Animate > Create Animated Sweep

Creates an animated sweep for the selected objects. See To use animated sweep.

Animate > Create Animated Sweep >

Time Range

Set one of the following options:

Time Slider: Creates an animated sweep for the length of time defined by the length of the time slider.
Start/End: Lets you set a specific a Start time and End Time for the animated sweep.

By Time: Evaluates the animation and create geometry for each By Time position.

Parameterization

Set one of the following options:

Uniform: Makes the profile curves run parallel to the V direction. The parameter values of the resulting surface in the U direction are equally spaced. The first profile curve corresponds to the isoparm on the surface at U[0], the second to U[1], and so on.
Chord Length: Causes the parameter values on the resulting surface in the U direction to be based on the distance between the start points of the profile curves.

Surface Degree

Sets the lofted surface to linear or cubic in the U direction.

Surface: Specifies whether an open or closed surface is created. See the Maya NURBS Modelling Guide for more information.
Output Geometry: Specifies the type of geometry created. You can choose from NURBS or Polygons.