# Sketcher ToggleConstruction

Sketcher ToggleConstruction |

Menu location |
---|

Sketch → Sketcher geometries → Toggle construction geometry |

Workbenches |

Sketcher |

Default shortcut |

G N |

Introduced in version |

- |

See also |

Sketcher ToggleDrivingConstraint |

## Description

This tool toggles sketch geometry from/to construction mode. It can be used on any type of geometry: line, arc or circle.

Construction geometry is an important tool of the sketcher. When using a sketch for a 3D operation, construction geometry is ignored.

In Edit sketch, construction geometry is shown as blue, and won't turn green when a sketch is fully constrained. Once you Leave sketch, construction geometry is hidden in the 3D view.

Construction lines can be used as rotation axis by the PartDesign Revolution feature.

## Usage

There are two ways of using this tool:

- Without having anything selected in the 3D view:
- Invoke construction mode by clicking on the Toggle construction geometry button or by using the
**Sketch → Sketcher geometries → Toggle construction geometry**entry in the Sketcher menu. - This will change the color for creating new geometric elements to blue.
- Newly created geometric elements will now be created in construction mode.

- Invoke construction mode by clicking on the Toggle construction geometry button or by using the
- With one or more geometric elements selected in the 3D view
- Invoke the tool by clicking on the Toggle construction geometry button or by selecting it from the menu
- The selected elements will now be changed to construction mode.
- Afterwards newly created elements will again be normal geometry.

## Example

Use Construction mode on some sketch elements,

and once you leave the sketcher editing mode, geometry that was turned into construction have become invisible in the 3D view (but are still present in the Sketcher editing mode).

## Notes

- Create point will always create points in construction mode regardless of the toolbar toggle state, select the desired points in the 3D view after creation and click Toggle construction geometry to change them to normal geometry. introduced in version 0.19

**General:**Create sketch, Edit sketch, Leave sketch, View sketch, View section, Map sketch to face, Reorient sketch, Validate sketch, Merge sketches, Mirror sketch, Stop operation

**Sketcher geometries:**Point, Line, Arc, Arc by 3 points, Circle, Circle by 3 points, Ellipse, Ellipse by 3 points, Arc of ellipse, Arc of hyperbola, Arc of parabola, B-spline, Periodic B-pline, Polyline, Rectangle, Centered rectangle, Rounded rectangle, Triangle, Square, Pentagon, Hexagon, Heptagon, Octagon, Regular polygon, Slot, Fillet, Trim, Extend, Split, External geometry, Carbon copy, Toggle construction geometry

**Sketcher constraints:****Geometric constraints:**Coincident, Point on object, Vertical, Horizontal, Parallel, Perpendicular, Tangent, Equal, Symmetric, Block**Dimensional constraints:**Lock, Horizontal distance, Vertical distance, Distance, Radius, Diameter, Radiam, Angle, Snell's law, Internal alignment**Constraint tools:**Toggle driving/reference constraint, Activate/deactivate constraint

**Sketcher tools:**Select unconstrained DoF, Close shape, Connect edges, Select associated constraints, Select associated geometry, Select redundant constraints, Select conflicting constraints, Show/hide internal geometry, Select origin, Select vertical axis, Select horizontal axis, Symmetry, Clone, Copy, Move, Rectangular array, Remove axes alignment, Delete all geometry, Delete all constraints

**Sketcher B-spline tools:**Show/hide B-spline degree, Show/hide B-spline control polygon, Show/hide B-spline curvature comb, Show/hide B-spline knot multiplicity, Show/hide B-spline control point weight, Convert geometry to B-spline, Increase B-spline degree, Decrease B-spline degree, Increase knot multiplicity, Decrease knot multiplicity, Insert knot

**Sketcher virtual space:**Switch virtual space

**Additional:**Sketcher Dialog, Preferences, Sketcher scripting

**Getting started****Installation:**Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap**Basics:**About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate

**Help:**Tutorials, Video tutorials**Workbenches:**Std Base, Arch, Draft, FEM, Image, Inspection, Mesh, OpenSCAD, Part, PartDesign, Path, Points, Raytracing, Reverse Engineering, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web**Deprecated or unmaintained workbenches:**Complete, Drawing, Robot

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