RESEARCH AND DESIGN ABOUT VERSATILE 3D-CAD ENGINE FOR CONSTRUCTION
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我が国の建設事業においては,CALS/ECや情報化施工,生産性向上のために3次元データを利用する環境を構築することは重要な課題であるが,その要求を満たす3次元CADが存在しない.そのため,国産の3次元CADの開発を支援することを目的とした,汎用3次元CADエンジンの開発が求められている. そこで本研究では,建設事業において3次元CADを迅速かつ低コストに導入し,これを活用できる環境を構築するために,汎用3次元CADエンジンを設計するための調査研究を行った.ここでは,3次元CADの利用場面,標準化動向,汎用3次元CADエンジンに付随するシーズ,既存製品,IT要素技術について調査し,汎用3次元CADエンジンに対する要求を明らかにした.Due to their 3D nature, many CAD B-Spline surfaces are difficult to design and edit with traditional 2D interfaces, e.g., a 2D mouse.Based on an energy minimization method or variational B-Spline technique, the paper presents the technique of using a haptic device to design B-Spline surfaces.Under complex constraints and without any pre-calculation, the variational B-Spline technique used in the system can solve virtually all practical B-Spline surfaces in a matter of milliseconds.Such results are much more efficient and powerful than previous work in the variational B-Spline field.By using a haptic interface, the system allows a user in a natural 3D environment to directly manipulate/design constraints, e.g., points and curves, and in real time, the system generates energy-minimization B-Spline surfaces in response to haptic operations.The discussed technique delivers all the performance and capacity required for using haptics to design high-quality B-Spline surfaces, and haptic-based surface operations provide a powerful method for designing B-Spline surfaces.
Computer-aided manufacturing
Technology CAD
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