Perimeters appear graphically much like a series of connected lines that define a 3D volume. Perimeters are used with scanning devices to define a region of interest for measurement purposes.
This command will create an open or closed perimeter object from selected points. Its purpose is to provided a boundary for scanning instruments. The below example shows perimeters to capture data from a targetless scanner.
This option will build a bounding perimeter for each and every surface face selected. This makes it quite easy to identify specific CAD faces to be measured.
When a scan of an entire model is needed, this option delivers. It uses the base frame of the selected instrument as the viewpoint, allows a selection of a selection of surfaces and builds a bounding perimeters that is grown 10% larger than the model to ensure complete surface coverage from the instruments perspective.
This option first builds a b-spline from the intersection of a plane and a surface. It then analyzes the curve to identify how much of it is visible from the selection instrument station.
It then builds an open perimeter based upon what is visible from the instrument's current position:
This tool allows a user to take advantage of a set of planes laid out at an even spacing (see the Multi-Geometry Building Tool) and build a set of cross section perimeters for measurement.
Note that if the cross section has holes or gaps that result from holes or transitions in the CAD model, these will need to be bridged. These will be detected and a prompt will be shown as to how large a gap to bridge. Enter large value to bridge all the holes in the part and build a perimeter from one edge to another: