Difference between revisions of "IC Python API:RLPy RTransform"
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== Description == | == Description == | ||
| − | This class represent the object transform data. This class provides access to RLPy's internal 4x4 matrix operators and related functions. | + | This class represent the object transform matrix data. This class provides access to RLPy's internal 4x4 matrix operators and related functions. |
See also: [[IC_Python_API:RLPy_RMatrix4|RMatrix4]] | See also: [[IC_Python_API:RLPy_RMatrix4|RMatrix4]] | ||
| Line 17: | Line 17: | ||
See Also: [[#+=|+=]] | See Also: [[#+=|+=]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix_a = RLPy.RMatrix4( 2, 0, 0, 0, | matrix_a = RLPy.RMatrix4( 2, 0, 0, 0, | ||
0, 2, 0, 0, | 0, 2, 0, 0, | ||
| Line 42: | Line 42: | ||
See Also: [[#!=|!=]] | See Also: [[#!=|!=]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | ||
print( transform_identity == transform_identity ) # true | print( transform_identity == transform_identity ) # true | ||
| Line 53: | Line 53: | ||
See Also: [[#==|==]] | See Also: [[#==|==]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | ||
print( transform_identity != transform_identity ) # false | print( transform_identity != transform_identity ) # false | ||
| Line 64: | Line 64: | ||
See Also: [[#+|+]] | See Also: [[#+|+]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix_a = RLPy.RMatrix4( 2, 0, 0, 0, | matrix_a = RLPy.RMatrix4( 2, 0, 0, 0, | ||
0, 2, 0, 0, | 0, 2, 0, 0, | ||
| Line 88: | Line 88: | ||
=== D (self, args) === | === D (self, args) === | ||
| − | Get the determinate sign. | + | Get the determinate sign of this transform matrix. |
==== Returns ==== | ==== Returns ==== | ||
:Returns the value of determinate sign - float | :Returns the value of determinate sign - float | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY) | ||
print(transform_identity.D()) # <Swig Object of type 'float *' at 0x0000027B8A2D1FC0> | print(transform_identity.D()) # <Swig Object of type 'float *' at 0x0000027B8A2D1FC0> | ||
| Line 100: | Line 100: | ||
=== S (self, args) === | === S (self, args) === | ||
| − | Get the Scale of | + | Get the Scale of this transform matrix. |
==== Returns ==== | ==== Returns ==== | ||
:The value of scale in 3D vector - [[IC_Python_API:RLPy_RVector3|RVector3]] | :The value of scale in 3D vector - [[IC_Python_API:RLPy_RVector3|RVector3]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
d_determinate = 0 | d_determinate = 0 | ||
s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | ||
| Line 124: | Line 124: | ||
=== U (self, args) === | === U (self, args) === | ||
| − | Get the stretch of | + | Get the stretch of this transform matrix. |
==== Returns ==== | ==== Returns ==== | ||
:The value of stretch in quaternion - [[IC_Python_API:RLPy_RQuaternion|RQuaternion]] | :The value of stretch in quaternion - [[IC_Python_API:RLPy_RQuaternion|RQuaternion]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
d_determinate = 0 | d_determinate = 0 | ||
s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | ||
| Line 150: | Line 150: | ||
=== R (self, args) === | === R (self, args) === | ||
| − | Get the rotation of | + | Get the rotation of this transform matrix. |
==== Returns ==== | ==== Returns ==== | ||
:The value of rotation in quaternion - [[IC_Python_API:RLPy_RQuaternion|RQuaternion]] | :The value of rotation in quaternion - [[IC_Python_API:RLPy_RQuaternion|RQuaternion]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
d_determinate = 0 | d_determinate = 0 | ||
s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | ||
| Line 176: | Line 176: | ||
=== T (self, args) === | === T (self, args) === | ||
