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OneSpace Designer: ME10 Dynamic Drafting MI Interfacing


Faces Section (#~81)

The Faces section of the MI file is reserved for entities that describe operations performed on surfaces. In the current revision, the Planar Face entity is the only one in this category.

PFA (Planar Face)

A Planar Face entity defines an area that is available for area-dependent operations such as hatching.

The face is defined in terms of a closed outer contour, and any number of closed inner contours. The outer contour is mandatory, and inner contours are optional.

The contours are set up using Composite Curve entities (COC) defined in the Composite Geometry section, or with Text Block entities (TEX) defined in the Composite Annotation section.

The outer contour is formed from closed geometry, such as a circle or a closed set of lines. The geometry is grouped under a COC entity.

Inner contours can be thought of as holes within the face, and may be formed from closed geometry or text. Inner contours can be formed using composite curve entities, dimension entities, or text entities.

Pointer Tree


Figure 84. Pointer Tree for PFA

Identification Data

PFA Entity Type
n+ Entity Sequence Number

Attribute Data

No Attribute Data.

All the required attributes are defined in the contours.

Property Data

n+ Property Count

PTR First Property Pointer. For example, this could be a pointer to an Associated Text Property entity (ASSP), relating to the face.
: 

PTR Last Property Pointer

Parameter Data

PTR Pointer to Hatch entity (HAT), in Annotation Elements section, where the hatch parameters are specified.

  If a Hatch entity is not required, the value of this pointer will be zero.

PTR Pointer to Outer Contour. This will be a Composite Curve (COC) in the Composite Geometry section.

n+ Number of Inner Contours

PTR Pointer to First Inner Contour. This will be a Composite Curve (COC) in the Composite Geometry section, or a Text Block (TEX) or a Dimension in the Composite Annotation section.
... 

PTR Pointer to Last Inner Contour. This is a Composite Curve or Text Block as described above.

|~ End of Entity


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