Real-time dynamic wrinkles

This paper proposes a new method for designing dynamic wrinkles that appear and disappear according to the underlying deformation of tissues. The user positions and orients wrinkling tools on a mesh. During animation, geometric wrinkles are generated in real-time in the regions covered by the tools, mimicking resistance to compression of tissues. The wrinkling feature can be added to any existing animation. When the local resolution of the mesh is not sufficient, our tool refines it according to the wrinkle's finest feature. As our results show, the technique can be applied to a variety of situations such as facial expression wrinkles, joint wrinkles or garment wrinkles.

1. Introduction

Although well designed and animated in recent 3D animation movies [3], digital humans are not fully satisfying since they lack visually important details like wrinkles. Apart from some expression wrinkles, modeled with time and effort, their skin remains smooth whatever their body deformations. This is particularly annoying near joints, when the wrist bends for example. It's also a problem in the animation of virtual garments where physically-based simulation is too costly to be applied in real-time to every piece of cloth or to a fine mesh, especially in video games.