俺还真没有认真研究过...
作为理想的平面和曲面相交求交线两种plan都可以吧...作者: rewop 时间: 2002-11-25 05:41
Datum Plane - Overview
Use the Datum Plane option to create reference planes that serve as aids when existing planes are not available. Datum planes can assist you in creating features on cylinders, cones, spheres, revolved solid bodies, and other objects. Datum planes can also help you in creating features at angles other than normal to the faces of the target solid.
You can create either relative or fixed datum planes.
Relative Datum Planes
When you create a relative datum, you create it "relative" to other objects in the model. You can select curves, faces, edges, points, and other datums for the reference objects. By default, the constraint type is inferred based on the objects you select, and the sequence in which you select them. You can also specify a constraint explicitly, and then select the object to be associated with it.
Relative datum planes can be applied across multiple bodies.
Plane
Allows you to create an unbounded plane object using the Plane Constructor. The plane you create is represented by a 3-4-5 triangle symbol situated with the right angle vertex on the origin point of the plane. The short leg is oriented along the implied X axis and the long leg along the implied Y axis. Each of the legs has a gap at the midpoint.
The plane symbol represents a flat surface extending infinitely through space. It can be used to cross-section curves and surfaces, and to define limits of surfaces.
The scale of the symbol is fixed and the display of the plane object is permanent. It can be deleted, blanked and unblanked, and transformed just like any other object. The symbol itself, however, may not be edited.
The Plane option provides the following ways to create a plane:作者: zwl 时间: 2002-11-25 08:47
DATUMN PLANE的建立基于参数，PLANE没有参数作者: weichaoting 时间: 2002-11-25 08:59