Open profiles create surfaces and closed profiles can create either a solid or a
surface. The MOde option controls is a solid of surface is created. When creating
a surface, SURFACEMODELINGMODE system variable controls if a procedural or NURBS surface
is created.

Revolve path and profile curves can be:

• Open or closed
• Planar or non-planar
• Solid and surface edges
• A single object (to extrude multiple lines, convert them to a single object with the
  JOIN command)
• A single region (to extrude multiple regions, first convert them to a single object
  with the UNION command)

To automatically delete the profile, use the DELOBJ system variable. If associativity
is on, the DELOBJ system variable is ignored and the originating geometry is not deleted.

Objects That Can Be Revolved

You cannot revolve objects contained within a block or objects that will self-intersect.
REVOLVE ignores the width of a polyline and revolves from the center of the path of
the polyline.

The right-hand rule determines the positive direction of rotation.

The following prompts are displayed.

Objects to Revolve

Specifies the objects to be revolved about an axis.

Mode

Controls whether the revolve action creates a solid or a surface. Surfaces are extended
as either NURBS surfaces or procedural surfaces, depending on the SURFACEMODELINGMODE
system variable.

Axis Start Point

Specifies the first point of the axis of revolution. The positive axis direction is
from the first to the second point.

Axis Endpoint

Sets the endpoint for the axis of revolution.

Start Angle

Specifies an offset for the revolution from the plane of the object being revolved.

Drag your cursor to specify and preview the start angle of the object.

Angle of Revolution

Specifies how far the selected object revolves about the axis.

A positive angle revolves the objects in a counterclockwise direction. A negative
angle revolves the objects in a clockwise direction. You can also drag the cursor
to specify and preview the angle of revolution.

Object

Specifies an existing object to be used as an axis. The positive axis direction is
from the closest to the farthest endpoint of this object.

You can use lines, linear polyline segments, and linear edges of solids or surfaces
as an axis.

NOTE: Select an edge subobject by pressing Ctrl while you select an edge.

X (Axis)

Sets the positive X axis of the current UCS as the positive axis direction.

Y (Axis)

Sets the positive Y axis of the current UCS as the positive axis direction.

Z (Axis)

Sets the positive Z axis of the current UCS as the positive axis direction.

Reverse

Changes the direction of the revolve; similar to entering a – (minus) angle value.
The revolved object on the right shows a spline revolved at the same angle as the
object on the left, but using the reverse option.

Expression

Enter a formula or equation to specify the revolve angle.