Line Snap
While you create a line in a 3D sketch, you can snap the line to geometry that already exists in the part, such as model surfaces or vertices, and sketch points.
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Snap is not enabled if you are sketching in one of the major coordinate directions.
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If you are sketching on a plane, and the SolidWorks software infers a snap to a non-planar point, a temporary 3D graphics box is displayed to indicate an off-planar snap.