Weihang Zhu - Academia.edu (original) (raw)

Papers by Weihang Zhu

Research paper thumbnail of The OpenHaptics(TM) Toolkit: A Library for Adding 3D Touch^(TM) Navigation and Haptics to Graphics Applications

The OpenHaptics™ toolkit is a haptics library developed by SensAble Technologies, Inc®. It is pat... more The OpenHaptics™ toolkit is a haptics library developed by SensAble Technologies, Inc®. It is patterned after the OpenGL® API, making it familiar to graphics programmers and facilitating integration with existing OpenGL applications. OpenHaptics is composed of two layers: Haptic Device API (HDAPI) and Haptic Library API (HLAPI). HDAPI provides low-level access to the haptic device. HLAPI provides advanced haptic rendering capability. HDAPI and HLAPI are built on top of the PHANTOM® Device Drivers (PDD), the device drivers for PHANTOM series of haptic devices.

Research paper thumbnail of A Visibility Sphere Marching algorithm of constructing polyhedral models for haptic sculpting and product prototyping

Robotics and Computer-integrated Manufacturing, 2005

... 1(e) uses a higher resolution (22,500 elements) Dexel volume model to represent the example .... more ... 1(e) uses a higher resolution (22,500 elements) Dexel volume model to represent the example ... However, by using the planar contours as the intermediate representation, it loses the topology ... Hence, when there are several contours in a plane, the algorithms of conversion from ...

Research paper thumbnail of Dexel-based force-torque rendering and volume updating for 5DOF haptic product prototyping and virtual sculpting

Computers in Industry, 2004

This paper presents new techniques of Dexel-based force-torque rendering and volume-updating for ... more This paper presents new techniques of Dexel-based force-torque rendering and volume-updating for haptic virtual sculpting of complex surfaces with a developed 5-DOF (degree of freedom) haptic interface. In the proposed methodology, 5-axis tool motion and analytical tool swept volume are formulated for updating the virtual stock material, which is represented with the Dexel volume model. Based on the tool motion analysis, a Dexel-based collision detection method and a force-torque feedback algorithm are proposed for virtual sculpting. A lab-built 5-DOF force-torque output haptic interface system is developed for the proposed haptic sculpting system. With the proposed methodology, a user can virtually sculpt a volume stock to get an intuitive design by using the haptic interface. From the haptic sculpting system, both the corresponding tool motion of the creative process and the sculpted model can be recorded and output. The output STL models of the haptic sculpting system can be processed for machining planning. Based on the proposed techniques, hardware and software implementation of the haptic sculpting system as well as the illustrative examples are also presented in this paper. # Fig. 2. Data structure of Dexel volume models and Dexel-updating processing. (a) Linked list data structure of Dexel elements, (b) treating Dexels as vectors.

Research paper thumbnail of Five-axis pencil-cut planning and virtual prototyping with 5DOF haptic interface

Computer-aided Design, 2004

In this paper, techniques of 5-axis pencil-cut machining planning with a 5-DOF (degree of freedom... more In this paper, techniques of 5-axis pencil-cut machining planning with a 5-DOF (degree of freedom) output haptic interface are presented. Detailed techniques of haptic rendering and tool interference avoidance are discussed for haptic-aided 5-axis pencil-cut tool path generation. Five-axis tool path planning has attracted great attention in CAD/CAM and NC machining. For efficient machining of complex surfaces, pencil-cut uses relatively smaller tools to remove the remaining material at corners or highly curved regions that are inaccessible with larger tools. As a critical problem for 5-axis pencil-cut tool path planning, the tasks of tool orientation determination and tool collision avoidance are achieved with a developed 5-DOF haptic interface. A Two-phase rendering approach is proposed for haptic rendering and force-torque feedback calculation with haptic interface. A Dexel-based volume modeling method is developed for global tool interference avoidance with surrounding components in a 5-axis machining environment. Hardware and software implementation of the haptic pencil-cut system with practical examples are also presented in this paper. The presented technique can be used for CAD/CAM, 5-axis machining planning and virtual prototyping. q

Research paper thumbnail of Material side tracing and curve refinement for pencil-cut machining of complex polyhedral models

Computer-aided Design, 2005

In this paper, a new Material-Side-Tracing method and a pencil-cut curve refinement technique are... more In this paper, a new Material-Side-Tracing method and a pencil-cut curve refinement technique are proposed for 3-axis pencil-cut path generation. Pencil-cut machining has been used to remove remaining material at highly curved regions or corners after the finishing process. Procedures of evaluating and extracting valid pencil-cut points are developed by taking practical cases into account. With the strategy of using material-side information in the tracing process, smooth and clean pencil-cut curves can be generated even if the actual adjacent pencilcut curves are very close. A technique of pencil-cut curve refinement is presented to overcome the limitation due to the discrete CL-net intervals, and the smooth pencil-cut paths are made complete at sharp corners. Computer implementation and practical examples are also presented in this paper. The proposed techniques can be used in the CAD/CAM systems to generate pencil-cut paths for machining complex polyhedral models. q

