The document discusses common 2D and 3D CAD commands. In 2D CAD, commands allow users to draw grids, shapes, layers, and perform actions like zooming, copying, rotating, scaling, and mirroring objects. 3D CAD allows creating wireframe, surface rendered, and photorealistic models and performing operations like combining, subtracting, and adding shapes. Key benefits of 3D CAD include producing realistic designs and orthographic views quickly without needing physical models.

1. Graphic Communication Common 2D & 3D CAD Commands

3. 2D CAD Commands - Grids Orthographic projection grid Isometric projection grid Iso top Iso left Iso right

14. 2D CAD Commands - Ring Arrays This is an example of a ring array with the instruction box shown alongside.

20. 2D CAD Commands - Trim We will trim these 2 lines to the box, one will extend to reach the edge and one will be shortened to meet the edge. Shortened line Extended line