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CAM2

2018

FARO® Knowledge Base

Feature Extraction Using Selection Tools in CAM2

CAM2-Beauty.png

Overview

The purpose of this article is to advise how to extract features from a point cloud using the selection tools found in the Extract ribbon.

This method supports the extraction of planes, lines, circles, round slots, rectangular slots, cylinders, cones, spheres and torus.

Download a PDF of this procedure:  EX002: Feature Extraction using Selection Tools

Preparation

  • Scan the required Point Cloud ensuring ample data is capture in feature area.

Feature Extraction

There are 2 methods available to extract features from a Point Cloud:

  1. Thin Material (default). This is used when little or no data is captured on the inside ‘walls’ of the scanned feature.
  2. Standard Projection. This is used where ample data is captured on the inside ‘walls’ of the scanned feature.

Thin Material Method

This method only uses data on the face of the selected area, and ignores any data that is captured on the feature inside ‘walls’. By default, all features are calculated using the best fit solver method.

For 2D features, a plane is automatically calculated from the selected data, ignoring points on the feature edge.

  • From the Extract ribbon, select an extraction tool
    EX002Fig1.jpg
  • The Extraction mode and cursor will be activated, and indicated by an orange border.
    EX002Fig2.jpg
  • Using the selection cursor, simply left click and hold, to select the required area
    EX002Fig3.jpg
  • From the Extract ribbon, select the required feature
    EX002Fig4.jpg
  • The feature will be automatically extracted and displayed.
    EX002Fig5.jpg

Editing the Selected Data of an Extracted Feature

Once created, it is possible to view and edit the data used to create the extraction.

  • Select the feature in the Features panel
  • Right Click and select Properties
    EX002Fig6.jpg
  • The Properties window will open:
  • Select the Actual tab and the point used will be highlighted
    EX002Fig7.jpg

To add or remove data:

  • From the Extract ribbon, select an extraction tool
    EX002Fig8.jpg
  • To add points, press and hold the Shift key, a + icon will appear next to the selection tool cursor
    EX002Fig9.jpg
  • Keeping the Shift key pressed, press and hold the left mouse button to select additional points. Once the selection is made, press Modify to recalculate the feature
  • To remove points, press and hold the Ctrl key, a - icon will appear next to the selection tool cursor
    EX002Fig10.jpg
  • Keeping the Ctrl key pressed, press and hold the left mouse button to deselect points. Once the selection is made, press Modify to recalculate the feature

Standard Projection Method

This method uses data on the face and inside ‘walls’ of the feature picked. By default, all features are calculated using the best fit solver method.

For 2D features, a plane is automatically calculated from the selected data, ignoring points on the edge and inside ‘walls’ of the feature.

To activate the Standard Projection method:

  • From the Extract ribbon, select Standard Projection from the Sampling pull-down
    EX002Fig11.jpg

Features can now be selected and edited using the same steps as detailed for Thin Material