UnitSystem
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 UnitSystemMembers
Member name
Value
Description
None
0
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 definitions that should be imported or referenced with no scaling applied.
Angstroms
12
1 angstroms = 1.0e-10 meters
Nanometers
13
1 nanometer = 1.0e-9 meters
Microns
1
1 micron = 1.0e-6 meters
Millimeters
2
1 millimeter = 1.0e-3 meters
Centimeters
3
1 centimeter = 1.0e-2 meters
Decimeters
14
1 decimeter = 1.0e-1 meters
Meters
4
SI meter length unit
Dekameters
15
1 dekameter = 1.0e+1 meters
Hectometers
16
1 hectometer = 1.0e+2 meters
Kilometers
5
1 kilometer = 1.0e+3 meters
Megameters
17
1 megameter = 1.0e+6 meters
Gigameters
18
1 gigameter = 1.0e+9 meters
Microinches
6
1 microinches = 2.54e-8 meters = 1.0e-6 inches
Mils
7
1 mil = 2.54e-5 meters = 0.001 inches
Inches
8
1 inch = 0.0254 meters = 1/12 foot
Feet
9
1 foot = 0.3048 meters (12 inches)
Yards
19
1 foot = 0.3048 meters = 12 inches
Miles
10
1 US statute mile = 1609.344 meters = 5280 feet
PrinterPoints
20
1 printer point = 1/72 inch
PrinterPicas
21
1 printer pica = 1/6 inch
NauticalMiles
22
1 nautical mile = 1852 meters Approximately 1 minute of arc on a terrestrial great circle. Reference: http://en.wikipedia.org/wiki/Nautical\_mile
AstronomicalUnits
23
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)
LightYears
24
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)
Parsecs
25
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)
CustomUnits
11
The name of a custom unit and the conversion to meters are saved in the ON_UnitSystem class.
Unset
255
The ON::LengthUnitSystem::Unset is used to indicate no unit system is set. This is a different condition from ON::LengthUnitSystem::None.