Research paper thumbnail of The OpenHaptics(TM) Toolkit: A Library for Adding 3D Touch^(TM) Navigation and Haptics to Graphics Applications

The OpenHaptics™ toolkit is a haptics library developed by SensAble Technologies, Inc®. It is pat... more The OpenHaptics™ toolkit is a haptics library developed by SensAble Technologies, Inc®. It is patterned after the OpenGL® API, making it familiar to graphics programmers and facilitating integration with existing OpenGL applications. OpenHaptics is composed of two layers: Haptic Device API (HDAPI) and Haptic Library API (HLAPI). HDAPI provides low-level access to the haptic device. HLAPI provides advanced haptic rendering capability. HDAPI and HLAPI are built on top of the PHANTOM® Device Drivers (PDD), the device drivers for PHANTOM series of haptic devices.

Research paper thumbnail of A Visibility Sphere Marching algorithm of constructing polyhedral models for haptic sculpting and product prototyping

Robotics and Computer-integrated Manufacturing, 2005

... 1(e) uses a higher resolution (22,500 elements) Dexel volume model to represent the example .... more ... 1(e) uses a higher resolution (22,500 elements) Dexel volume model to represent the example ... However, by using the planar contours as the intermediate representation, it loses the topology ... Hence, when there are several contours in a plane, the algorithms of conversion from ...

Research paper thumbnail of Dexel-based force-torque rendering and volume updating for 5DOF haptic product prototyping and virtual sculpting

Computers in Industry, 2004

This paper presents new techniques of Dexel-based force-torque rendering and volume-updating for ... more This paper presents new techniques of Dexel-based force-torque rendering and volume-updating for haptic virtual sculpting of complex surfaces with a developed 5-DOF (degree of freedom) haptic interface. In the proposed methodology, 5-axis tool motion and analytical tool swept volume are formulated for updating the virtual stock material, which is represented with the Dexel volume model. Based on the tool motion analysis, a Dexel-based collision detection method and a force-torque feedback algorithm are proposed for virtual sculpting. A lab-built 5-DOF force-torque output haptic interface system is developed for the proposed haptic sculpting system. With the proposed methodology, a user can virtually sculpt a volume stock to get an intuitive design by using the haptic interface. From the haptic sculpting system, both the corresponding tool motion of the creative process and the sculpted model can be recorded and output. The output STL models of the haptic sculpting system can be processed for machining planning. Based on the proposed techniques, hardware and software implementation of the haptic sculpting system as well as the illustrative examples are also presented in this paper. # Fig. 2. Data structure of Dexel volume models and Dexel-updating processing. (a) Linked list data structure of Dexel elements, (b) treating Dexels as vectors.

Research paper thumbnail of Five-axis pencil-cut planning and virtual prototyping with 5DOF haptic interface

Computer-aided Design, 2004

In this paper, techniques of 5-axis pencil-cut machining planning with a 5-DOF (degree of freedom... more In this paper, techniques of 5-axis pencil-cut machining planning with a 5-DOF (degree of freedom) output haptic interface are presented. Detailed techniques of haptic rendering and tool interference avoidance are discussed for haptic-aided 5-axis pencil-cut tool path generation. Five-axis tool path planning has attracted great attention in CAD/CAM and NC machining. For efficient machining of complex surfaces, pencil-cut uses relatively smaller tools to remove the remaining material at corners or highly curved regions that are inaccessible with larger tools. As a critical problem for 5-axis pencil-cut tool path planning, the tasks of tool orientation determination and tool collision avoidance are achieved with a developed 5-DOF haptic interface. A Two-phase rendering approach is proposed for haptic rendering and force-torque feedback calculation with haptic interface. A Dexel-based volume modeling method is developed for global tool interference avoidance with surrounding components in a 5-axis machining environment. Hardware and software implementation of the haptic pencil-cut system with practical examples are also presented in this paper. The presented technique can be used for CAD/CAM, 5-axis machining planning and virtual prototyping. q

Research paper thumbnail of Material side tracing and curve refinement for pencil-cut machining of complex polyhedral models

Computer-aided Design, 2005

In this paper, a new Material-Side-Tracing method and a pencil-cut curve refinement technique are... more In this paper, a new Material-Side-Tracing method and a pencil-cut curve refinement technique are proposed for 3-axis pencil-cut path generation. Pencil-cut machining has been used to remove remaining material at highly curved regions or corners after the finishing process. Procedures of evaluating and extracting valid pencil-cut points are developed by taking practical cases into account. With the strategy of using material-side information in the tracing process, smooth and clean pencil-cut curves can be generated even if the actual adjacent pencilcut curves are very close. A technique of pencil-cut curve refinement is presented to overcome the limitation due to the discrete CL-net intervals, and the smooth pencil-cut paths are made complete at sharp corners. Computer implementation and practical examples are also presented in this paper. The proposed techniques can be used in the CAD/CAM systems to generate pencil-cut paths for machining complex polyhedral models. q