Visual Realism (Visualization) can be defined as technique for creating images, diagrams or animations to communicate ideas.

It concentrates basically on visual appearance of objects.

Projection and shading are two most common methods of visualizing geometric models.

Orthographic projection is one of the oldest methods.

Orthographic projection is difficulty in interpreting various views and also time consuming.

CAD use isometric and perspective projection in addition to orthographic projections for generating rich visual images with complete design information.

Visual realism can also convey appearance characteristics of the model such as color and texture.

Three process sequence in model clean-up

1. Generating orthographic views of the model.

2. Eliminating hidden lines in each view by applying visual realism principle.

3. Changing the necessary hidden lines are dashed lines.