Research Initiation: Automatic Conversion of Wireframe Geometric Models to a Boundary Representation

研究启动：线框几何模型到边界表示的自动转换

• 批准号: 8910101
• 负责人: Warren Waggenspack
• 金额: $ 6.91万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8910101&HistoricalAwards=false
• 关键词: Research; Initiation; Automatic; Conversion; Wireframe

The objective of this project is the development of new and improved algorithms for converting wireframe geometric models to a solid boundary representation. The complete, unambiguous geometric description of three-dimensional volumes provided by the solid representation can be used to model mechanical parts or any solid object. Solid modeling holds the promise of complete computer based prototyping of mechanical parts and assemblies; however, it has not yet attained the widespread commercial application once envisioned. This is due in part to the cumbersome interaction often required to model complex geometries and assemblies. The wireframe to solid conversion addresses this problem as wireframe creation bears a strong resemblance to traditional drafting methodologies and provides a relatively familiar and natural user interface. It also supplies the mechanism for transforming a large existing industrial wireframe database into a more robust solid model format. A topologically based divide and conquer strategy will be investigated to develop a new algorithm for extracting accurate face topology from wireframe models and alleviate the current restriction to manifold objects which contain no holes (genus zero objects). Criteria will be established for automatic surfacing detailing, i.e. extracting the geometric information (surface equation) associated with each face of an object in order to complete the solid model.

该项目的目标是开发新的和改进的算法，用于将线框几何模型转换为实体边界表示。由实体表示提供的三维体积的完整、明确的几何描述可用于机械零件或任何实体物体的建模。实体建模具有完整的基于计算机的机械零件和组件原型的承诺；然而，它还没有达到曾经设想的广泛的商业应用。这在一定程度上是由于对复杂的几何形状和装配进行建模通常需要繁琐的交互。线框到实体的转换解决了这个问题，因为线框的创建与传统的绘图方法非常相似，并且提供了一个相对熟悉和自然的用户界面。它还提供了将大型现有工业线框数据库转换为更健壮的实体模型格式的机制。研究了一种基于拓扑的分而治之策略，开发了一种新的从线框模型中提取准确的人脸拓扑的算法，并减轻了目前对不包含孔的流形对象（零属对象）的限制。将建立自动曲面细节的标准，即提取与物体每个面相关的几何信息（曲面方程），以完成实体模型。