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Second Work meeting with Dr Duwe in Lindau


Labour Day at Duwe 3D Software & Consulting

To check if the ModelMaker SAB2 files could be read by PolyWorks, we visited Dr Duwe in Lindau again on 1 May 2003. With his help, we managed to load the ModelMaker files, create a new grid for all measured points with a regular 0.4 mm distance between all points, and convert these organized point clouds into meshes, which were stored as PolyWorks PIF format files (PolyWorks Interchange Format) (Ill.1).

After these steps, these mesh files can be worked with the usual PolyWorks tools. In this format, the ModelMaker data can also be combined with the data produced by the Breuckmann sensors, to create a complete, combined model from various sources.


Using IMAlign , the fitting of the scan stripes acquired with the ModelMaker XP/Faro Gold Arm equipment data could be noticeable improved. After only two iterations, the scan stripes were intertwined much better (Ill. 2) The improvement could be checked by measuring the fitting quality in PolyWorks Inspector. Green and turquoise areas indicate optimal fitting; only very few cleavages remain (orange and red areas) - with red areas indicating a deviation as small as of 0.4 mm (Ill. 3).

We were also able to inspect any remaining small holes, for example between the fingers of the sculpture. During our session, Dr Duwe demonstrated us again how such minor deficiencies can be repaired using PolyWorks IMEdit (Ill. 6 and 7). The newest version V.8 even allows for automatic filling of holes by means of curved Béziers surfaces. By masking and  isolating single parts of the sculpture, we we able to view and edit single surfaces that normally are occluded by other parts.

A closer view of our virtual model also revealed a series of very slight artefacts, e.g. traces of uneveness in the surface of single scan stripes, mainly caused by a - very small - slackness of the Faro Gold Arm during the scan movement (Ill. 8 and 9). Although such deviations from the ideal plane amounted only to ca. ±20 microns, we hoped to reach even better results with the ModelMaker System as soon as the new Faro Platinum Arm had been released. 

WILL BE CONTINUED

 

1. Reorganizing the point clouds

 

2. Intertwined scan stripes (ear)

 

3. Controlling the fitting of scan stripes

 

4. Inside view of left hand

 

5. Inside view of left hand

 

6. Marking the boundary of a hole

 

7. Filling a hole with Béziers surfaces

 

8. Traces of measuring noise

 

9. Traces of measuring noise

 

  

 


© Copyright 2002 for data collection and research by Hans de Roos.
© Copyright 2002 for Website design by Borbála de Roos.
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Last update of this page: 11.08.2003