圆弧，边界平面

Synopsis

obj = CYLNDR/arc,plane,point

Description

Creates a cylinder by specifying an existing arc and plane. The plane of the arc and the specified plane bound the sheet display.

The point specified is used to decide which side of the cylinder to keep, if and only if the the bounding planes

Parameters

Parameter

Description

arc

An existing arc which serves as the generating curve, the directrix, and also as one of the bounding planes. By definition, the axis of the cylinder, the generatrix, is normal to the plane of the arc.

plane

An existing plane which serves as the other bounding plane.

point

A previously defined point which may be needed to determine which portion of the cylinder is created. Although the point is required in this cylinder definition, it is only significant when the existing plane and the plane of the arc are not parallel and the plane passes through the arc. This condition causes a partial cylinder to exist on either side of the arc. The point serves to eliminate one of the possibilities.

Parameter	Description
arc	An existing arc which serves as the generating curve, the directrix, and also as one of the bounding planes. By definition, the axis of the cylinder, the generatrix, is normal to the plane of the arc.
plane	An existing plane which serves as the other bounding plane.
point	A previously defined point which may be needed to determine which portion of the cylinder is created. Although the point is required in this cylinder definition, it is only significant when the existing plane and the plane of the arc are not parallel and the plane passes through the arc. This condition causes a partial cylinder to exist on either side of the arc. The point serves to eliminate one of the possibilities.