{"id":3795,"date":"2023-08-21T17:21:22","date_gmt":"2023-08-21T22:21:22","guid":{"rendered":"https:\/\/schallertech.com\/isoptic-the-key-to-achieving-good-visibility-in-your-auditorium\/"},"modified":"2023-08-21T17:21:22","modified_gmt":"2023-08-21T22:21:22","slug":"isoptic-the-key-to-achieving-good-visibility-in-your-auditorium","status":"publish","type":"post","link":"https:\/\/schallertech.com\/en\/isoptic-the-key-to-achieving-good-visibility-in-your-auditorium\/","title":{"rendered":"Isoptic: The Key to Achieving Good Visibility in Your Auditorium"},"content":{"rendered":"

What is Isoptic and Why is it Important for Auditorium Design?<\/span><\/h2>\n

Isoptic is a condition of equal visibility for the audience, allowing spectators to fully view a specific area. For example, a theater stage, a movie screen, or a conference podium. <\/span><\/p>\n

Isoptic is important for auditorium design<\/a> because it ensures that all attendees can enjoy the show without visual obstructions or distortions of the image. In addition, good isoptic improves the comfort and safety of the spectators, as it prevents them from having to strain their eyes or adopt uncomfortable postures to see better.<\/span><\/p>\n

To achieve good isoptic, several factors influencing visibility must be considered, such as anthropometry, furniture, viewing angle, and point of interest. Anthropometry refers to human body measurements, like height, width, and depth. <\/span><\/p>\n

Furniture refers to the elements placed in the auditorium to accommodate the spectators, like chairs, tables, or seats. The viewing angle refers to the angle formed by the spectator’s eye with the point of interest and the boundaries of the auditorium. The point of interest refers to the place where the main show or activity takes place.<\/span><\/p>\n

The aim of this article is to explain how to calculate the isoptic and show you some examples of auditoriums with good isoptic. For this, we will distinguish between two types of isoptic: vertical and horizontal. <\/span><\/p>\n

Vertical isoptic deals with the height or difference in elevation between rows of seats, while horizontal isoptic deals with the width or radius of the auditorium. Both are necessary to achieve optimal visibility from any point in the auditorium.<\/span><\/p>\n

How is Vertical Isoptic Calculated?<\/span><\/h2>\n

The objective of vertical isoptic is to find convenient heights or elevation differences for the design of the stands or rows of seats. Its calculation defines the ascending curve generating the stepping of the floor between rows of observers that will allow achieving good visibility. Through mathematical methods, the isoptic line can be obtained with the following formula:<\/span><\/p>\n

h’= (d’ (h+k) ) \/ d<\/span><\/p>\n

Where h’ represents the eye height of the spectator, d’ is the distance of the spectator to the base point for plotting, h is the eye height of the spectator preceding the one being calculated, k is a constant indicating the level difference between the eye and the top of the head, and d is the distance from the base point for plotting to the spectators located in the row prior to the one being calculated.<\/span><\/p>\n

To better understand this formula, you can view the following diagram that shows the variables involved:<\/span><\/p>\n

\"Isoptic

As you can see, the base point for the tracing is the lowest point of the stage or area of interest. From this point, a straight line is drawn to the eye of the first viewer (row 1). Another straight line is then drawn from the same point to the eye of the second viewer (row 2). The difference between both lines determines the height or level difference needed between the rows to achieve good visibility.<\/span><\/p>\n

The recommended values for the variables depend on the type of auditorium and the kind of event being held. For example, for a theater-style auditorium, where the stage is elevated and the point of interest is the actors’ heads, it’s recommended that the height of the viewer’s eye be 3.61 feet, the constant k be 0.39 feet, and the viewer’s distance to the base point be 49.21 feet. For a cinema-style auditorium, where the screen is at floor level and the point of interest is the center of the screen, it’s recommended that the height of the viewer’s eye be 3.44 feet, the constant k be 0.33 feet, and the viewer’s distance to the base point be 32.81 feet.<\/span><\/p>\n

To exemplify the vertical isoptic calculation, let’s take the case of an auditorium with 10 rows of seats and a stage 49.21 feet away. We’ll assume it’s a theater-type auditorium, so we’ll use the recommended values for that type. Applying the formula, we get the following results:<\/span><\/p>\n