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168 4. Engineering software evaluations Reverse Engineering – Recent Advances and Applications The key criteria for the software evaluations are the capabilities of supporting automatic surface construction from point clouds and parametric solid modeling. We did the first screening on nine leading software tools that are commercially available. This screening was carried out based on the information provided in product brochure, technical reports (for example, Siddique, 2002; Chang et al., 2006), thesis (for examle, Gibson, 2004), company web sites, on-line software demo, case study reports, etc. After the screening, we acquired four tools and conducted hands-on evaluations, using five industrial examples. With this, we are able to identify pros and cons in each software tool, make a few observations, and conclude the study. 4.1 Software screening After extensive research and development in the past decade, software tools for reverse engineering have made impressive advancement. In general, these tools can be categorized into two groups, feature-based and RE-based. The feature-based CAD packages, such as Pro/ENGINEER, SolidWorks, and CATIA, emphasize recovering the original design intents of the parts. Following standard CAD capabilities, such as sketching, extrusion, and Boolean operations, designers are able to create parts with design intents recovered. On the contrary, RE-based packages; such as Geomagic, Rapidform, and Paraform, focus on reconstructing the geometry of the objects from scanned data, usually in the form of NURB surfaces. RE-based packages offer excellent capabilities in editing points, creating meshes, and generating NURB surfaces. In addition, the display performance of mass data offered by the RE-based package is far better than the feature-based CAD software; that is, in the context of reverse engineering. In this study, we looked for two key engineering capabilities; i.e., surface construction and parametric solid modeling from a point cloud or a polygon mesh. All feature-based and REbased software tools offer some capabilities for surface constructions. However, manually constructing curves and surfaces from point clouds or polygon meshes are tedious and extremely time consuming. It is critical that a serious RE software must offer auto surfacing; i.e., allowing for creating air-tight, high accuracy, and high quality surface models with only a few button clicks. On the other hand, constructing solid models has to be carried out in an interactive manner, allowing designers to recover original design intents. Software must offer adequate capabilities to assist designers to sketch section profiles and create solid features efficiently, without directly dealing with point clouds or polygon meshes. Certainly, the software will have to be stable and capable of handling massive data. Millions of point data need huge computer resources to process. Zoom, pan or rotate the object, for example, on the screen may take time for software to respond. Speed is the key for modern RE-based software. We are essentially searching for software that offers auto surfacing and parametric modeling capabilities with fast and stable performance. In addition, several software related criteria are defined, as listed in Table 1. These criteria are categorized into four groups, (1) general capabilities, such as speed; (2) generation of NURB models, including auto surfacing and geometric entity editing capabilities; (3) generation of solid models, including section profiling and parametric capabilities; and (4) usability. From Table 1, we observe that most surveyed software offers basic capabilities for editing and manipulating points, polygon meshes and NURB curves and surfaces. Particularly, we found both Geomagic and Rapidform support auto surfacing. Solid modeling using scanned
A Review on Shape Engineering and Design Parameterization in Reverse Engineering data can be commonly achieved by creating section sketches from polygon meshes and following feature creating steps similar to CAD packages. Based on the survey, Rapidform is found the only software that supports parametric solid modeling. For hands-on evaluations, we selected Geomagic and Rapidform, in addition to a few CAD packages. Table 1. A summary of commercial software tools surveyed 169
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REVERSE ENGINEERING - RECENT ADVANC
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Contents Preface IX Part 1 Software
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Preface Introduction In the recent
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Preface XI and con’s related to t
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Preface XIII the step-by-step appli
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Part 1 Software Reverse Engineering
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4 Reverse Engineering - Recent Adva
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10 Reverse Engineering - Recent Adv
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58 2. Model driven architecture: An
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62 Fig. 1. Model, metamodels and tr
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100 Reverse Engineering - Recent Ad
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108 Table 1. Number of smoothers an
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238 5. Summary and discussions Reve
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268 Fig. 6. A closed polygon mesh r
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272 3. Results Reverse Engineering
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