4.4     2D Geometries

Generally, a 2D geometry is considered as the starting-point for most CAD models - a simple 2D sketch can be used for generating a 3D shape, further 2D sketches can be used to create pockets in the surface of this shape and to define 'pads' (extrusions) on the surface of 3D objects. Along with geometry transformations and boolean operations, the sketcher forms the core of generative solid shape design.

The Sketcher workbench itself features constraints - allowing 2D shapes to be constrained to precise geometrical definitions. And a constraint solver which calculates the constrained-extent of 2D geometry and allows interactive exploration of sketch degrees-of-freedom.

This chapter describes the following topics:

• General Overview

• Sketcher Operations

• Sketcher Geometries

• Sketcher Constraints

• Sketch Tools

• Good Practises