API Reference > imodeljs-common > Symbology > GeometryClass GeometryClass Enumeration Categorizes a piece of geometry within a GeometryStream. Visibility of classes of geometry can be toggled within a view using ViewFlags. see GeometryStreamProps. see Feature. Members Name Value Description Primary 0 Used to classify the "real" geometry within a model. Most geometry falls within this class. Construction 1 Used to classify geometry used as a drawing aid in constructing the Primary geometry. For example, grid lines. Dimension 2 Used to classify annotations which dimension (measure) the Primary geometry. Pattern 3 Used to classify geometry used to fill planar regions with a 2d pattern (e.g., hatch lines). Defined in core/common/src/GeometryParams.ts Line 48 Last Updated: 11 June, 2024