We introduce a method that localizes the direct manipulation of blendshape models for facial animation with a customized sketch-based interface. Direct manipulation methods address the problem of cumbersome weight editing process using the traditional tools with a practical “pin-and-drag” operation directly on the 3D facial models. However, most of the direct manipulation methods have a global deformation impact, which lead to unintuitive and unexpected results. To this end, we propose a new way to localize the theory of direct manipulation method using geodesic circles for confining the edits to the local geometry. Inspired by artists’ brush painting on canvas, we additionally introduce a sketch-based interface as an application that provides direct manipulation and produces expressive facial poses efficiently and intuitively. Our method allows the artists to simply sketch directly onto the 3D facial model and automatically produces the expeditious manipulation until the desired facial pose is obtained. We show that localized blendshape direct manipulation has the potential to reduce the time-consuming blendshape editing process to an easy freehand stroke drawing. Finally, we present a wide range of facial poses on various models that are created rapidly using our method.

我们介绍了一种方法，该方法使用定制的基于草图的界面来本地化用于面部动画的blendshape模型的直接操作。直接操纵方法使用传统工具直接在3D面部模型上进行实用的“固定和拖动”操作，解决了繁琐的权重编辑过程的问题。但是，大多数直接操纵方法都具有全局变形影响，这会导致不直观和意外的结果。为此，我们提出了一种新方法，可以使用测地线将直接操作方法的理论局限在局部几何图形中。受艺术家在画布上的画笔绘画启发，我们另外引入了基于草图的界面，该应用程序可提供直接操作并有效且直观地产生表情丰富的面部姿势。我们的方法允许艺术家简单地直接在3D面部模型上绘制草图，并自动进行快速操作，直到获得所需的面部姿势为止。我们表明，本地化的blendshape直接操纵具有将耗时的blendshape编辑过程减少为简单的手绘图的潜力。最后，我们介绍了使用我们的方法快速创建的各种模型上的各种面部姿势。