Proscenium Opening Ratio Lookup

Audit measured proscenium proportions against caller design brief, not a universal preferred opening or architectural safety criterion.

Description

Proscenium proportions compare measured opening width and height with a chosen design brief.

Proscenium proportions compare measured opening width and height with a chosen design brief. A preferred ratio is project-specific.^[1]

Enter positive dimensions/target and nonnegative tolerance. Return ratio, signed deviation and inclusive flag.

When to use Proscenium Opening Ratio Lookup

Use Proscenium Opening Ratio Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. No universal opening ratio or architectural safety criterion is supplied.

Prepare the actual venue, production, inventory or financial records requested. Confirm units and supply applicable local limits or verified catalog values.

How to use Proscenium Opening Ratio Lookup and understand its results

Prepare the actual venue, production, inventory or financial records requested. Confirm units and supply applicable local limits or verified catalog values.
Enter openingWidthM, openingHeightM, callerDesignAspectRatio, callerAspectTolerance using the field table and calculation rules, then run the tool.
Read observedOpeningAspectRatio, signedAspectDeviation, withinCallerAspectPolicy. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
openingWidthM	Opening width m	number	Required
openingHeightM	Opening height m	number	Required
callerDesignAspectRatio	Caller design aspect ratio	number	Required
callerAspectTolerance	Caller aspect tolerance	number	Required

Enter positive dimensions/target and nonnegative tolerance. Return ratio, signed deviation and inclusive flag.

ratio=width/height; pass=abs(ratio−target)≤tolerance

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
observedOpeningAspectRatio	Observed opening aspect ratio	number
signedAspectDeviation	Signed aspect deviation	number
withinCallerAspectPolicy	Within caller aspect policy	boolean

json

{
  "input": {
    "openingWidthM": 8,
    "openingHeightM": 4,
    "callerDesignAspectRatio": 2,
    "callerAspectTolerance": 0.1
  },
  "output": {
    "observedOpeningAspectRatio": 2,
    "signedAspectDeviation": 0,
    "withinCallerAspectPolicy": true
  }
}

Limitations and assumptions

No universal opening ratio or architectural safety criterion is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.

Alternative or Complementary methods

Use Stage Depth Thrust Extension Lookup: An abutting thrust extension adds a separate rectangular playing area to the main stage. Its area share differs from longitudinal depth share. For a complementary task, use Border Mask Height Sightline Calculator: A border-plane sightline is an interpolation along a supplied eye-to-target ray. A local 2D test cannot capture every viewing path.

References

Proscenium Opening Ratio Lookup — tool.io

Similar or alternative tools

Stage Depth Thrust Extension Lookup
An abutting thrust extension adds a separate rectangular playing area to the main stage. Its area share differs from longitudinal depth share.
Border Mask Height Sightline Calculator
A border-plane sightline is an interpolation along a supplied eye-to-target ray. A local 2D test cannot capture every viewing path.