Create by Linear Offset

Create a line or a point from a vertex computed by orthogonally projecting a vertex onto a line, alignment or reference line.

Home / Tools / Create / Point / Linear Offset
Home / Tools / Create / Line / Straight / Linear Offset

Solve module

The following controls are available:

Control	Description
Name	Type the name to be assigned to the created object or click to use the next available auto incremented name.
Linear Object	Select if you want to project the vertex onto an existing object or a reference line. Object - Input the line or alignment to orthogonally project the vertex to. Reference Line - Input the reference line to orthogonally project the vertex to.
From	Input the vertex to orthogonally project onto the line. Note: When creating a line segment, this vertex is the start vertex.
3D offset computation	Do one of the following: Select the checkbox to orthogonally project the vertex in 3 dimensions. Clear the checkbox to orthogonally project the vertex in 2 dimensions.
Project start/end segments	Do one of the following: Select the checkbox to consider offsets to a projected line or alignment. Clear the checkbox to only consider direct offsets to the line or alignment. Note: Reference lines will always be projected. Transition curves and circular curves can not be projected.

• Use the linear offset tool to create points or single segment lines.
• Click OK to:
  • create a point at the computed vertex.
  • create a line segment between the From vertex and the computed vertex, and then end the line.
• When computing in 2 dimensions, if all the vertices in the line segment have heights a height will be interpolated for the computed vertex.
• When computing in 3 dimensions, the vertex will only be created if the From vertex, and all vertices in the selected object have heights.
• If the geometry of the line or alignment allows multiple solutions then the vertex with the smallest offset is created.
• When the line or alignment segment is a circular curve or transition curve, or 'Reference Line' is selected as the linear object you can compute offsets in 2 dimensions only.
• Use the Modify Insert tool to insert the created vertex into the Object.
• If a line is already under construction, you should end the line prior to creating the line by linear offset.

In the diagram below:

• The red point is the vertices original location.
• The green point is the new vertices location.
• The green dashed line is perpendicular to the blue line in 2 dimensions.

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