Cadalyst - May 2008 - (Page 30) casestudy Figure 4. The point cloud produced by the 3D scanning device. Figure 5. 3D image of the capital drawing, generated from the point cloud. by the scanner) chosen for this measurement was 1 mm, although a resolution as low as .1 mm is possible with this equipment. The file generated by the scanning system must be optimized using filters and tools inside the RE software. Different point clouds, which come from different measuring sessions, are aligned in the same reference system, and the duplicate points are deleted. When the measuring was completed, the 3D point cloud was transformed into a 3D mesh in STL format (figure 5). CRP then created a physical model in the company’s Windform prototype modeling material with the selective laser sintering process (figure 6). Figure 6. Scaled model of the column capital made in CRP’s Windform GF composite material. The Drawbacks The ultimate goal of this project was to measure an architectural detail of interest and to create an accurate 3D model of the original object. The system, which works by the optical triangulation principle, is able to measure only the visible areas of the object, which means that the undercuts and other small cavities are not measured. A high-resolution scanner is able to scan the surfaces by staying very close — about 100 mm — to the object it is measuring, adding to logistic problems when parts of the component being measured are difficult to access. In the case of the capital, the measuring device had to be fixed to some movable scaffolding close to the object, creating a multitude of problems because of the instability of the supporting structure. The other main disadvantage of using this technique is the high cost of the equipment, which is expected to decrease over time. Gloria Goskie is a digital media editor for Cadalyst. 30 www.cadalyst.com cadalyst May 2008 http://www.cvis.com http://www.cvis.com/go/cmbc http://www.cadalyst.com
Table of Contents Feed for the Digital Edition of Cadalyst - May 2008 Cadalyst - May 2008 Contents Editor's Window Cad Central A Solid Job in AutoCAD Today’s Power — Quad-Core Workstations Performance — Tomorrow’s Possibilities Reverse Engineering an Antique Italian Treasure Trends in Reverse Engineering NextEngine 3D Scanner — Reverse-Engineering Tool Setting CAD Standards Fight for Your Hardware Rights The Jack and Jill of Ergonomics Technology for Civil Infrastructure Cad Cartoon Issue Indexes Shortcuts and Solutions Cadalyst - May 2008 Cadalyst - May 2008 - Cadalyst - May 2008 (Page Cover1) Cadalyst - May 2008 - Cadalyst - May 2008 (Page Cover2) Cadalyst - May 2008 - Contents (Page 3) Cadalyst - May 2008 - Contents (Page 4) Cadalyst - May 2008 - Contents (Page 5) Cadalyst - May 2008 - Editor's Window (Page 6) Cadalyst - May 2008 - Editor's Window (Page 7) Cadalyst - May 2008 - Editor's Window (Page 8) Cadalyst - May 2008 - Editor's Window (Page 9) Cadalyst - May 2008 - Cad Central (Page 10) Cadalyst - May 2008 - Cad Central (Page 11) Cadalyst - May 2008 - A Solid Job in AutoCAD (Page 12) Cadalyst - May 2008 - A Solid Job in AutoCAD (Page 13) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 14) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 15) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 16) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 17) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 18) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 19) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 20) Cadalyst - May 2008 - Today’s Power — Quad-Core Workstations (Page 21) Cadalyst - May 2008 - Performance — Tomorrow’s Possibilities (Page 22) Cadalyst - May 2008 - Performance — Tomorrow’s Possibilities (Page 23) Cadalyst - May 2008 - Performance — Tomorrow’s Possibilities (Page 24) Cadalyst - May 2008 - Performance — Tomorrow’s Possibilities (Page 25) Cadalyst - May 2008 - Performance — Tomorrow’s Possibilities (Page 26) Cadalyst - May 2008 - Reverse Engineering an Antique Italian Treasure (Page 27) Cadalyst - May 2008 - Reverse Engineering an Antique Italian Treasure (Page 28) Cadalyst - May 2008 - Reverse Engineering an Antique Italian Treasure (Page 29) Cadalyst - May 2008 - Reverse Engineering an Antique Italian Treasure (Page 30) Cadalyst - May 2008 - Reverse Engineering an Antique Italian Treasure (Page 31) Cadalyst - May 2008 - Trends in Reverse Engineering (Page 32) Cadalyst - May 2008 - Trends in Reverse Engineering (Page 33) Cadalyst - May 2008 - Trends in Reverse Engineering (Page 34) Cadalyst - May 2008 - Trends in Reverse Engineering (Page 35) Cadalyst - May 2008 - NextEngine 3D Scanner — Reverse-Engineering Tool (Page 36) Cadalyst - May 2008 - NextEngine 3D Scanner — Reverse-Engineering Tool (Page 37) Cadalyst - May 2008 - Setting CAD Standards (Page 38) Cadalyst - May 2008 - Setting CAD Standards (Page 39) Cadalyst - May 2008 - Fight for Your Hardware Rights (Page 40) Cadalyst - May 2008 - Fight for Your Hardware Rights (Page 41) Cadalyst - May 2008 - The Jack and Jill of Ergonomics (Page 42) Cadalyst - May 2008 - The Jack and Jill of Ergonomics (Page 43) Cadalyst - May 2008 - Technology for Civil Infrastructure (Page 44) Cadalyst - May 2008 - Technology for Civil Infrastructure (Page 45) Cadalyst - May 2008 - Technology for Civil Infrastructure (Page 46) Cadalyst - May 2008 - Issue Indexes (Page 47) Cadalyst - May 2008 - Issue Indexes (Page 48) Cadalyst - May 2008 - Issue Indexes (Page 49) Cadalyst - May 2008 - Shortcuts and Solutions (Page 50) Cadalyst - May 2008 - Shortcuts and Solutions (Page Cover3A) Cadalyst - May 2008 - Shortcuts and Solutions (Page Cover3B) Cadalyst - May 2008 - Shortcuts and Solutions (Page Cover4)
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