Creating Groups
Groups can be formed in various ways:
•
Upon import with the
Auto Align Scans
command
•
After import, from the Registration window:
•
Create ScanWorld Groups from Auto Alignment
•
Create ScanWorld Groups with targets
•
Create ScanWorld Groups from selection with targets
Auto Align Scans
during import:
During the import process the software checks each pairwise combination of all ScanWorlds. The
result is a delivery to a minimum spanning registration network into groups (collections).
The groups provide an initial alignment of the scans. This is not a complete automated
registration. In best case all ScanWorlds are overtaken in one common group, which means that
all stations have a cloud to cloud constraint (see also
Module 3 - Registration
and
Module 2.1-
Point Cloud import
).
This is the optimal case and depends on different conditions like:
•
geometry within the pointclouds
•
overlapping area of the ScanWorlds (min. 20%, the more the better)
•
the point amount inside the overlapping area (min. 100 000 points for good results)
•
pointcloud density (resolution)
The aforementioned conditions cannot always be achieved. ScanWorlds that cannot be aligned
to another ScanWorld will be placed in a group called
Ungroup
.
The basic Auto-Align concept with different scanned stations and the resulting pointclouds are
shown in Figure 67:
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