Herramientas prácticas para trabajos de precisión
Estimación de Línea de Visión y Graderío para Asientos de Cine
Estime la altura de cada grada necesaria para que la línea de visión libre la altura de cabeza asumida en la fila delantera.
Each row is raised only enough for its eye-to-screen-bottom line to clear the previous row's assumed head height plus the entered margin.
How it works
What this estimates: enter screen-bottom height, eye position, row spacing and a conservative head-plus-clearance allowance. The result is sightline geometry, not a structural platform design.
Method. Similar triangles solve the required eye height for each rear row, recursively using the raised row in front.
Example. Raising one row changes the obstruction for the next, so a three-row design cannot safely multiply one generic riser height.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Number of rows
- 3
- First row from screen
- 3 m
- Row spacing
- 1.1 m
- Seated eye above floor
- 1.05 m
- Head above eye
- 0.15 m
- Screen bottom height
- 0.65 m
- Sightline clearance
- 0.1 m
Primary result: Rear-row sightline height estimate: 1.04 m.
Before using the result
- Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
- Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
- When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.
Limitations
This is a sightline model, not structural or code design. Recliners, varied occupant heights, aisle steps, guardrails, ceiling clearance, accessibility, joists, loads and local building/fire codes require qualified design and approval.
Frequently asked questions
Can the screen be raised to reduce the riser?
Often, but excessive screen height can create uncomfortable vertical viewing angles. Evaluate both sightlines and neck comfort.
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