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Proceedings of CAD'15, 2015, 303-308
Generating a Reference Model of the Surface with a Hole for Downstream Process

Gulibaha Silayi, Katsutsugu Matsuyama, Kouichi Konno, Iwate University, Japan
Tsutomu Kinoshita, Fukui University of Technology, Japan

Abstract. 3D data designed with 3D CAD systems are becoming vital communication tools between the design process and downstream processes. Quickly distributing 3D data to downstream departments can dramatically enhance their work efficiency. In the downstream department, 3D data received from a design department can be effectively utilized as a reference model for the creation of various process procedures and technical documents, such as creating visual assembly instructions, creating product manuals and product catalogs. In such works, clear visual communication for ease of understanding is important. However, size of 3D CAD data for expressing precise forms tends to big and takes long time to compute, therefore it may interfere with communication among users.  In addition, since the internal data structures and tolerance do not coincide in each system, the intended shape model for downstream distribution may not be delivered. If the shape delivery fails in one system, the shape should be modified by using any methods to suit for the system. To overcome the problem, direct modeling which modifies the curve mesh is effective. For example, Fig. 1 shows the gap between two trimmed surfaces which was caused by different tolerance. In direct modeling, modification of a trimmed surface has the restriction where boundary edges must lie on the surface within a certain tolerance.

Keywords. B-spline surface, Gregory surface, Surface approximation, Curve mesh filling, Geometric continuity

DOI: 10.14733/cadconfP.2015.303-308