Learn in the textbookApplications of 3D and Video Media
Definition3D (three-dimensional) is a way of representing objects as solid forms by adding depth to height and width.
ExplanationIn computer-drawn 3D (3DCG), an object's shape is stored as shape data that includes depth, and its appearance is calculated from the viewing position and light direction before it is drawn on screen. Because the shape itself is stored, the viewpoint can change and the viewer can move freely through the space. This property is what the simulators and games covered next are built on.
AnalogyA house drawn on paper has no back to look at, but a clay model of a house can be turned in your hand to see its back and the top of its roof.
Memory hookThe D stands for Dimension, so 3D means 'three dimensions'.