# Axis position

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On 24/03/2012 at 07:16, xxxxxxxx wrote:

Hi all

very simple question, how to change the axis position (using python of course)?
i can't find the Axis Modification command or something similar in the documentation, maybe i need to use matrix for that  ??

an example 'll be very helpful.

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On 24/03/2012 at 10:33, xxxxxxxx wrote:

axis are just a representation of the difference of local and global coordinates. and yes you will have
to use matrices :)

edit :

here is the main entry point to mess with local/global coordinates.

http://www.thirdpartyplugins.com/python/modules/c4d/C4DAtom/GeListNode/BaseList2D/BaseObject/index.html#c4d.BaseObject

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On 24/03/2012 at 11:18, xxxxxxxx wrote:

thank you littledevil for your answer :)
i know that axis are just a representation. to get this, i use usually

``````
obj.GetMg().off
``````

the problem is, if i change these coordinates, the object will move too, and i need to keep the object in the same postion.

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On 24/03/2012 at 14:00, xxxxxxxx wrote:

You can only move the axis for point object.
You first store the original points, move the object, then reset the points
to the original positions.
This command example moves the axis to the parent.

Cheers
Lennart

``````
# Move the axis of a point object and keep points at original local(parent) position

import c4d
from c4d import Vector as v

def main() :
if op is None or not op.CheckType(c4d.Opoint) : return False
oldm   = op.GetMg()
points = op.GetAllPoints()
pcount = op.GetPointCount()

doc.StartUndo()
op.SetAbsRot(v(0))
op.SetAbsPos(v(0))
op.Message(c4d.MSG_UPDATE)

newm    = op.GetMg()

for p in xrange(pcount) :
op.SetPoint(p,~newm*oldm*points[p])

op.Message(c4d.MSG_UPDATE)
doc.EndUndo()

if __name__=='__main__':
main()
``````

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On 25/03/2012 at 06:52, xxxxxxxx wrote:

i got the idea, thank you very much Lennart :)

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On 27/03/2012 at 07:25, xxxxxxxx wrote:

This one demonstrates a little other approach and is about 2 lines shorter than Lennarts version.

``````# coding:      ascii
# file:        <scriptmanager>
# description: Reset an object's position to the origin while its points keep
#              their position globally.

import c4d

def main() :
if not op or not op.CheckType(c4d.Opoint) :
return

mg     = op.GetMg()
pcount = op.GetPointCount()

# tell c4d to encapsulate the following steps into a single
# undo step
doc.StartUndo()

for i in xrange(pcount) :
point = op.GetPoint(i)
op.SetPoint(i, point * mg)

op.SetAbsPos(c4d.Vector(0))
op.SetAbsRot(c4d.Vector(0))
op.Message(c4d.MSG_UPDATE)

# close the undo encapsulation and tell c4d to update the gui
doc.EndUndo()

main()
``````

Cheers!
-Niklas

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On 27/03/2012 at 09:10, xxxxxxxx wrote:

Hi Niklas, put a timer in them and explore:)

Cheers
Lennart

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On 24/10/2012 at 08:01, xxxxxxxx wrote:

Hello ,

I tried to change your script to set the axis to the center of the bounding box with

``````#newm    = op.GetMg()
newm    = op.GetMp()
``````

but i get a float instead of vector error?

Traceback (most recent call last) :
File "'scriptmanager'", line 32, in <module>
File "'scriptmanager'", line 25, in main
TypeError: argument 2 must be c4d.Vector, not float

any ideas ?

kind regards mogh

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On 24/10/2012 at 11:21, xxxxxxxx wrote:

Possibly because GetMg() does not return a matrix, but a *Vector*.
Didn't check it, however.

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On 25/10/2012 at 00:21, xxxxxxxx wrote:

but

``````opt.SetMg(newm)
``````

says it wants a vector ?

argument 2 must be c4d.Vector, not float

anyway how do i get a matrix from a single vector remaining the orientation.

I am sorry, math is not my profession ...

kind regards

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On 29/10/2012 at 01:52, xxxxxxxx wrote:

Code Vonc
has some interesting stuff - still getting nowhere

http://code.vonc.fr/?a=22

kind regards