Interactive implicit modelling

研究的重点是建立应用于计算机辅助的计算机模型的新方法 外科、医学教育、动画和电子游戏。 一种称为隐式建模的建模方法将模型描述为标量场中的等值面。这类似于高度场中的一组等高线的想法。等高线集合描述了一个曲面。可以生成实体模型，与使用三角形网格的更常见的方法相比，实体模型显示出几个优点。隐含模型是实心的，很容易从内到外辨别，并找到例如人体器官模型和虚拟刀具之间的接触。这些模型对于描述具有锋利边缘的人造对象和更有机的对象都非常有用。 使用我们早期的研究结果，可以用非常少的数据来描述非常复杂的模型，从而能够在网络上传输，从而使这种模型在用户地理上相距很远的协作情况下很有用。例如，虚拟手术。早期的工作允许从用户草图快速制作复杂(拓扑和几何)模型的原型，我们仍然在寻找从简单输入生成高度复杂模型的更好方法。 目前有几个缺点阻碍了隐式建模的广泛接受。与基于网格的方法相比，从扫描数据生成隐式模型是困难的，并且可视化速度较慢。需要研究探索新的领域功能，以允许更好地控制模型的形状，特别是在动画期间。在这项工作中，目的是研究克服这些问题的方法，使隐式建模在指定的应用领域成为一种有用的方法。

The research focus is on new methods for building computer models for application in computer assisted surgery, medical education, animation, and electronic games. A modelling methodology known as implicit modelling, describes a model as an iso-surface in a scalar field. This is similar to the idea of a set of contours in a height field. The collection of contours describes a surface. Solid models can be produced that exhibit several advantages over the more usual method that use triangle meshes. Implicit models are solid, it is easy to tell inside from outside and find for example contact between models of a human organ and a virtual knife. These models are very useful for describing both manufactured objects that have sharp edges and more organic objects. Using results of our earlier research it is possible to describe very complex models with very little data, enabling transmission over a network, thus making such models useful in cooperative situations where users are geographically far apart. For example virtual surgery. Earlier work allowed rapid prototyping of complex (topologically and geometrically) models from user sketches and we are still finding better methods of producing highly complex models from simple input. There are currently several disadvantages that prevent wide acceptance of implicit modelling. it is difficult to generate implicit models from scan data, and visualization is slow compared to mesh based methods. Research is required to explore new field functions that allow for better control over the shape of the model particularly during animation. In this work the intention is to investigate methods to overcome these problems to make implicit modelling a useful method in the application areas indicated.