Selecting References for 2D Geometry
References for creating and editing 2D geometry follow:
• Curves lying on the same sketching plane.
• Visible background entities lying on the same sketch plane. The entities can be vertices, datum points, datum axes, datum csys, one-sided edges, or two-sided edges.
• Cross-sectional entities that result from the intersection of unhidden geometric entities not lying on the sketch plane with the sketch plane. The entities that intersect with the sketch plane are usually curves, datum axes, datum planes, solid surfaces, quilt surfaces, one-sided edges, or two-sided edges. Such cross-sectional entities are automatically included in the sketch and you can reference them.
• Temporary cross-sectional entities that result from the intersection of unhidden geometric entities not lying on the sketch plane with the sketch plane. To create 2D geometry, you can select such entities by holding down the ALT key and then projecting them onto the sketch plane. During projection if you are in Construction mode, construction geometry is created. Otherwise regular geometry is created.
• Model entities that are located coplanar with the current sketch plane or regardless of their orientation relative to the current sketch plane. The entities can be model vertices, model edges, datum points, datum curves, datum axes, coordinate system origins and sketch vertices belonging to other sketches.
When the sketch entity is created or modified using the snapping to model entities, references are automatically created to these snapped model entities. References are created silently directly after the creation or modification of the sketch entity.
• Model entities added to the touch buffer for horizontal, vertical, perpendicular, parallel, tangent, collinear, equal and on entity extension snapping.