Data-driven modeling and animation of outdoor trees through interactive approach
Data-driven modeling and animation of outdoor trees through interactive approach
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DOI：
10.1007/s00371-017-1377-6
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发表时间：
2017-06
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影响因子：
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通讯作者：
Shaojun Hu;Zhiyi Zhang;Haoran Xie;T. Igarashi
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文献类型：
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作者：
Shaojun Hu;Zhiyi Zhang;Haoran Xie;T. Igarashi
树木的计算机动画在电影制作、视频游戏和虚拟现实等领域有着广泛的应用。基于物理的方法是可行的解决方案，以实现良好的近似树的运动。然而，在真实的世界中逼真地动画特定的树仍然是一个挑战，因为基于物理的方法依赖于难以测量的动态特性。在本文中，我们提出了一种低成本的交互式方法来建模和动画户外树木的照片和视频，可以使用智能手机或手持相机捕捉。提出了一种基于极线约束的交互式编辑方法，用于从照片中重建细节树枝。为了跟踪树枝和树叶的运动，提出了一种半自动跟踪方法，允许用户交互式地纠正误跟踪的功能。然后，树枝和树叶的物理参数估计使用快速傅立叶变换，这些属性被应用到一个简化的基于物理的模型，以生成动画的树木与各种外力。我们比较了几个例子的动画结果与参考视频，并证明我们的方法可以实现逼真的树动画。
Computer animation of trees has widespread applications in the fields of film production, video games and virtual reality. Physics-based methods are feasible solutions to achieve good approximations of tree movements. However, realistically animating a specific tree in the real world remains a challenge since physics-based methods rely on dynamic properties that are difficult to measure. In this paper, we present a low-cost interactive approach to model and animate outdoor trees from photographs and videos, which can be captured using a smartphone or handheld camera. An interactive editing approach is proposed to reconstruct detailed branches from photographs by considering an epipolar constraint. To track the motions of branches and leaves, a semi-automatic tracking method is presented to allow the user to interactively correct mis-tracked features. Then, the physical parameters of branches and leaves are estimated using a fast Fourier transform, and these properties are applied to a simplified physics-based model to generate animations of trees with various external forces. We compare the animation results with reference videos on several examples and demonstrate that our approach can achieve realistic tree animation.