| − | Get the translation of | + | Get the translation of this transform matrix. |
==== Returns ==== | ==== Returns ==== | ||
:The value of translation in 3D vector - [[IC_Python_API:RLPy_RVector3|RVector3]]. | :The value of translation in 3D vector - [[IC_Python_API:RLPy_RVector3|RVector3]]. | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
d_determinate = 0 | d_determinate = 0 | ||
s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | s_scale = RLPy.RVector3( RLPy.RVector3.ZERO ) | ||
| Line 200: | Line 200: | ||
=== AlmostEquel (self, kRts) === | === AlmostEquel (self, kRts) === | ||
| − | + | Check if this and another transform is almost equal. | |
==== Parameters ==== | ==== Parameters ==== | ||
| Line 206: | Line 206: | ||
==== Returns ==== | ==== Returns ==== | ||
| − | : | + | :'''True''' if this and another transform is almost equal, else '''False''' - bool |
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | ||
0,-1, 0, 0, | 0,-1, 0, 0, | ||
| Line 222: | Line 222: | ||
=== Inverse (self) === | === Inverse (self) === | ||
| − | + | Get the inverse of this transform. | |
==== Returns ==== | ==== Returns ==== | ||
| − | : | + | :The inverse of this transform - [[IC_Python_API:RLPy_RTransform|RTransform]] |
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | ||
0,-1, 0, 0, | 0,-1, 0, 0, | ||
| Line 240: | Line 240: | ||
=== From (self, mMatrix) === | === From (self, mMatrix) === | ||
| − | Set | + | Set this transform from a 4x4 matrix. |
==== Returns ==== | ==== Returns ==== | ||
:A transform composited from 4x4 matrix - [[IC_Python_API:RLPy_RTransform|RTransform]] | :A transform composited from 4x4 matrix - [[IC_Python_API:RLPy_RTransform|RTransform]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | matrix4 = RLPy.RMatrix4(-1, 0, 0, 0, | ||
0,-1, 0, 0, | 0,-1, 0, 0, | ||
| Line 258: | Line 258: | ||
=== Matrix (self) === | === Matrix (self) === | ||
| − | Get 4x4 matrix from | + | Get 4x4 matrix from this transform. |
==== Returns ==== | ==== Returns ==== | ||
:A 4x4 matrix - [[IC_Python_API:RLPy_RMatrix4|RMatrix4]] | :A 4x4 matrix - [[IC_Python_API:RLPy_RMatrix4|RMatrix4]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix4 = RLPy.RMatrix4( 0,-1, 0, 0, | matrix4 = RLPy.RMatrix4( 0,-1, 0, 0, | ||
-1, 0, 0, 0, | -1, 0, 0, 0, | ||
| Line 277: | Line 277: | ||
=== IsIdentity (self) === | === IsIdentity (self) === | ||
| − | Check if this transform is identity. | + | Check if this transform is equal to identity transform. Identity transform corresponds to "no transform" - the object is perfectly aligned with the world or parent axes and positioned at the origin. |
==== Returns ==== | ==== Returns ==== | ||
| − | :True if the transform is identity - bool | + | :'''True''' if the transform is equal to identity transform, else '''False''' - bool |
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
matrix4 = RLPy.RMatrix4( 1, 0, 0, 0, | matrix4 = RLPy.RMatrix4( 1, 0, 0, 0, | ||
0, 1, 0, 0, | 0, 1, 0, 0, | ||
| Line 293: | Line 293: | ||
=== Scale (self) === | === Scale (self) === | ||
| − | Form a scale matrix | + | Form a scale matrix from this transform. |
==== Returns ==== | ==== Returns ==== | ||
:A 3x3 scale matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | :A 3x3 scale matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
scale = RLPy.RVector3( 4, 5, 6 ) | scale = RLPy.RVector3( 4, 5, 6 ) | ||
matrix4 = RLPy.RMatrix4().FromRTS( RLPy.RMatrix3.IDENTITY, | matrix4 = RLPy.RMatrix4().FromRTS( RLPy.RMatrix3.IDENTITY, | ||
| Line 312: | Line 312: | ||
=== Rotate (self) === | === Rotate (self) === | ||
| − | Form a rotate matrix. | + | Form a rotate matrix from this transform. |
==== Returns ==== | ==== Returns ==== | ||
