API Reference > imodeljs-common > Geometry > GeometryPartInstanceProps > rotation rotation rotation: undefined | YawPitchRollProps Optional rotation relative to element's placement, 0.0,0.0,0.0 if undefined. For a 2d element/rotation, supply a non-zero yaw angle only Defined in core/common/src/geometry/GeometryStream.ts Line 144 Last Updated: 13 June, 2024