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space. The three points also define the plane of the circumference. Use
this option to rotate the mesh torus as you create it.
 Set the circumference or radius. Use the 2P (Two Points) option to
define the size of the mesh torus anywhere in 3D space. The plane of the
circumference matches the Z value of the first point.
 Set the location to be tangent to two objects. Use the Ttr (Tangent,
Tangent, Radius) option to define points on two objects. Depending on
the specified radius distance, the path of the torus is located as near as
possible to the tangent points you specify. You can set up tangency with
circles, arcs, lines, and some 3D objects. The tangency points are projected
onto the current UCS. The appearance of tangency is affected by the current
level of smoothness.
Construct Meshes from Other Objects
Create mesh forms by filling the space between other objects such as lines
and arcs.
You can use a variety of methods to create mesh objects whose edges are
defined by other objects. The MESHTYPE system variable controls whether
the new objects are valid mesh objects, or whether they are created using
legacy polyface or polygon geometry.
You can control whether the mesh is displayed as a wireframe, hidden, or
conceptual image by changing the visual style (-VISUALSTYLES).
Types of Meshes Created from Other Objects
You can create several types of meshes that are based on existing objects.
 Ruled mesh.RULESURF creates a mesh that represents the ruled surface
between two lines or curves.
422 | Chapter 8 Work with 3D Models