:A 3x3 rotate matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | :A 3x3 rotate matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
rotate = RLPy.RMatrix3( 0.8137977, -0.4698463, 0.3420202, | rotate = RLPy.RMatrix3( 0.8137977, -0.4698463, 0.3420202, | ||
0.5438381, 0.8231729, -0.1631759, | 0.5438381, 0.8231729, -0.1631759, | ||
-0.2048741, 0.3187958, 0.9254166 ) | -0.2048741, 0.3187958, 0.9254166 ) | ||
| − | matrix4 = RLPy.RMatrix4().FromRTS( | + | matrix4 = RLPy.RMatrix4().FromRTS( [[#Rotate (self)|Rotate]], RLPy.RVector3.UNIT_XYZ , RLPy.RVector3.UNIT_XYZ ) |
transform_data = RLPy.RTransform().From( matrix4 ) | transform_data = RLPy.RTransform().From( matrix4 ) | ||
| Line 331: | Line 331: | ||
=== GetSR (self) === | === GetSR (self) === | ||
| − | Form a 3x3 matrix with rotation and scale. | + | Form a 3x3 matrix with rotation and scale from this transform. |
==== Returns ==== | ==== Returns ==== | ||
:A 3x3 matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | :A 3x3 matrix from this transform - [[IC_Python_API:RLPy_RMatrix3|RMatrix3]] | ||
| − | <syntaxhighlight lang="python"> | + | <syntaxhighlight lang="python" line='line'> |
scale = RLPy.RVector3( 2, 2, 2 ) | scale = RLPy.RVector3( 2, 2, 2 ) | ||
rotate = RLPy.RMatrix3( -0,-0, 1, | rotate = RLPy.RMatrix3( -0,-0, 1, | ||
-1,-0, 0, | -1,-0, 0, | ||
0,-1,-0 ) | 0,-1,-0 ) | ||
| − | matrix4 = RLPy.RMatrix4().FromRTS( | + | matrix4 = RLPy.RMatrix4().FromRTS( [[#Rotate (self)|Rotate]], RLPy.RVector3.UNIT_XYZ , scale ) |
transform_data = RLPy.RTransform().From( matrix4 ) | transform_data = RLPy.RTransform().From( matrix4 ) | ||
Latest revision as of 19:31, 13 April 2020
Contents
- 1 Description
- 2 Operators
- 3 Member Functions
- Main article: Modules.
- Last modified: 04/13/2020
Description
This class represent the object transform matrix data. This class provides access to RLPy's internal 4x4 matrix operators and related functions.
See also: RMatrix4
Operators
+
The "addition" operator.
See Also: +=
1 matrix_a = RLPy.RMatrix4( 2, 0, 0, 0,
2 0, 2, 0, 0,
3 0, 0, 2, 0,
4 1, 2, 3, 1 )
5 matrix_b = RLPy.RMatrix4( 3, 0, 0, 0,
6 0, 3, 0, 0,
7 0, 0, 3, 0,
8 2, 2, 2, 1 )
9 transform = RLPy.RTransform().From( matrix_a ) + RLPy.RTransform().From( matrix_b )
10
11 print( transform.Matrix().GetRow(0)[0] == 2*3 ) # true
12 print( transform.Matrix().GetRow(1)[1] == 2*3 ) # true
13 print( transform.Matrix().GetRow(2)[2] == 2*3 ) # true
14 print( transform.Matrix().GetRow(3)[0] == 1+2 ) # true
15 print( transform.Matrix().GetRow(3)[1] == 2+2 ) # true
16 print( transform.Matrix().GetRow(3)[2] == 3+2 ) # true
==
The "equal to" operator.
See Also: !=
1 transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY)
2 print( transform_identity == transform_identity ) # true
!=
The "not equal to" operator.
See Also: ==
1 transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY)
2 print( transform_identity != transform_identity ) # false
+=
The "addition assignment" operator.
See Also: +
1 matrix_a = RLPy.RMatrix4( 2, 0, 0, 0,
2 0, 2, 0, 0,
3 0, 0, 2, 0,
4 1, 2, 3, 1 )
5 matrix_b = RLPy.RMatrix4( 3, 0, 0, 0,
6 0, 3, 0, 0,
7 0, 0, 3, 0,
8 2, 2, 2, 1 )
9 transform = RLPy.RTransform().From( matrix_a )
10 transform += RLPy.RTransform().From( matrix_b )
11
12 print( transform.Matrix().GetRow(0)[0] == 2*3 ) # true
13 print( transform.Matrix().GetRow(1)[1] == 2*3 ) # true
14 print( transform.Matrix().GetRow(2)[2] == 2*3 ) # true
15 print( transform.Matrix().GetRow(3)[0] == 1+2 ) # true
16 print( transform.Matrix().GetRow(3)[1] == 2+2 ) # true
17 print( transform.Matrix().GetRow(3)[2] == 3+2 ) # true
Member Functions
D (self, args)
Get the determinate sign of this transform matrix.
