Autodesk 235B1-05A761-1301 User Guide - Page 674

references one of the planes of the extent. To define a reference work plane, you select a modifier and a source work plane that represents the plane direction you want to create. The extents, or boundary box, of the feature is detected, and 2 valid reference work planes are available for selection. If the modifier is moved or resized, the reference work plane is moved with it. Creating a reference work plane Geometry You construct a model bit by bit, building shapes to add to it and using tools to cut away the portions of the shapes you do not need. In Content Builder, these shapes are features of the part you are creating. Geometry features are the basic building blocks for defining the size and shape of the model. Geometry that you define is 2-dimensional (2D) and must be attached to a work plane. You can switch between work planes to define different geometry. As you add geometry to a work plane, the geometry features appear under the Geometry folder of the associated work plane. WARNING Avoid using basic AutoCAD® geometry commands. AutoCAD geometry is not valid for work planes and cannot be used to create features for parametric part models. Viewing geometry types Content Builder provides 9 types of geometry you can use to build the model: Point Defined by an X and Y coordinate. Line Defined by a position and a direction; constrained by a start point and endpoint. Unbounded Line Defined by a position and a direction; infinite in length because it has no constraining start point or endpoint. Circle Defined by a center point and a radius. Arc Defined by a center point and a radius; constrained by a start point and endpoint. Rectangle Defined by lines and points that are constrained to maintain start points and endpoints for each side and perpendicular angle. Oval Defined by lines, arc, and points that are constrained to create 2 arcs tangent to 2 lines, with defined start points and endpoints. 656 | Chapter 14 Customizing Catalog-Based Content