勾画式泊松网格编辑

结合勾画式自由变形方法简单直观易用的优点和基于微分方程的网格变形方法能够保持形变物体几何细节的性质,提出一种勾画式的泊松网格编辑方法.通过允许目标勾画线和参照勾画线不必位于相同的相机平面,把原有的二维勾画变形推广至三维,并提出了一组完整的变形操作.这些变形操作根据参照勾画线与目标勾画线决定了一系列的局部变换,并由这些局部变换产生出用户希望的梯度场,最终根据用户需要的梯度场重建出变形后的三维模型.丰富的编辑实例表明了该方法具有直观便捷的交互特点.

Sketch-Based Poisson Mesh Editing

In this paper, we propose a sketch-based Poisson mesh editing approach that inherits advantages from Sketch-based freeform deformation and PDE-based methods. Sketch-based free-form deformation methods have the advantage that they are simple, intuitive and easy-to-use, while PDE-based methods can keep geometry details when models are being deformed. Although the sketch user interface is basically 2-dimensional, we extend this editing metaphor to 3D by allowing the target sketch to lie on the viewing plane different to that contains the reference sketch. At the same time, a complete set of deformation operators are presented based on 3D sketches. These deformation operators determine local transforms from the reference sketch and the target sketch and use these local transforms to generate the desired gradient fields which finally guide the reconstructive process of the deformed model. We demonstrate the efficiency and effectiveness of our algorithm with comprehensive editing results.