Returns
- Returns the value of determinate sign - float
1 transform_identity = RLPy.RTransform(RLPy.RTransform.IDENTITY)
2 print(transform_identity.D()) # <Swig Object of type 'float *' at 0x0000027B8A2D1FC0>
S (self, args)
Get the Scale of this transform matrix.
Returns
- The value of scale in 3D vector - RVector3
1 d_determinate = 0
2 s_scale = RLPy.RVector3( RLPy.RVector3.ZERO )
3 u_stretch = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
4 r_rotate = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
5 t_translate = RLPy.RVector3( RLPy.RVector3.ZERO )
6
7 s_scale.x = 1
8 s_scale.y = 2
9 s_scale.z = 3
10 transform_data = RLPy.RTransform(d_determinate,s_scale,u_stretch,r_rotate,t_translate )
11
12 print( transform_data.S().x ) # 1
13 print( transform_data.S().y ) # 2
14 print( transform_data.S().z ) # 3
U (self, args)
Get the stretch of this transform matrix.
Returns
- The value of stretch in quaternion - RQuaternion
1 d_determinate = 0
2 s_scale = RLPy.RVector3( RLPy.RVector3.ZERO )
3 u_stretch = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
4 r_rotate = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
5 t_translate = RLPy.RVector3( RLPy.RVector3.ZERO )
6
7 u_stretch.x = 4
8 u_stretch.y = 5
9 u_stretch.z = 6
10 u_stretch.w = 7
11 transform_data = RLPy.RTransform(d_determinate,s_scale,u_stretch,r_rotate,t_translate )
12
13 print( transform_data.U().x ) # 4
14 print( transform_data.U().y ) # 5
15 print( transform_data.U().z ) # 6
16 print( transform_data.U().w ) # 7
R (self, args)
Get the rotation of this transform matrix.
Returns
- The value of rotation in quaternion - RQuaternion
1 d_determinate = 0
2 s_scale = RLPy.RVector3( RLPy.RVector3.ZERO )
3 u_stretch = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
4 r_rotate = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
5 t_translate = RLPy.RVector3( RLPy.RVector3.ZERO )
6
7 r_rotate.x = 8
8 r_rotate.y = 9
9 r_rotate.z = 10
10 r_rotate.w = 11
11 transform_data = RLPy.RTransform(d_determinate,s_scale,u_stretch,r_rotate,t_translate )
12
13 print( transform_data.R().x ) # 8
14 print( transform_data.R().y ) # 9
15 print( transform_data.R().z ) # 10
16 print( transform_data.R().w ) # 11
T (self, args)
Get the translation of this transform matrix.
Returns
- The value of translation in 3D vector - RVector3.
1 d_determinate = 0
2 s_scale = RLPy.RVector3( RLPy.RVector3.ZERO )
3 u_stretch = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
4 r_rotate = RLPy.RQuaternion( RLPy.RQuaternion.IDENTITY )
5 t_translate = RLPy.RVector3( RLPy.RVector3.ZERO )
6
7 t_translate.x = 12
8 t_translate.y = 13
9 t_translate.z = 14
10 transform_data = RLPy.RTransform(d_determinate,s_scale,u_stretch,r_rotate,t_translate )
11
12 print( transform_data.T().x ) # 12
13 print( transform_data.T().y ) # 13
14 print( transform_data.T().z ) # 14
AlmostEquel (self, kRts)
Check if this and another transform is almost equal.
Parameters
- kRts [IN] The transform - RTransform
Returns
- True if this and another transform is almost equal, else False - bool
1 matrix4 = RLPy.RMatrix4(-1, 0, 0, 0,
2 0,-1, 0, 0,
3 0, 0, 1, 0,
4 -1, 1, 1, 1 )
5
6 transform1 = RLPy.RTransform().From( matrix4 )
7 transform2 = RLPy.RTransform().From( matrix4 )
8
9 print( transform1.AlmostEquel( transform2 )) # True
Inverse (self)
Get the inverse of this transform.
