`ifcopenshell.util.placement`¶

Module Contents¶

ifcopenshell.util.placement.a2p(o: Iterable[float], z: Iterable[float], x: Iterable[float]) → MatrixType¶

Converts a location, X, and Z axis vector to a 4x4 transformation matrix

IFC uses a right-handed coordinate system, so it is not necessary to provide the Y axis.

Parameters:

o (iterable[float]) – The origin (i.e. location) of the matrix
z (iterable[float]) – The +Z vector / axis of the matrix
x (iterable[float]) – The +X vector / axis of the matrix

Returns:

A 4x4 numpy matrix

Return type:

MatrixType

ifcopenshell.util.placement.get_axis2placement(placement: ifcopenshell.entity_instance) → MatrixType¶

Parses an IfcAxis2Placement (2D or 3D) to a 4x4 transformation matrix

Note that this function only parses a single placement axis. If you want to get the placement of an element instead, element placements often are made out of multiple placement axes or other alternative placement methods. You should use get_local_placement instead.

Parameters:: placement (ifcopenshell.entity_instance) – The IfcLocalPlacement enitity
Returns:: A 4x4 numpy matrix
Return type:: MatrixType

ifcopenshell.util.placement.get_cartesiantransformationoperator3d(inst: ifcopenshell.entity_instance) → MatrixType¶

Parses an IfcCartesianTransformationOperator into a 4x4 transformation matrix

Note that in general you will not need to call this directly. See get_mappeditem_transformation instead.

Parameters:: item (ifcopenshell.entity_instance) – The IfcCartesianTransformationOperator entity
Returns:: A 4x4 numpy transformation matrix
Return type:: MatrixType

ifcopenshell.util.placement.get_local_placement(placement: ifcopenshell.entity_instance) → MatrixType¶

Parse a local placement into a 4x4 transformation matrix

This is typically used to find the location and rotation of an element. The transformation matrix takes the form of:

[ [ x_x, y_x, z_x, x   ]
  [ x_y, y_y, z_y, y   ]
  [ x_z, y_z, z_z, z   ]
  [ 0.0, 0.0, 0.0, 1.0 ] ]

Example:

placement = file.by_type("IfcBeam")[0].ObjectPlacement
matrix = ifcopenshell.util.placement.get_local_placement(placement)

Parameters:: placement (ifcopenshell.entity_instance) – The IfcLocalPlacement entity
Returns:: A 4x4 numpy matrix
Return type:: MatrixType

ifcopenshell.util.placement.get_mappeditem_transformation(item: ifcopenshell.entity_instance) → MatrixType¶

Parse an IfcMappedItem into a 4x4 transformation matrix

Mapped items take a representation with an origin and transform them with a cartesian transformation operation. This function returns the final transformation matrix.

Parameters:: item (ifcopenshell.entity_instance) – The IfcMappedItem entity
Returns:: A 4x4 numpy transformation matrix
Return type:: MatrixType

ifcopenshell.util.placement.get_storey_elevation(storey: ifcopenshell.entity_instance) → float¶

Get the Z elevation in project units of a buildling storey

Building storeys store elevation in two possible locations: the Z value of its placement, or as a fallback the Elevation attribute.

Parameters:: storey (ifcopenshell.entity_instance) – The IfcBuildingStorey entity
Returns:: The elevation in project units
Return type:: float

ifcopenshell.util.placement.rotation(angle: float, axis: Literal[X, Y, Z], is_degrees=True) → MatrixType¶

Create a 4x4 numpy matrix representing an euler rotation