4-D applications include:
• Video: the unedited recording of existing site conditions using a video camera;
• Simulated Phase Change: the process of illustrating the change that occurs from an
existing base image condition to the proposed composite image condition from the same
view-point and saved and played as a video sequence;
• Animation: a sequence of composite images that, when played at specific speeds,
produce the illusion of motion; and
• Real Time Simulated Graphics: the ability of a computer system to generate, display, and
update images in a continuous stream at the same time that data are entered, or as
commands to navigate a project are given.