Returns
- The inverse of this transform - RTransform
1 matrix4 = RLPy.RMatrix4(-1, 0, 0, 0,
2 0,-1, 0, 0,
3 0, 0, 1, 0,
4 -1, 1, 1, 1 )
5
6 transform = RLPy.RTransform().From( matrix4 )
7 print( transform.Matrix().GetRow(0)[0] )
8 print( transform.Matrix().GetRow(0)[1] )
From (self, mMatrix)
Set this transform from a 4x4 matrix.
Returns
- A transform composited from 4x4 matrix - RTransform
1 matrix4 = RLPy.RMatrix4(-1, 0, 0, 0,
2 0,-1, 0, 0,
3 0, 0, 1, 0,
4 -1, 1, 1, 1 )
5 transform = RLPy.RTransform().From( matrix4 )
6
7 print( transform.Matrix().GetRow(0)[0] )
8 print( transform.Matrix().GetRow(0)[1] )
Matrix (self)
Get 4x4 matrix from this transform.
Returns
- A 4x4 matrix - RMatrix4
1 matrix4 = RLPy.RMatrix4( 0,-1, 0, 0,
2 -1, 0, 0, 0,
3 0, 0,-1, 0,
4 1,-2, 1, 1 )
5 transform_data = RLPy.RTransform().From( matrix4 )
6 transform_data_matrix = transform_data.Matrix()
7
8 print( transform_data_matrix.GetRow(0)[0] )
9 print( transform_data_matrix.GetRow(0)[1] )
IsIdentity (self)
Check if this transform is equal to identity transform. Identity transform corresponds to "no transform" - the object is perfectly aligned with the world or parent axes and positioned at the origin.
Returns
- True if the transform is equal to identity transform, else False - bool
1 matrix4 = RLPy.RMatrix4( 1, 0, 0, 0,
2 0, 1, 0, 0,
3 0, 0, 1, 0,
4 0, 0, 0, 1 )
5 transform_data = RLPy.RTransform().From( matrix4 )
6 print( transform_data.IsIdentity() ) # True
Scale (self)
Form a scale matrix from this transform.
Returns
- A 3x3 scale matrix from this transform - RMatrix3
1 scale = RLPy.RVector3( 4, 5, 6 )
2 matrix4 = RLPy.RMatrix4().FromRTS( RLPy.RMatrix3.IDENTITY,
3 RLPy.RVector3.UNIT_XYZ,
4 scale )
5 transform_data = RLPy.RTransform().From( matrix4 )
6
7 print( transform_data.Scale().GetRow(0)[0] ) # 4
8 print( transform_data.Scale().GetRow(1)[1] ) # 5
9 print( transform_data.Scale().GetRow(2)[2] ) # 6
Rotate (self)
Form a rotate matrix from this transform.
Returns
- A 3x3 rotate matrix from this transform - RMatrix3
1 rotate = RLPy.RMatrix3( 0.8137977, -0.4698463, 0.3420202,
2 0.5438381, 0.8231729, -0.1631759,
3 -0.2048741, 0.3187958, 0.9254166 )
4 matrix4 = RLPy.RMatrix4().FromRTS( [[#Rotate (self)|Rotate]], RLPy.RVector3.UNIT_XYZ , RLPy.RVector3.UNIT_XYZ )
5 transform_data = RLPy.RTransform().From( matrix4 )
6
7 print( transform_data.Rotate().GetRow(0)[0] )
8 print( transform_data.Rotate().GetRow(0)[1] )
9 print( transform_data.Rotate().GetRow(0)[2] )
GetSR (self)
Form a 3x3 matrix with rotation and scale from this transform.
Returns
- A 3x3 matrix from this transform - RMatrix3
1 scale = RLPy.RVector3( 2, 2, 2 )
2 rotate = RLPy.RMatrix3( -0,-0, 1,
3 -1,-0, 0,
4 0,-1,-0 )
5 matrix4 = RLPy.RMatrix4().FromRTS( [[#Rotate (self)|Rotate]], RLPy.RVector3.UNIT_XYZ , scale )
6 transform_data = RLPy.RTransform().From( matrix4 )
7
8 print( transform_data.GetSR().GetRow(0)[0] ) # -0*2 = 0
9 print( transform_data.GetSR().GetRow(0)[1] ) # -0*2 = 0
10 print( transform_data.GetSR().GetRow(0)[2] ) # 1*2 = 2
