Real-Time Meshing Controls
Real-Time Meshing
A real-time mesh can be enabled during scanning. This can be quite useful as an easy to see coverage indicator and provides a surface like rendering of the data.
In order to enable the Real-Time Mesh go to the User Options and on the Display tab select Clouds & Mesh (Figure 26-13). Within this default control is an option to enabled the Mesh Display.
The mesh is displayed in two colors.
-
Green. Indicates good mesh quality
-
Yellow. Indicates the scan was at a sharp angle relative to the mesh grid. The mesh is colored yellow when the scan to surface angle is great than 2/3 the Grid Max Angle.
Defaults can be set using the predefined Fast or Standard options. Or your settings can be customized with the following controls:
-
Smallest Hole Diameter. Defines the expected hole size in the mesh. Setting too large a value with could cause holes to be filled. This field can be used as a mater control for the following three settings (Stripe Max Deviation, Stripe Max Point Spacing and Grid Size).
-
Stripe Max Deviation. The maximum strip distance to be connected when building a mesh.
-
Stripe Max Point Spacing. The maximum distance within a scan line to bridge within the mesh.
-
Grid Size. Defines the average triangle edge length to use in the meshing process.
-
Grid Max Angle. This setting works as a rejection threshold beyond which data with too steep a probing vector will be either rejected or marked as suspect.
-
Grid Max Ratio. Maximum ratio of the triangle area with respect to an equilateral triangle. Basically how long and thin a triangle can get without being broken into smaller triangles.
-
Mesh Refresh. The mesh refresh rate controls the rate at which new mesh segments are added to the graphics during measurement.
-
Drift Detection. The drift detection threshold controls notification of possible drift during scanning. Expected values are between 0 (no notification) and 10 or 10 times the size of the mesh grid.
At any time you can also right-click on a scan stripe cloud and generate a finalized
Real-Time Scanning Drift Check
When enable, the Real-Time mesh also offers a live scanning drift check notification. This offers the ability to Jump Instrument to New Location if the newest measured mesh segment differs in alignment from the rest of the mesh by a given mount. This Drift Detection threshold is set within the Real-time mesh settings.
-
Yes. Pressing Yes will jump the instrument to a new location, split the last scan pass from the original cloud and build a new one associated with the new instrument ready to be re-aligned.
-
No. Pressing No offers an option to ignore the warning and continue scanning.
If you press No its quite possible that there is a misalignment between different scan passes. SA also offers an option to align scan passes within a cloud which may improve data integrity in a case like this.
Note -- If you want to disable this notification process for any reason you can do so by entering “0” for the Drift Detection [ ... ](Grid Size) value.