking Wrinkles. ACM TOG, Proceedings of ACM SIGGRAPH Asia, 2010.

[4] J. Amirbayat and J. W. Hearle. The complex buckling of flexible sheet materials. Part I. Theoretical approach. International Journal of Mechnical Sciences, vol.28 1986