Skeleton
Polygon Straight Skeleton
Use this option to create straight skeletons of simple and nested closed polygons.
On the Design menu, point to Polygon Edit, then click Skeleton to display the following panel.
Skeleton Options
Note: After your object(s) have been selected, you can toggle through the different skeleton options to preview the results without having to reselect the object(s) each time.
Complete skeleton
Creates the complete skeleton structure.
Skeleton spine
Creates just the spine of the skeleton.
Keep longer branches
Creates the skeleton structures that are equal to or greater than the minimum branch length.
Minimum branch length
Enter a minimum branch length. Any skeleton branch less than this length will not be created.
Use Projection Plane
Select this option to expand the panel with additional options to define a projection plane.
Plane method
Select from the drop-down list to define a plane with the selected method. See below for explanations of the available plane methods.
Level
A flat plane at the given elevation.
Elevation
The elevation can be defined two ways:
-
Type the elevation into the textbox.
-
Click the Define button and then digitise the elevation on the screen.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Easting
A vertical plane at the given easting.
Easting
The easting can be defined two ways:
-
Type the easting into the textbox.
-
Click the Define button and then digitise the easting on the screen.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Northing
A vertical plane at the given northing.
Northing
The northing can be defined two ways:
-
Type the northing into the textbox.
-
Click the Define button and then digitise the northing on the screen.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Line Segment
A plane defined along a selected line segment at the given angle (dip).
Dip
Enter the dip angle.
Define
Click this button to select a line segment of an existing object.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Two Points
Similar to the Line Segment option, except the segment is defined by interactively defining two points.
Dip
Enter the dip angle.
Define
Click this button to digitise the two points.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Three Points
A plane defined by interactively defining three points.
Define
Click this button to digitise the plane, defined by three points.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Strike and Dip
A plane defined by the strike and dip.
Strike
Enter the strike angle.
Dip
Enter the dip angle.
X, Y, Z
These fields show the coordinates of the origin of the plane. The origin can be defined by clicking the Define button and digitising it on screen or by entering the coordinates directly into the textboxes.
Define
Click this button to digitise the origin of the plane.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Best Fit
A plane determined to be the best fit, in a least squares sense, to a selected point cloud.
Define
Click this button to select the point cloud.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Interactive
A plane defined interactively within Vulcan.
Bearing / Plunge
Enter the bearing and plunge angles, or click the Interactive button to select the bearing and plunge interactively.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Current View
The current view in Vulcan.
Interactive
The interactive button can be used to display the current plane definition or change it by dragging the handles around.
Explicit
A plane defined by the equation of the plane.
The equation of the plane is ax + by + cz + d = 0.
a, b, c, d
Click the Interactive button to digitise the bearing and plunge, or enter the values for the equation directly into the textboxes.
Interactive
The Interactive button can be used to display the current plane definition or change it by dragging the handles around.
Output
Layer name
Select a layer in which to store the results from the drop-down list. You may create a new layer by entering a new layer name in the space provided.
Description (Optional)
Enter a description of the layer.
