求GRIP语言开发中偏置面是哪个函数

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ug插入Offset Face是哪个函数？
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Create Offset BodySynopsis

obj = OFFSRF/obj,distance[,TOLER,edge curve tolerance]

Description

Creates an offset body from a previously defined base face at a specified distance. When creating the offset body, the system also generates edge curves. You may specify an edge curve tolerance to control how accurately the edge curves lie on the body.

Parameters

Parameter	Description
obj	The existing base face from which the offset body is offset.
distance	The distance from the base face along the face normals, at which the new offset body is created. The distance may be positive or negative but not zero.
TOLER	Minor word indicating that a tolerance is to be specified. If none is specified, the default is the value set in the NX option Preferences->Modeling. You can also read and set this tolerance using the GPA &DISTOL.
edge curve tolerance	Controls how accurately the edge curve lies on the body. The smaller the tolerance value, the better the edge curve lies on the body.

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