# BeamSectionGeometry (sec-beamsectiongeometry)= ## BeamSectionGeometry Data structure for definition of 2D and 3D beam (cross) section geometrical properties. Used for visualization and contact. BeamSectionGeometry has the following items: ```{tabularcolumns} \Y{0.26}\Y{0.12}\Y{0.14}\Y{0.48} ``` | name | type | default | description | |---|---|---|---| | `crossSectionRadiusY` | UReal | 0. | $c_Y\,$ [SI:m] $Y$ radius for circular cross section | | `crossSectionRadiusZ` | UReal | 0. | $c_Z\,$ [SI:m] $Z$ radius for circular cross section | | `crossSectionType` | CrossSectionType | CrossSectionType::Polygon | Type of cross section: Polygon, Circular, etc. | | `polygonalPoints` | Vector2DList | | $\pv_{pg}\,$ [SI: (m,m) ] list of polygonal ($Y,Z$) points in local beam cross section coordinates, defined in positive rotation direction |