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UnitSystem

UnitSystem enum

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
UnitSystem: references

Values

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.

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