COMPUTATIONAL STEERING OF MOLECULAR DYNAMICS SIMULATION USING PIT

在过去的几年里，我们已经开发了算法， 使用多边形表示的模型的自动简化。 模型中的对象可以用自动生成的 各种复杂性的“细节级别”，允许权衡 对速度的忠诚。 在过去的一年里，研究生乔纳森 科恩继续工作的多面体极小开始由阿米塔布 Varshney博士学位的一部分。工作 科恩，瓦什尼， 等人发表在《计算机图形学》上， 外地 科恩继续工作，使简化 通过保留曲面法线和其他 特性. 我们的主要贡献包括生成 并测量这些细节层次的质量。 这种品质是 根据三个外观属性测量：表面位置， 曲面曲率和曲面颜色。 最终，用户可以 控制保真度/速度权衡使用一个单一的，直观的， 屏幕空间容错。 我们的算法使用局部和全局 表面偏差的误差度量。 为了保持整体 外观，我们将输入表面模型转换为表示 它对外观属性进行采样，并将 纹理和法线贴图中的颜色和法线。 简化 算法还采用纹理偏差度量，这保证了 这些地图的移动不超过用户指定的 屏幕上的像素。 这些算法已成功应用于 一些型号。 重要性：这些技术也适用于 电子密度图中的等值线面。 计划：Cohen is 在明年完成他的论文。 他有另一个 1998年7月号上发表的主要论文， 计算机制图.

Over the last few years, we have developed algorithms for automatic simplification of models represented using polygons. Objects in a model may be replaced with automatically-generated "levels of detail" of various complexities, allowing a trade-off of fidelity for speed. During the past year, graduate student Jonathan Cohen continued work on the polyhedral minimizer started by Amitabh Varshney as part of his Ph.D. work. A major paper by Cohen, Varshney, et al. was published in Computer Graphics, the premier publication of the field. Cohen has continued the work to make the simplified surfaces look better by preserving surface normals and other properties. Our main contributions include algorithms for generating and measuring the quality of these levels of detail. This quality is measured in terms of three appearance attributes: surface position, surface curvature, and surface color. Ultimately, the user can control the fidelity/speed trade-off using a single, intuitive, screen-space error tolerance. Our algorithms use local and global error metrics for surface deviation. To preserve the overall appearance, we convert the input surface model to a representation that decouples the sampling of appearance attributes and stores the color and normals in texture and normal maps. The simplification algorithms also employ a texture deviation metric, which guarantees that these maps shift by no more than a user-specified number of pixels on the screen. These algorithms have been successfully applied to a number of models. Significance: The techniques also apply to isocontour surfaces in electron density maps. Plans: Cohen is completing his dissertation in the coming year. He has had another major paper accepted for publication in the July, 1998, issue of Computer Graphics.