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170 Reverse Engineering – Recent Advances and Applications 4.2 Examples for hands-on evaluations For hands-on evaluations, we carried out two rounds of study; round 1 focuses on auto surfacing, and round 2 is for parametric solid modeling. After surveying most advanced software as discussed in Section 4.1, we selected four candidate software tools for hands-on evaluations. They are RE-based software Geomagic Studio v.11 and Rapidform XOR3; and feature-based CAD software Pro/ENGINEER Wildfire v.4 and SolidWorks 2009. As shown in Table 2, all tools support surface and solid model construction, except for Wildfire, which does not support parametric solid modeling using scanned data. Table 2. Software selected for hands-on evaluations For round 1 evaluations, we focus on auto surfacing and the software stability. In round 2, we focus on parametric solid modeling, we look for primitive feature recognition (such as cylinder, cone, etc.), parametric modeling, and model exporting to CAD packages. We selected five examples for hands-on evaluation, as listed in Table 3. Among the five examples, two are given as polygon meshes and the other three are point clouds. These five parts represent a broad range of applications. Parts like the block, tubing, and door lock are more traditional mechanical parts with regular solid features. In contrast, sheetmetal part (Model 3) is a formed part with large curvature, and the blade is basically a free-form object. Model Pictures Model 1 Block Scanned data 634,957 points Dimensions 5×3×0.5 (inch) Model 2 Tubing 589,693 polygons 125×93×17 (mm) Table 3. Examples selected for hands-on evaluations Surface Reconstruction Parametric Modeling Geomagic Studio v. 11 Shape Phase Fashion Phase Rapidform XOR3 Auto Surfacing Solid/ Surface Primitives SolidWorks 2009 Scan to 3D Scan to 3D Wildfire v. 4 Facet + Restyle Not Available Model 3 Sheetmetal 134,089 polygons 16×10×9 (inch) Model 4 Blade 252,895 points 2×3×4 (inch) Model 5 Door Lock 207,282 points 7×3×2 (inch) 4.3 Round 1: Auto surfacing In round 1 evaluation, we are interested in investigating if software tools evaluated are able to support auto surfacing; i.e., automatically constructing air-tight, accurate, and high quality surface models from scanned data. We look for the level of automation, software stability, and capabilities for editing geometric entities (such as points, meshes, and NURB patches).
A Review on Shape Engineering and Design Parameterization in Reverse Engineering Based on the evaluations, we found that all software tools evaluated are able to support surface modeling either fully automatically or close to fully automation. Table 4 summarizes the test results. The results show that Geomagic is the only software that is able to create surface models for all five examples automatically, without any user interventions. Rapidform comes close second. Rapidform is able to construct surface models for two out of the five examples fully automatically. For the remaining three examples, only minor interventions or editing from the user are required. However, SolidWorks and Wildfire are able to support only some of the examples even after spending long hours. It took extremely long time using SolidWorks or Wildfire to process some of the examples, and yet without achieving meaningful results. Software crashed without giving warning message while conducting triangulation or surface fitting. The size of the scanned data also presents problems for SolidWorks and Wildfire. They are able to support only up to about 300,000 data points. The software becomes unstable or even crashes while handling more data points. Geomagic Studio v.11 Rapidform XOR3 SolidWorks 2009 Wildfire v.4 Model 1 Block Completed (Automated) Completed (Automated) Fail (Gaps remained, shown in red) Software Crashed Model 2 Tubing Completed (Automated) Completed (Partial-auto) Software crashed Software crashed Table 4. Results of Round 1 evaluations Model 3 Sheetmetal Completed (Automated) Completed (Partial-auto) Fail (Gaps remained, shown in red) Completed (Automated) Model 4 Blade Completed (Automated) Completed (Partial-auto) Completed (Automated) Completed (Automated) 171 Model 5 Door Lock Completed (Automated) Completed (Automated) Software crashed Software crashed
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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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1. Introduction 60 Surface Reconstr
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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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