EXTRUDE command

Creates 3D solids or surfaces by extruding entities.

BricsCAD Shape; BricsCAD Pro; BricsCAD Mechanical; BricsCAD BIM


Alias: EXT


Creates 3D solids or surfaces by extruding open or closed 2D entities, faces of 3D solids, regions or closed boundaries.

  • The SELECTIONPREVIEW system variable must be set to 2 or 3 to highlight faces.
  • Depending on the value of the DELOBJ system variable, the source entities are either retained or deleted. If not, you are prompted whether you want the entities deleted or not.


There are two methods to extrude entities:

  • Create 3D solids.
  • Create surfaces.

Options within the command

Allows you to create either solids or surfaces.
Creates 3D solids.
Creates surfaces.
Note: EXTRUDE does not extrude open 2D entities as 3D solids because they cannot be watertight.
Specify height of extrusion
Allows you to set a height of extrusion. The extrusion height is measured perpendicularly to the source entity.
Note: You can specify the height dynamically, using the Manipulator, or typing a distance value.
Allows you to specify the extrusion direction.
Specify the extrusion height and taper by another entity. The program uses the path to determine how to extrude the source entity.
Note: The path entity cannot lie in the same plane as the extrusion entity.
Taper angle
Specifies the taper angle for the extrusion. The angle is measured from the extrusion direction. A negative value tapers outwards.
Note: The angle must be shallow enough so that the sloping sides do not intersect after the top of the extrusion.
The result depends on the extrusion direction and the value of the four Extrude mode system variables: EXTRUDEOUTSIDE, EXTRUDEINSIDE, INTERSECTEDENTITIES and UNITESURFACES.
Note: The default value of all above Extrude mode system variables depends on the Workspace:
  • 0 for Draft and Modeling.
  • 1 for Mechanical and BIM.
For example, in the Mechanical an BIM workspaces if all Extrude Mode system variables have the default value, the extrude result is like below:
  • When you highlight an entity and extrude it to the outward, a new volume is added.
  • When you highlight an entity and extrude it to the inward, a volume is subtracted from the main solid.
The 3D solid is subtracted from each interfering existing solid.
A new volume or surface is created, regardless of the extrusion direction.
The new 3D solid is unified with each interfering existing solid.
Cuts through solids with the extruded surface.
  • Select an entity to be extruded.
  • The extruded surface cuts through solids.
Both sides
Extrudes symmetrically in both sides.
Allows you to select or to define an axis.
Define the extrusion direction by specifying two points.
Allows you to select an axial entity.
Uses the previous axis.
Allows you to specify a point on view direction.
Sets the extrusion direction parallel to the X axis of the current UCS.
Sets the extrusion direction parallel to the Y axis of the current UCS.
Sets the extrusion direction parallel to the Z axis of the current UCS.
set Limit
Allows to limit the extrusion by the face of a solid.
  • Select an entity to be extruded.

  • Select a face as limit of the extrusion.
Note: If the HOTKEYASSISTANT system variable is ON, the Hotkey Assistant widget displays. Repeatedly press the Ctrl key during the dynamic display of the extrusion to cycle the various options