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UnitSystem Enumeration

ON::LengthUnitSystem identifies a length unit system United States customary length units references: http://www.nist.gov/pml/wmd/metric/upload/frn-59-5442-1959.pdf http://en.wikipedia.org/wiki/United_States_customary_units http://en.wikipedia.org/wiki/International_yard_and_pound

Namespace:  Rhino
Assembly:  RhinoCommon (in RhinoCommon.dll)
Syntax
public enum UnitSystem
Members
  Member nameValueDescription
None0 ON::LengthUnitSystem::None indicates no length unit system. The scale factor when converting between a specified unit system and None is always 1.0. ON::LengthUnitSystem::None is used as a unit system for models and instance defitions that should be imported or referenced with no scaling applied.
Angstroms12 1 angstroms = 1.0e-10 meters
Nanometers13 1 nanometer = 1.0e-9 meters
Microns1 1 micron = 1.0e-6 meters
Millimeters2 1 millimeter = 1.0e-3 meters
Centimeters3 1 centimeter = 1.0e-2 meters
Decimeters14 1 decimeter = 1.0e-1 meters
Meters4 SI meter length unit
Dekameters15 1 dekameter = 1.0e+1 meters
Hectometers16 1 hectometer = 1.0e+2 meters
Kilometers5 1 kilometer = 1.0e+3 meters
Megameters17 1 megameter = 1.0e+6 meters
Gigameters18 1 gigameter = 1.0e+9 meters
Microinches6 1 microinches = 2.54e-8 meters = 1.0e-6 inches
Mils7 1 mil = 2.54e-5 meters = 0.001 inches
Inches8 1 inch = 0.0254 meters = 1/12 foot
Feet9 1 foot = 0.3048 meters (12 inches)
Yards19 1 foot = 0.3048 meters = 12 inches
Miles10 1 US statute mile = 1609.344 meters = 5280 feet
PrinterPoint20Printer distance 1/72 inches (computer points).
PrinterPica21Printer distance 1/6 inches (computer picas).
NauticalMile22 Terrestrial distance, 1852 meters.

Approximately 1 minute of arc on a terrestrial great circle. See http://en.wikipedia.org/wiki/Nautical_mile .

Astronomical23 Astronomical unit distance. http://en.wikipedia.org/wiki/Astronomical_unit 1.495979e+11 // http://units.nist.gov/Pubs/SP811/appenB9.htm An astronomical unit (au) is the mean distance from the center of the earth to the center of the sun.
Lightyears24 Light Year

http://en.wikipedia.org/wiki/Light_year 9.46073e+15 meters http://units.nist.gov/Pubs/SP811/appenB9.htm

A light year is the distance light travels in one Julian year. The speed of light is exactly 299792458 meters/second. A Julian year is exactly 365.25 * 86400 seconds and is approximately the time it takes for one earth orbit.

Parsecs25 1 parsec = 3.08567758e+16 meters References: http://en.wikipedia.org/wiki/Parsec (3.08567758e+16 meters) http://units.nist.gov/Pubs/SP811/appenB9.htm (3.085678e+16)
CustomUnitSystem11 Custom unit systems x meters with x defined in ON_3dmUnitsAndTolerances.m_custom_unit_scale.
PrinterPoints20 1 printer point = 1/72 inch
PrinterPicas21 1 printer pica = 1/6 inch
NauticalMiles22 1 nautical mile = 1852 meters Approximately 1 minute of arc on a terrestrial great circle. Reference: http://en.wikipedia.org/wiki/Nautical_mile
AstronomicalUnits23 1 astronomical unit = 1.4959787e+11 meters An astronomical unit (au) is the mean distance from the center of the earth to the center of the sun. References: http://en.wikipedia.org/wiki/Astronomical_unit (1.4959787e+11 meters) http://units.nist.gov/Pubs/SP811/appenB9.htm (1.495979e+11 meters)
LightYears24 1 light year = 9.4607304725808e+15 meters A light year is the distance light travels in one Julian year. The speed of light is exactly 299792458 meters/second. A Julian year is exactly 365.25 * 86400 seconds and is approximately the time it takes for one earth orbit. References: http://en.wikipedia.org/wiki/Light_year (9.4607304725808e+15 meters) http://units.nist.gov/Pubs/SP811/appenB9.htm (9.46073e+15 meters)
CustomUnits11 The name of a custom unit and the conversion to meters are saved in the ON_UnitSystem class.
Unset255 The ON::LengthUnitSystem::Unset is used to indicate no unit system is set. This is a differnt condition from ON::LengthUnitSystem::None.
Version Information

Rhino for Mac

Supported in: 5.4

Rhino for Windows

Supported in: 6.6
See Also