Interval Settings Dialog Box

Use this dialog box to specify how incremental vertices are added along the 3D polylines or feature lines when generating rail lines.

Horizontal Alignment

Specifies how incremental vertices are added along the rail lines in relation to the parent rail alignment.

Along Tangents

Specifies the insertion frequency for vertices along the tangent portions of a rail line. Enter a value or click and select a distance in the drawing.

Along Curves

Specifies how the frequency for inserting vertices along curves is determined.

• By Curvature: Horizontal baseline curves are tessellated using the Mid-Ordinate Distance To Define Curvature value. Stations are created along the tessellated curve at each point where the tessellation touches the curve, as shown in the following illustration:
  
• At An Increment: Stations are placed along the curve at the value specified in the Curve Increment field.
• Both: Uses both the By Curvature option and the At An Increment option.

Curve Increment

Specifies the insertion frequency for vertices along curves. The Along Curves setting must be set as At Increment or Both to change this setting. Enter a value or click and select a distance in the drawing.

Mid-Ordinate Distance to Define Curvature

Specifies the mid-ordinate distance for the rail line segments along curves. Enter a value or click and select a distance in the drawing.

Along Spirals

Specifies the insertion frequency along the spiral portion of an alignment. Like curves, spirals are tessellated and stations are created along the tessellated curve at each point where the tessellation touches the spiral. Enter a value or click and select a distance in the drawing.

Note: This setting is not used when a feature line is specified for the horizontal baseline.

At Horizontal Geometry Points

Specifies whether the vertices should be inserted at horizontal baseline geometry points where the horizontal baseline geometry changes (such as the start of a curve).

At Cant Critical Points

Specifies vertices on the rail line that correspond to the cant critical points on the parent alignment.

At Mid of Curve

Specifies vertices on the rail line that correspond to the mid-curve points on the parent alignment.

At Sample Line Stations

Creates vertices on the rail line that correspond to existing sample lines along the parent alignment. Click in the Value field and specify the sample line group to use.

Vertical Alignment

Specifies how incremental vertices are added along the rail lines in relation to the profile of the parent rail alignment.

Along Vertical Curves

Specifies the insertion frequency of vertices along curve portions of the profile geometry. Enter a value or click and select a distance in the drawing.

At Vertical Geometry Points

Specifies whether the vertices should be inserted at vertical baseline geometry points where the vertical baseline geometry changes.

At High/Low Points

Specifies whether the vertices should be inserted at the high and low points of the vertical baseline geometry.

Options for Adding and Deleting Stations

Creates vertices on the rail line that correspond to manually specified stations along the parent alignment. The list of stations is listed at the bottom of the dialog box. Click to add a station. To delete stations, select them from the list and click .