213 Copyright Goodheart-Willcox Co., Inc. Learning Objectives After completing this chapter, you will be able to: ✓ Explain tessellation divisions and values. ✓ Create mesh primitives. ✓ Create a smoothed mesh object. ✓ Create a refi ned mesh object. ✓ Generate a mesh by converting a solid or surface. ✓ Generate a solid or surface by converting a mesh. ✓ Execute editing techniques on mesh objects. ✓ Create a split face on a mesh. ✓ Produce an extruded mesh face. ✓ Apply a crease to mesh subobjects. ✓ Create and close mesh object gaps. ✓ Create a new mesh face by collapsing a mesh face or edge. ✓ Merge mesh faces to form a single mesh face. ✓ Construct a new mesh face by spinning a triangular mesh face. Overview of Mesh Modeling Overview of Mesh Modeling Mesh primitives can be used to create freeform designs. See Figure 9-1. The tools for creating and editing meshes extend the capability of AutoCAD’s 3D modeling tools. There are two key workfl ows that the designer considers: • The creation of 3D models, which can be solids, surfaces, or meshes. • Editing the 3D models to create unique shapes. Mesh models can be created as mesh primitives, mesh forms, or freeform mesh shapes. A mesh model consists of vertices, edges, and faces. You can modify a mesh by adjusting the smoothness or by adding creases, extrusions, splits, and gaps. You can also distort a mesh to create unique freeform shapes. A mesh model is a type of surface model. Subdivision surfaces is another term for mesh models. Mesh models do not have volume or mass. Rather, mesh models only defi ne the shape of the design. Mesh Modeling CHAPTER 9 9