What is an Index Vector?
In filmmaking, the use of various vectors to showcase the movement of objects. Or the direction in which motions are to take place are common. In fact, the use of various vectors are represented in filmmaking. Such that different vectors show us how to plan shots and decide upon the placement of various elements. Including cast, cameras and equipment on the set. But what is an index vector and what is the purpose?
Types of Vectors
There are three main types of vectors that are used to help us showcase. Where attention should be focused and what is most important on the screen.
Vectors define the location of important action taking place and they help filmmakers to plan shots as they decide on the placement of equipment as well as cast and other elements.
These three types of vectors include:
- Index vectors
- Motion vectors
- Graphic vectors
Each of these vectors play an essential role in defining the placement of items, objects, equipment and people within the space and the screen.
What is an Index Vector?
Index vectors, or IV, represent the widest, weak-strong range of pointing. In that, they are represented by an actual arrow that points in the direction that the individuals being filmed in a shot are actually looking.
So, for instance, if a group of people in a shot are looking west, toward the third tree on a property, the index vector is going to point, on the screen, to that third tree in the west of the property.
Audience Perception
So when someone asks, “What is an index vector?” The best answer is that index vectors, act like pointers. And, in fact include actually pointing, in the direction of where a filmed individual is looking or should be looking.
Index vectors can be used to help the film crew define converging elements. As well as to indicate how converging shots will appear as the film plays out.
Diverging index vectors, those that point away from one another, can be used to help the audience perceive different shots, despite a simultaneous event.
Once an index vector is pre-established, the line along which the vectors converge or where they diverge, is used for the purpose of continuity editing in filmmaking.