IfcVoxelGrid

Item	SPF	XML	Change	Description
IFC4X3_ADD2 to IFC4X4_draft
IfcVoxelGrid			ADDED

Semantic definitions at the entity

Entity definition

An IfcVoxelGrid representation is a 3D solid shape representation that is compiled of a series of regular blocks placed inside a predefined grid.

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	VoxelSizeX	IfcNonNegativeLengthMeasure		Size of voxels in the X axis.	X
2	VoxelSizeY	IfcNonNegativeLengthMeasure		Size of voxels in the Y axis.	X
3	VoxelSizeZ	IfcNonNegativeLengthMeasure		Size of voxels in the Z axis.	X
4	NumberOfVoxelsX	IfcPositiveInteger		Number of voxels along the X axis.	X
5	NumberOfVoxelsY	IfcPositiveInteger		Number of voxels along the Y axis.	X
6	NumberOfVoxelsZ	IfcPositiveInteger		NumberOf voxels along the Z axis.	X
7	Voxels	IfcBoolean	A[1:NumberOfVoxelsXNumberOfVoxelsYNumberOfVoxelsZ]	Indication of voxels on the grid. The array is one-dimensional where values are distributed in the following order: along X, then Y and finally Z.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items. IFC2x3 CHANGE The inverse attribute LayerAssignments has been added. IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcTessellatedItem
	HasColours	IfcIndexedColourMap @MappedTo	S[0:1]	Reference to the indexed colour map providing the corresponding colour RGB values to the faces of the subtypes of IfcTessellatedFaceSet.	X
IfcVoxelGrid
1	VoxelSizeX	IfcNonNegativeLengthMeasure		Size of voxels in the X axis.	X
2	VoxelSizeY	IfcNonNegativeLengthMeasure		Size of voxels in the Y axis.	X
3	VoxelSizeZ	IfcNonNegativeLengthMeasure		Size of voxels in the Z axis.	X
4	NumberOfVoxelsX	IfcPositiveInteger		Number of voxels along the X axis.	X
5	NumberOfVoxelsY	IfcPositiveInteger		Number of voxels along the Y axis.	X
6	NumberOfVoxelsZ	IfcPositiveInteger		NumberOf voxels along the Z axis.	X
7	Voxels	IfcBoolean	A[1:NumberOfVoxelsXNumberOfVoxelsYNumberOfVoxelsZ]	Indication of voxels on the grid. The array is one-dimensional where values are distributed in the following order: along X, then Y and finally Z.	X

Formal representations

XML Specification

 <xs:element name="IfcVoxelGrid" type="ifc:IfcVoxelGrid" substitutionGroup="ifc:IfcTessellatedItem" nillable="true"/>

 <xs:complexType name="IfcVoxelGrid">

  <xs:complexContent>

   <xs:extension base="ifc:IfcTessellatedItem">

    <xs:attribute name="VoxelSizeX" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>

    <xs:attribute name="VoxelSizeY" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>

    <xs:attribute name="VoxelSizeZ" type="ifc:IfcNonNegativeLengthMeasure" use="optional"/>

    <xs:attribute name="NumberOfVoxelsX" type="ifc:IfcPositiveInteger" use="optional"/>

    <xs:attribute name="NumberOfVoxelsY" type="ifc:IfcPositiveInteger" use="optional"/>

    <xs:attribute name="NumberOfVoxelsZ" type="ifc:IfcPositiveInteger" use="optional"/>

    <xs:attribute name="Voxels" use="optional">

     <xs:simpleType>

      <xs:restriction>

       <xs:simpleType>

        <xs:list itemType="ifc:IfcBoolean"/>

       </xs:simpleType>

       <xs:minLength value="0"/>

      </xs:restriction>

     </xs:simpleType>

    </xs:attribute>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcVoxelGrid

 SUBTYPE OF (IfcTessellatedItem);

  VoxelSizeX : IfcNonNegativeLengthMeasure;

  VoxelSizeY : IfcNonNegativeLengthMeasure;

  VoxelSizeZ : IfcNonNegativeLengthMeasure;

  NumberOfVoxelsX : IfcPositiveInteger;

  NumberOfVoxelsY : IfcPositiveInteger;

  NumberOfVoxelsZ : IfcPositiveInteger;

  Voxels : ARRAY [1:NumberOfVoxelsX*NumberOfVoxelsY*NumberOfVoxelsZ] OF IfcBoolean;

END_ENTITY;

 EXPRESS-G diagram