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'''UU''' stands for '''Unreal Units'''. Any number that represents a distance in Unreal is given in these units. There's also '''RUU''', '''Rotational Unreal Unit''' (or '''Unreal Rotation Unit''', but it's easier to link RUU than URU ;) ). Often "UU" is used for both length and angle, and sometimes they are just called "units", or not given a name at all ("build a 256x256x64 box").

==Length==

The UnrealEd [[Legacy:Grid|grid]], dimensions of [[Legacy:Brush|brush]]es, positions of [[Legacy:Actor|actor]]s and sizes of [[Legacy:Collision Cylinder|collision cylinder]]s are all measured in these units. The [[Legacy:Unreal World|Unreal World]] can have a maximum size of 65536 UU (=2^16) in Unreal/UT. UT2003 and U2 have worlds of 524288 UU (=2^19). 

One UU doesn't actually ''mean'' anything, it's just something within the engine. An arbitrary scale is used for game programming because the scale may change from one game to another, one game may be an FPS, while another may be a space sim with several planets on an entire map. Each game picks a scale to work at: the size of players and objects, which means there is an effective conversion factor between UU and real physical units. In the Unreal series of games, this is generally held to be roughly:

* 256 UU  = 487.68 cm = 16 feet. 
* 1 meter = 52.5 UU
* 1 foot  = 16 UU
* 1 cm = 0.525 UU
* 1 UU = 0.75 inches

'''Sweavo:''' in ut2004, a 52.5 square space is just enough for a player to fit in.  I would increase all these numbers by 20% if making semi-realistic maps.

==Angle==

Some [[Legacy:UnrealScript|UnrealScript]] functions use radians, just to be awkward, or because they're ''always'' used with radians, such as trigonometric functions.

{|

|-
|'''Unreal Units'''
|'''Degrees'''
|'''Radians * &pi;'''
|'''Steps per circle''' 
|-
|1024
|5.625
|1/32
|64 (default step size of the rotation grid)
|-
|2730
|12
|1/12
|24 (not quite round, it's actually 2730.6666... )
|-
|8192
|45
|1/4
|8
|-
|16384
|90
|1/2
|4
|-
|24576
|135
|3/4
|2.66...
|-
|32768
|180
|1
|2
|-
|65536
|360
|2
|1 - full circle
|}

See also the rotation grid in [[Legacy:UnrealEd Advanced Options|UnrealEd Advanced Options]]->Editor->RotationGrid, set:

 

==Angle conversion constants==

<uscript>
const DegreeToMOA    = 60.0;           // 21600/360
const DegreeToRadian = 0.017453;       // pi/180
const DegreeToURot   = 182.044449;     // 65536/360

const MOAToDegree    = 0.016667;       // 360/21600
const MOAToRadian    = 0.000291;       // pi/10800
const MOAToURot      = 3.034074;       // 65536/21600

const RadianToDegree = 57.295776;      // 180/pi
const RadianToMOA    = 3437.746582;    // 10800/pi
const RadianToURot   = 10430.377930;   // 32768/pi

const URotToDegree   = 0.005493;       // 360/65536
const URotToMOA      = 0.329590;       // 21600/65536
const URotToRadian   = 0.000096;       // pi/32768
</uscript>

==Conversion utilities ==

If you want to use a handy unit conversion, you can use a [[Legacy:Scripting Operators|postoperator]] for this, like so:

<uscript>
const Meter=52.5;

// These can be somewhere fairly global...
static final postoperator float Meters( float Units )
{ return Units * Meter; }

static final postoperator float MPS( float Units )
{ return Units Meters; }

function SetSomething()
{
  SetCollisionSize( 5 Meters, 3 Meters );
  Velocity = Vector( Rotation ) * 5 MPS;
}
</uscript>

See [[Legacy:Useful Maths Functions|Useful Maths Functions]] for angle conversion factors.

Two handy javascript unit converters:
* UU_Convert (2002)
** (does anyone have updated links for this? These are dead. -gblues)
** for linear units: [http://home.wanadoo.nl/ariadohq/tutes/uu_convert.html dead link]
** for angular units: [http://home.wanadoo.nl/ariadohq/tutes/ruu_convert.html dead link]
*** Standalone version/utility: [http://home.wanadoo.nl/ariadohq/tutes/uuc.zip dead link]
***  Feature list (warning: pop-ups): http://www.angelfire.com/games3/thealien/util_ut.html
* REAL2UNREAL (2004)
**  for linear and angular units: http://streamlab.info/real2unreal/
*** Standalone version/utility: http://streamlab.info/download/real2unreal-0.3b.zip

==Related Topics==
* [[Legacy:Movement Metrics (UT)|Movement metrics (UT)]]
* [[Legacy:Movement Metrics (UT2003)|Movement metrics (UT2003)]]
* [[Legacy:Movement Metrics (UT2004)|Movement Metrics (UT2004)]]
* [[Legacy:Topics On Mapping|Topics on Mapping]]
* [[Legacy:Topics On Modeling|Topics on Modeling]]

[[Category:Legacy Mapping|{{PAGENAME}}]]
[[Category:Legacy Modeling|{{PAGENAME}}]]
Return to Legacy:Unreal Unit.
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