虚拟现实中三维曲面上曲线的空中绘制
Mid-Air Drawing of Curves on 3D Surfaces in Virtual Reality
摘要：
在沉浸式环境（增强现实和虚拟现实）中，可以直接在半空中绘制复杂的3D曲线。然而，在3D虚拟对象的表面上精确地绘制半空中笔划是困难的;需要将半空中笔划投影到用户“预期的”表面曲线上。我们提出了第一个详细的调查的基本问题，在VR的三维中风投影。评估的设计要求的实时绘制曲线的三维物体在VR其次是定义和分类的多种技术的三维笔画投影。我们分析了这些方法的优点和缺点，从理论上和通过实际的试点测试。然后，我们正式评估了两个最有前途的技术spraycan和模仿与20个用户在VR。研究表明，我们的新的笔画模仿投影算法的定性和定量用户偏好。我们进一步说明了中风模仿的有效性和实用性，绘制复杂的三维曲线的表面上的各种艺术和功能设计应用。
英文摘要：
Complex 3D curves can be created by directly drawing mid-air in immersive environments (Augmented and Virtual Realities). Drawing mid-air strokes precisely on the surface of a 3D virtual object, however, is difficult; necessitating a projection of the mid-air stroke onto the user "intended" surface curve. We present the first detailed investigation of the fundamental problem of 3D stroke projection in VR. An assessment of the design requirements of real-time drawing of curves on 3D objects in VR is followed by the definition and classification of multiple techniques for 3D stroke projection. We analyze the advantages and shortcomings of these approaches both theoretically and via practical pilot testing. We then formally evaluate the two most promising techniques spraycan and mimicry with 20 users in VR. The study shows a strong qualitative and quantitative user preference for our novel stroke mimicry projection algorithm. We further illustrate the effectiveness and utility of stroke mimicry, to draw complex 3D curves on surfaces for various artistic and functional design applications.
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