Creates a 3D solid from an object that encloses an area, or a 3D surface from an object with open ends. 

Objects can be extruded orthogonally from the plane of the source object, in a specified direction, or along a selected path. You can also specify a taper angle. 

The DELOBJ system variable controls whether the source objects or selected path are automatically deleted when the solid or surface is created, or whether you are prompted. 

Objects to Extrude

Specifies the objects to extrude. 

Select face and edge subobjects by pressing Ctrl while you select them. 

Mode

Controls whether the extruded object is a solid or a surface. 

Surfaces are extruded as either NURBS surfaces or procedural surfaces, depending on the SURFACEMODELINGMODE system variable. 

Height of Extrusion

Extrudes selected objects along the positive or negative Z axis. The direction is based on the UCS that was current when the object was created, or (for multiple selections) on the original UCS of the most recently created object. 

Direction

Specifies the length and direction of the extrusion with two specified points. (The direction cannot be parallel to the plane of the sweep curve created by the extrusion.)

Path

Specifies the extrusion path based on a selected object. The path is moved to the centroid of the profile. Then the profile of the selected object is extruded along the chosen path to create solids or surfaces. 

Select face and edge subobjects by pressing Ctrl while you select them. 

The path should not lie on the same plane as the object, nor should the path have areas of high curvature. 

The extrusion starts from the plane of the object and maintains its orientation relative to the path. 

If the path contains segments that are not tangent, the program extrudes the object along each segment and then miters the joint along the plane bisecting the angle formed by the segments. If the path is closed, the object should lie on the miter plane. This allows the start and end sections of the solid to match up. If the object is not on the miter plane, the object is rotated until it is on the miter plane. 

Objects with multiple loops are extruded so that all of the loops appear on the same plane at the end section of the extruded solid. 

Taper Angle

Specifies the taper angle for the extrusion. 

Positive angles taper in from the base object. Negative angles taper out. The default angle, 0, extrudes a 2D object perpendicular to its 2D plane. All selected objects and loops are tapered to the same value. 

Specifying a large taper angle or a long extrusion height can cause the object or portions of the object to taper to a point before reaching the extrusion height. 

Individual loops of a region are always extruded to the same height. 

When an arc is part of a tapered extrusion, the angle of the arc remains constant, and the radius of the arc changes. 

1. Angle of Taper - Specifies the taper between -90 and 90+ degrees. 
   
2. Specify Two Points - Specifies the taper angle based on two specified points. The taper angle is the distance between the two specified points. 
   

Drag the cursor horizontally to specify and preview the taper angle. You can also drag the cursor to adjust and preview the height of the extrusion. The dynamic input origin should be placed on the extruded shape, on the projection of the point to the shape. 

When you select the extruded object, the position of the taper grip is the correspondent point of the dynamic input origin on the top face of the extrusion. 

Expression

Enter a formula or equation to specify the extrusion height. 

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