Use an Intersect with Line node () to intersect the elements of an imported mesh with a straight line. The selected geometric entities are partitioned by the line. A selection of domains will also lead to a partitioning of adjacent boundaries. For a selection of only boundaries, an error is given if the line intersects domains adjacent to the selection as this is not supported. Use boundary selections only when there are no adjacent domains.

Enter the properties for the Intersect with Line node using the following sections:

Define the geometric entities to intersect. From the Geometric entity level list: Choose Entire geometry, Domain, or Boundary to specify the domains or boundaries to partition with the line. The option Entire geometry selects all domains and boundaries.

From the Specify list, choose Coordinates (the default) to specify the positions of a point on the line. Enter values in the corresponding x and y edit fields. Alternatively, select Vertex to select a vertex.

From the Specify list, choose Direction vector (the default) to specify the direction of the line using a vector. Enter values in the corresponding x and y edit fields. Alternatively, select Second point coordinates or Second vertex to let the line and its direction be defined by two points. For Second point coordinates, specify the coordinates in the corresponding x and y edit fields. For Second vertex, select a vertex.

Click the Active button to toggle between turning ON and OFF the vertex selection. To add a vertex to the selection, click on a vertex in the Graphics window or add one using the Selection List.

The intersection of mesh elements can result in short mesh edges, relatively small mesh elements, and elements of poor element quality. To improve the quality of the mesh, cleanup is done by snapping mesh vertices. Mesh vertices on the intersected edges can be moved (snapped) to the line to ensure a straight intersection when cleanup is performed. To decrease the amount of snapping performed, lower the Repair tolerance.

Use the Repair tolerance list to control the snapping distance by choosing Automatic (the default), Relative, or Absolute. Choose Relative to enter a value in the Relative tolerance field. This value is relative to the length of the longest side of the mesh bounding box. Select Absolute to specify a value in the Absolute tolerance field. When the operation is built with either of the settings Automatic or Relative, the values in the Relative tolerance (for Automatic only) and Absolute tolerance fields are automatically updated to be an average of the distances the mesh vertices were actually moved.