Place Object

Overview

Provides guidance on how objects are placed using local placement.
Objects may be placed relative to other objects (i.e. within the local coordinate system of another object). This is achieved by asserting the 'PlacementRelTo' attribute of the local placement object.
Where the object is not specifically placed relative to another object, it is considered as being placed absolutely within the world coordinate system.

Results

Object placement is defined.

Description	Entity/Pset/Functional Part	MAN	REC	OPT
The object to be placed will be a subtype of IfcProduct. In this functional part, it is assumed that the owner history of the product is applied. It is further assumed that product naming and determination of the object type has been established.	IfcProduct Including all local and inherited attributes fp_apply_owner_history
Assert that the object is to be placed	IfcProduct.ObjectPlacement::IfcLocalPlacement
Where an object is placed relative to another object, the relative placement attribute is asserted. This attribute is not asserted where the object is to be placed within the world coordinate system.	IfcLocalPlacement.PlacementRelTo
Place the object. Placement is either 2 dimensional or 3 dimensional. The appropriate parameter should be used in conjunction with the functional part name.	fp_place (2D) fp_place (3D)

IFC Entities Required

IfcLocalPlacement
IfcObject
IfcObjectPlacement
IfcProduct
IfcRoot

IFC Datatypes Required

IfcGloballyUniqueId
IfcLabel
IfcText

IFC Functions Required

-

IDM Functional Parts Required

fp_apply_owner_history
fp_place

EXPRESS Schema

SCHEMA FP_PLACE_OBJECT;

  TYPE IfcGloballyUniqueId = STRING (22) FIXED;
  END_TYPE;

  TYPE IfcLabel = STRING;
  END_TYPE;

  TYPE IfcText = STRING;
  END_TYPE;

  ENTITY IfcProduct
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcObject);
      ObjectPlacement : OPTIONAL IfcObjectPlacement;
    WHERE
      WR1 : (EXISTS(Representation) AND EXISTS(ObjectPlacement))
            OR (EXISTS(Representation) AND 
            (NOT('IFC2X2_FINAL.IFCPRODUCTDEFINITIONSHAPE' IN TYPEOF(Representation))))
            OR (NOT(EXISTS(Representation)));
  END_ENTITY;

  ENTITY IfcObject
    ABSTRACT SUPERTYPE
    SUBTYPE OF(IfcRoot);
      ObjectType : OPTIONAL IfcLabel;
    WHERE
      WR1 : SIZEOF(QUERY(temp <* IsDefinedBy | 'IFC2X2_FINAL.IFCRELDEFINESBYTYPE' IN TYPEOF(temp))) <= 1;
  END_ENTITY;

  ENTITY IfcRoot
    ABSTRACT SUPERTYPE;
      GlobalId     : IfcGloballyUniqueId;
      Name         : OPTIONAL IfcLabel;
      Description  : OPTIONAL IfcText;
      OwnerHistory : fp_appy_owner_history;
    UNIQUE
      UR1 : GlobalId;
  END_ENTITY;

  ENTITY fp_appy_owner_history;
  END_ENTITY;

  ENTITY IfcObjectPlacement
    ABSTRACT SUPERTYPE;
    INVERSE
      ReferencedByPlacements : SET OF IfcLocalPlacement FOR PlacementRelTo;
  END_ENTITY;

  ENTITY IfcLocalPlacement
    SUBTYPE OF(IfcObjectPlacement);
      PlacementRelTo    : OPTIONAL IfcObjectPlacement;
      RelativePlacement : fp_place;
    WHERE
      WR21 : IfcCorrectLocalPlacement(RelativePlacement, PlacementRelTo);
  END_ENTITY;

  ENTITY fp_place;
	(* --- referenced either fp_place (2D) or fp_place (3D) --- *)
  END_ENTITY;

END_SCHEMA;

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