Permalink Reply by Michael Freytag on February 15, 2012 at 11:23pm

How To Change Units In Rhino For Mac Os
How To Change Units In Rhino For Mac Air

Bklevickas 2014-12-11. Unable to change units from centimeters to feet I do it in the settings window but it does not change when I analyze a distance.
Select a curve and left click the carrot labeled “line type” in the properties tab, to change the line type. For the purpose of this tutorial please select hidden. Hidden should be a dashed line.
To view or change keyboard shortcuts In the Options dialog box, on the Keyboard page, type a shortcut for a key. Note: Rhino menus list the default keyboard shortcuts. If you change a command to a different shortcut, the menus do not update to reflect this change. Other shortcuts.

Nick,

Unfortunately, there isn't currently a way to change the analysis units once they've been established.

If you need a different unit, you can change the unit but let rhino scale the file. If you already are in your desired unit, you can also use 3D scale with the corresponding scale factor (0.1 in your case) and scale around the origin point. Or you can always reimport/open the file and use the correct unit when importing.

You can explode the model to clear out the Scan&Solve data and join it back together to establish the new units. Of course you'll have to re-apply the restraints, loads and other settings.

Out of curiosity, if Scan&Solve would modify the analysis units to always match the Rhino units (scaling the loads into the new units), would this be acceptable behavior?

~Michael

EDIT: See my reply below.

Permalink Reply by Bob Johansson on February 26, 2012 at 6:29pm

HI:

It sounds like Scan and Solve is missing a 'clear results' command which

clears the current analysis results without having to re-apply the loads, contraints

or other settings.

So you would clear the current analysis results.

Change the units

Then do a new analysis

Thx,

Bob

Permalink Reply by Michael Freytag on February 27, 2012 at 11:27am

All,

How To Change Units In Rhino For Mac Os

Regarding 'clear results,' the [Purge] button on the Specify tab will clear solution results. It won't do anything for changes in units.

Try the latest version (1.4.1.8). It checks for a change in units in the Rhino document and prompts the user for guidance. It will also warn if unsupported length units are being used to model the geometry.

~Michael

Permalink Reply by Nick on February 27, 2012 at 5:56pm

Thanks Michael. Since this is probably a rare occurrence it isn't necessary to have a feature for changing units.

Maybe a units item in the results tab and displaying the reaction forces will be enough to alert users to any inconsistencies. I only picked up on it when I checked the weight of the item. Those things are our human checks to see if it is being modelled and solved correctly, they're things that a computer can't really comprehend.

regards,

Nick.

Where can I find this command?

Toolbars

File
Properties
Standard

Menus

File

Model units properties manage the units settings for the current model space.

Layout units properties manage the layout units for the current layout space.

Units and tolerances

Model units

Controls the units used in the model.

Layout units

Controls the units used in the layouts.

Note: When you change from one units system to another, Rhino asks if you want to have the geometry automatically scaled to match the unit change.

Absolute tolerance

Tolerance in units used when creating new geometry that cannot be absolutely accurate. For example, trimming surfaces, doing offsets and Boolean operations usually create approximate geometry.

Relative tolerance

Sets the relative tolerance used in some commands. If, in those commands, the relative tolerance is smaller than the absolute tolerance setting, the relative tolerance is used instead.

Angle tolerance

Sets the angle tolerance in some commands use to create, modify, or evaluate geometry.

When creating or modifying geometry the angle between two objects will be less than or equal to the tolerance value.

Two objects will meet an evaluation criterion, such as tangency, when the angle between them is less than the tolerance value.

Custom units

Name

The unit name.

Units per meter

Enters a scale in units per meter.

Distance display

Sets the distance display for the status bar and distance and length commands.

Decimal

Sets the display to decimal (1.25).

Fractional

Sets the display to fractional (1-1/4).

Feet & Inches

Sets the display to feet and inches (1'-3').

Display precision

Sets the number of decimal places for the distance display.

Note

●	It is best to select a tolerance when you start modeling and stick with it.

●	Importing a model in a format that supports units and tolerances will not adjust Rhino's units or tolerances. A dialog box will warn you if the units do not match.

●	The following three items are a good guide to choosing tolerances.

●

Rhino can work in any unit system and with any tolerance. The default unit system is millimeters, and the default tolerance is 0.01 millimeters. You can change the default unit system or tolerance by setting up a template. If you frequently need to work in more than one unit system or with more than one tolerance, set multiple templates.

●	In general, Rhino works best if you choose a unit system whose absolute tolerance is around 0.01 to 0.001, the 'size' of a small feature (like a tiny fillet or small curve offset distance) is >= 10 x tolerance, and the 'size' of the model is <= 100000.

●	Using an absolute tolerance that is smaller than 0.0001 will noticeably slow some intersection and fitting processes.

Distance units

Use any of the Rhino unit measurements including fractions. You can mix fractional and decimal input.

Microns

1.2mic

1.2micron(s)

Millimeters

1.2mm

1.2millimeter(s)

Centimeters

1.2c

1.2cm

1.2centimeter(s)

Meters

1.2m

1.2meter(s)

Kilometers

1.2km

1.2kilometer(s)

Microinches

1.2microinch(es)

Mils

1.2mil(s)

Feet and Inches

1in

1inch(es)

1'2-1/2(')

1'2.2(')

1-1/2'

1.5'

1ft

1foot

1feet

Miles

1mi

1mile(s)

Other

Angstrom

Nanometer

Decimeter

Dekameter

Hectometer

Megameter

Gigameter

Yard

Printer point

Printer pica

Nautical mile

Astronomical unit

Lightyear

Parsec

Angle units

Use any of the Rhino angle unit measurements including fractions. You can mix input types.

The direction for 0 degrees is 3 o'clock. Positive angular measurement is counterclockwise.

Decimal Degrees

The '°' symbol can be used, but it is easier to just type d.

45 (If no units are specified, then degrees are assumed.)

45°

45d

39deg

22.875degs

12.345e2degree

180degrees

47.653395°

Degrees/minutes/seconds

128d37'22'

128°37'22'

99d37'45.234'

32.543'

32'30.1234'

Radians (1πr=180°)

3.1415926535897932384626433832795r (pi radians)