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Sightline Curve and Auditorium Rake

12 June 2026

Sightline Curve and Auditorium Rake

Why does the floor in a good cinema auditorium rise steeply toward the back? The answer lies in C-value - the measure of how much the sightline clears the head of the person in the row ahead. We explain the rake principle and how our calculator finds the optimal slope for any auditorium.

Sightline and rake calculator - XC tech

Why the seating rake matters

A good view of the screen is not just about how the seats are arranged. The rake (slope) of the seating matters too: it ensures every viewer sees the bottom edge of the screen above the heads of the row in front.

This visibility is described by the C-value parameter. It states by how much the sightline clears the head of the person sitting in front of you. The higher the C-value, the better the view of the screen and the viewing comfort.

How the calculator helps

Our calculator computes the optimal seating rake from the auditorium dimensions, the screen size and position, the row spacing and the required C-value.

The result is a row-by-row overview that helps verify whether every viewer has an adequate view of the screen. That lets you adjust the auditorium parameters before construction and avoid visibility problems.

Planning a cinema digitalisation or upgrade?

We will prepare a free, no-obligation consultation and project study. We will get back to you as soon as possible.