Full text: New perspectives to save cultural heritage

CIPA 2003 XIX"' International Symposium, 30 September - 04 October, 2003, Antalya, Turkey 
Fig. 3: Processing steps in Geomagic Raindrop Software. 
UL: Result of first meshing. 
UR: After checking for manifold meshes and cleaning. 
LL: Positions of holes. LR: Final result. 
Approx. Scale 1:4 
that in the end caused the adjacent hole. These holes remain 
after the automatic filling. In these cases, the last row of 
triangles around the holes is removed and the automatic filling 
procedure, when applied again, will be successful for further 
holes. If the object structure is very complex, which is not 
unusual in the neighborhood of holes, the hole filling has to be 
accomplished in an interactive manual process which is very 
time-consuming. The hole filling treatment for one single relief 
may require up to four working days! 
When all holes are removed from the six separate parts, a 
complete model of the relief is merged again. As mentioned 
above, this ‘Merge Polygon Objects’ process can handle only 
about 4 million points. This is the reason why a very high 
resolution model cannot be produced for one whole relief. If 
any holes are left that extend from one previously separated part 
to an other one, this area, including the complete hole, has to be 
selected now, the holes have to be filled and the separated area 
has to be merged again with the rest of the model. 
All points and triangles created in the hole filling process are 
also stored in a separate file, since they can be used again when 
the very high resolution model is created (see section 4.2). 
4.2 Very high resolution model (5 to 6 models per relief) 
A point distance of 0.1 mm is aimed at for the very high resolu 
tion model. All scanned points as merged for the fine model 
(see 4.1, merging) plus all points resulting from the hole filling 
process as described in section 4.1 are introduced. Then the 
points are thinned to a uniform 0.1 mm point width. In order to 
make data handling possible, the relief is now divided into 5 to 
6 sub-models which should contain not more than 3 million 
points each. 
The following procedures are much the same as described 
above for the fine model: The points are meshed and cleaned. 
Manifold checks are applied after every procedure that results in 
data changes. New holes appearing in the model because of the 
more sensible meshing parameters must be filled. This has to be 
done in subsets which have to be merged again afterwards. 
4.3 Coarse resolution model (one model for the cenothaph) 
Fig. 4: Coarse resolution model (shaded view of point cloud)
	        
Waiting...

Note to user

Dear user,

In response to current developments in the web technology used by the Goobi viewer, the software no longer supports your browser.

Please use one of the following browsers to display this page correctly.

Thank you.