Using a Coordinate System to Define a Bounding Box You can define a bounding box using a coordinate system. For a rectangular bounding box, you can specify the X, Y, and Z axes for length, width, and thickness. For a cylindrical bounding box, you can specify one of the X, Y, and Z axes for the axis of the cylinder. To use a coordinate system to define a rectangular bounding box: Open a model, and click Insert > Reference Geometry > Bounding Box . In the PropertyManager, under Type of Bounding Box, select Rectangular. Under Reference Face/Plane, select Coordinate System and select a coordinate system.A rectangular bounding box is created. The edges are parallel to the X, Y, and Z axes of the coordinate system. To change the axis for a direction, select Fix directions and select an axis for a direction: Length Specifies the axis for length. Width Specifies the axis for width. Thickness Specifies the axis for thickness. To use a coordinate system to define a cylindrical bounding box: In the PropertyManager, under Type of Bounding Box, select Cylindrical. Under Reference Face/Plane, select Coordinate System and select a coordinate system.A cylindrical bounding box is created. The axis is parallel to one of the X, Y, or Z axes of the coordinate system with the Z axis as the default axis. To change the axis direction, select Fix directions and select an axis: Axis Specifies the axis for the cylindrical bounding box. Parent topicParts and Features