Practice Exercise - Drawing Basic Ortho Views SOLID Spatial Visualization Exercises - Developing Spatial Visualization Skills Drawing Views with Hidden Lines: In section 4 you will learn about the different types of lines that are used in engineering graphics. I'd like to introduce a type of line to you early: the hidden line. Hidden lines show edges that are hidden in a certain view. In the example below, notice the dotted line in the Right view. This is called a hidden line. The hidden line shows the (otherwise hidden) edge highlighted in the Isometric view. In the next examples, include hidden lines where are needed. TOP FRONT RIGHT