lengthv12

Lengthv12 is a versioned data format for encoding a single linear dimension used in computational geometry and computer-aided design. As the twelfth iteration of the Length encoding specification, lengthv12 provides a standardized approach to representing, serializing, and exchanging length values across software systems.

The canonical internal unit is nanometers, and a length value is stored as a 64-bit signed integer representing the magnitude in nanometers. To convey external units, the format includes a one-byte unit code that indicates how the value should be interpreted when presented to users. Length can be serialized in binary form or represented in a human-readable text form, where decimals with unit suffixes (for example 12.5 mm or 0.0125 m) are permitted.

Versioning and compatibility are core elements of lengthv12. The specification defines version tags, rounding rules, and conversion behavior to enable reliable data interchange between older and newer software components. It also documents supported subformats and extensions that may appear in future revisions while preserving backward compatibility where possible.

Adoption and use cases include 3D modeling pipelines, CAD data exchange, and geometry libraries that require precise, unit-aware length values. By embedding unit information alongside the magnitude, lengthv12 aims to reduce errors from unit mismatches during import and export.

Limitations include potential rounding during unit conversions and reliance on agreed-upon internal units. Some ecosystems may implement proprietary extensions, leading to partial interoperability. Users are advised to consult the official lengthv12 specification for supported units, ranges, and serialization rules when exchanging data.

See also: length, unit (measurement), fixed-point representation, data serialization.