Snap to lines, edges, and extension lines
You can snap to lines when you model objects that should be lined up with an existing object or with a grid line. You can also snap to the extension lines of part reference lines, or to the extension lines of nearby objects' reference lines.
Snap to a line or an edge
Use the Snap to line snap switch when you need to snap to another line in the model. You can snap to grid lines, reference lines, and the edges of existing objects.
Use the Snap to line snap switch when you need to create, for example, several beams one after another on a grid line. With the Snap to line snap switch you do not need separately pick the start point and the end point of the beam.
If you use the Snap to line snap switch with a command that requires only one point to be picked, for example when creating a column, only the start point of the line is used to position the part.
Snap to extension lines
Use the Snap to extension lines snap switch when you need to snap to the extensions of the part reference lines, which are the lines between part handles, or to the extensions of nearby objects' reference lines. The extension line is shown as a blue, dashed line. You can use extension lines as an aid when you want to align objects with one another, or for creating objects parallel to an existing object.
The Snap to extension lines snap switch works with beams, polybeams, plates, and slabs.
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With beams, the extension line is the line that passes through both of the part handles.
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With polybeams, plates, and slabs, the extension lines are the lines that pass through to the consecutive part handles.
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With beams and polybeams, you can snap to the line that passes through the handle at the end of the beam, and which is perpendicular to the direction of the beam.
The Snap to reference lines and points and Snap to geometry lines and points snap switches do not affect the Snap to extension lines snap switch.
Tips on how use extension lines as a snapping aid
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When you snap to the extension lines of nearby objects, the extension line snaps to the direction of the nearby object and the extension line indicates the direction that is followed in snapping. Snapping to the extension lines of nearby objects can be useful, for example, when you want to align objects with one another.
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If you need to create objects parallel to existing objects, for example parallel beams, use the extension line of a nearby object as a snapping aid.
For example, start the Create steel beam command, and pick the start point. Move the mouse on top of the object whose extension line you are using to create the new parallel beam. Click on the extension line to indicate the end point of the new parallel part.