Drawings & Sheets

Introduction

Drawings & Sheets concern the ability to capture 2D representations of Entities that are widely used in detailed-design phases of infrastructure assets, as means of documenting and communicating decisions across teams and stakeholders. The BisCore schema contains several classes standardizing concepts, rules and patterns that enable capturing Drawings & Sheets in BIS repositories with a high-level of detail.

The following class diagram depicts the most basic classes from the BisCore schema involved in capturing a Drawing or a Sheet in a BIS repository. See Class-diagram Conventions for details about the conventions used.

Both the Drawing and Sheet classes mixin the ISubModeledElement interface, which advertises the expectation that they will be detailed in a submodel. A Drawing instance is expected to be submodeled by a DrawingModel while a Sheet instance is expected to be submodeled by a SheetModel. Drawing and Sheet instances are contained in one or more DocumentListModels.

Drawings

The following class diagram depicts the main classes from the BisCore schema involved in capturing a Drawing in a BIS repository. See Class-diagram Conventions for details about the conventions used.

Drawing

A Drawing is a 2D representation of Entities used to apply annotations, dimensions, callouts, and other embellishments.

SectionDrawing

A SectionDrawing is a specialized drawing generated from a 2D section of a spatial view. A SectionDrawing can be of one of four types, captured by its SectionType property: Section, Detail, Elevation or Plan.

For additional settings about a ViewAttachment that can be captured in its JsonProperties attribute as JSON, please see SectionDrawingProps.

SectionDrawingLocation

A SectionDrawingLocation, as a base class of bis:SpatialLocationElement, captures the spatial location of a section drawing generated from a SpatialViewDefinition. An SectionDrawingLocation instance refers to the view generated from a SpatialViewDefinition, typically a DrawingViewDefinition, via its SectionView navigation property.

The associated SectionDrawing can be found via the BaseModel navigation property on the DrawingViewDefinition that a SectionDrawingLocation refers to, as shown in the following class-diagram. See Class-diagram Conventions for details about the conventions used.

Sheets

Sheet

A sheet is a document that captures one or multiple views of a BIS repository into a 2D representation that is optimized for drawing production, serving as an electronic drawing sheet.

The following class diagram depicts the main classes from the BisCore schema involved in capturing a Sheet in a BIS repository. See Class-diagram Conventions for details about the conventions used.

ViewAttachment

A ViewAttachment is a GraphicalElement2d element that attaches a particular ViewDefinition into a Sheet. Instances of ViewAttachment are contained in the SheetModel of the Sheet it attaches a ViewDefinition into. The BBoxLow and BBoxHigh properties of a ViewAttachment specify the placement of the attachment into its Sheet.

For additional settings about a ViewAttachment that can be captured in its JsonProperties attribute as JSON, please see ViewAttachmentProps.

DrawingViewDefinition

A DrawingViewDefinition specifies parameters for a view of a DrawingModel. For additional settings about a DrawingViewDefinition that can be captured in its JsonProperties attribute as JSON, please see ViewDetailsProps.

SpatialViewDefinition

A SpatialViewDefinition specifies parameters for a view of a spatially-located volume. For additional settings about a SpatialViewDefinition that can be captured in its JsonProperties attribute as JSON, please see ViewDetails3dProps.

Sheet Index

A sheet index is a structured collection of sheets in a BIS repository. A sheet index can link any sheet in a BIS repository and organize them hierarchically into folders.

The following class diagram depicts the main classes from the BisCore schema involved in capturing a Sheet Index in BIS repositories. See Class-diagram Conventions for details about the conventions used.

Instances of SheetIndexEntry subclasses (i.e. SheetReferences, SheetIndexFolders and SheetIndexReferences) as well as SheetIndex instances are contained in SheetIndexModels, who further models a SheetIndexPartition. The displayed order of SheetIndexEntry instances per SheetIndex or SheetIndexFolder can be controlled by assigning their EntryPriority property accordingly.

Last Updated: 03 October, 2023