@m_magalhaes

Thanks.

Next time I will follow the instruction.
Thanks

I have my user date applied on to the null plus python tag is also sitting on the null.
So I think in def main():
I need to get the tag first and then null in order to read the data from userdata......
That's make sense for me anyway)
Thanks

So Did I missed the actual link to my null object?

Ok I figured it out :)

import c4d
#Welcome to the world of Python

desc_x = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION, c4d.DTYPE_VECTOR, 0),
                    c4d.DescLevel(c4d.VECTOR_X, c4d.DTYPE_REAL, 0))

desc_y = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION,c4d.DTYPE_VECTOR, 0),  
                    c4d.DescLevel(c4d.VECTOR_Y, c4d.DTYPE_REAL, 0))
    
desc_z = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION, c4d.DTYPE_VECTOR, 0),
                    c4d.DescLevel(c4d.VECTOR_Z, c4d.DTYPE_REAL, 0))

def createPositionTracks(object):
    
    trackPosX = object.FindCTrack(desc_x)
    trackPosY = object.FindCTrack(desc_y)
    trackPosZ = object.FindCTrack(desc_z)
    
    
    if trackPosX is None:  
        track = c4d.CTrack(object, desc_x)
        object.InsertTrackSorted(track)
        
    if trackPosY is None:  
        track = c4d.CTrack(object, desc_y)
        object.InsertTrackSorted(track)
        
    
    if trackPosZ is None:
        track = c4d.CTrack(object, desc_z)
        object.InsertTrackSorted(track)
        
def setPositionKey(object, time, pos):
    
    trackPosX = object.FindCTrack(desc_x)
    trackPosY = object.FindCTrack(desc_y)
    trackPosZ = object.FindCTrack(desc_z)
    
    curvePosX = trackPosX.GetCurve()
    curvePosY = trackPosY.GetCurve()
    curvePosZ = trackPosZ.GetCurve()
    
    keydict = curvePosX.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosX,pos.x)
   
    keydict = curvePosY.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosY,pos.y)
   
    keydict = curvePosZ.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosZ,pos.z)
    
    return True
    
def main():
    o = op.GetObject()
    source = o[c4d.ID_USERDATA,1]
    target = o[c4d.ID_USERDATA,2]
    offset = o[c4d.ID_USERDATA,3]
    
    if source is not None and target is not None:
        t = doc.GetTime()
        createPositionTracks(target)
        setPositionKey(target,t,source.GetAbsPos() + offset)
        

when I having target = op[c4d.ID_USERDATA,2] it;s coming with this error : AttributeError: parameter access failed

Hi Zipit,

Thanks for reply. Yes I have made a mistake typing FindTrack(). It should be FindCTrack().
Can you explain what do you mean by some_node?
Thanks again:)

Hi, I am trying to transfer pos of one obj on the other obj but I am getting this error AttributeError: 'list' object has no attribute 'FindTrack'

I am not sure how to sort it out.
Thanks for any help

import c4d
#Welcome to the world of Python

desc_x = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION, c4d.DTYPE_VECTOR, 0),
                    c4d.DescLevel(c4d.VECTOR_X, c4d.DTYPE_REAL, 0))

desc_y = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION,c4d.DTYPE_VECTOR, 0),  
                    c4d.DescLevel(c4d.VECTOR_Y, c4d.DTYPE_REAL, 0))
    
desc_z = c4d.DescID(c4d.DescLevel(c4d.ID_BASEOBJECT_POSITION, c4d.DTYPE_VECTOR, 0),
                    c4d.DescLevel(c4d.VECTOR_Z, c4d.DTYPE_REAL, 0))

def createPositionTracks(object):
    
    trackPosX = object.FindTrack(desc_x)
    trackPosY = object.FindTrack(desc_y)
    trackPosZ = object.FindTrack(desc_z)
    
    
    if trackPosX is None:  
        track = c4d.CTrack(object, desc_x)
        object.InsertTrackSorted(track)
        
    if trackPosY is None:  
        track = c4d.CTrack(object, desc_y)
        object.InsertTrackSorted(track)
        
    
    if trackPosZ is None:
        track = c4d.CTrack(object, desc_z)
        object.InsertTrackSorted(track)
        
def setPositionKey(object, time, pos):
    
    trackPosX = object.FindTrack(desc_x)
    trackPosY = object.FindTrack(desc_y)
    trackPosZ = object.FindTrack(desc_z)
    
    curvePosX = trackPosX.GetCurve()
    curvePosY = trackPosY.GetCurve()
    curvePosZ = trackPosZ.GetCurve()
    
    keydict = curvePosX.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosX,pos.x)
   
    keydict = curvePosY.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosY,pos.y)
   
    keydict = curvePosZ.AddKey(time)
    key = keydict["key"]
    key.SetValue(curvePosZ,pos.z)
    
    return True
    
def main():
    
    source = [c4d.ID_USERDATA,1]
    target = [c4d.ID_USERDATA,2]
    offset = [c4d.ID_USERDATA,3]
    
    if source is not None and target is not None:
        t = doc.GetTime()
        createPositionTracks(target)
        setPositionKey(target,t,source.GetAbsPos() + offset)
        

I thing after short research that c4d.plugins.ObjectData could actually be the solution I am after.
I will be posting my progress here.
Once again Thanks Guys for heads up!!!!!
Thanks

Here I uploaded the effect I am after :

https://vimeo.com/359336806?activityReferer=1

I know that using Boole in C4D I can have exactly the same effect BUT my goal is to start from this simple effect as a python journey.
Thanks for any suggestion.
Thanks

Here is the code I am playing with now

import c4d
from c4d import gui
from c4d import utils

#Welcome to the world of Python


def main():
    
    
    nullObj =  doc.SearchObject("Null")
    polyObj = doc.SearchObject("Sphere")
    
    if nullObj:
        print("Null is")
        
    if not nullObj:
        print("no Null")
        
    if polyObj:
        print("Sphere is")
        
    if not polyObj:
        print("no Sphere")
        
    #get nullObj world space position
    nullWSMg = nullObj.GetMg().off
    print nullWSMg
    
    #get matrix and points from polyObj
    polyObjWSMg = polyObj.GetMg().off
    polyObjPointsPos = polyObj.GetAllPoints()
    #print polyObjPointsPos
    print polyObjWSMg
    
    #point selection of the polygon object
    selection = polyObj.GetPointS()
    selection.DeselectAll()
    
    #check each point
    
    for i, point in enumerate(polyObjPointsPos):
        #get WS pos of the points
        pointPos = polyObjWSMg * point
        
        #get the distance from point to the null
        diff = nullWSMg - pointPos
        distance = diff.GetLength()
        
        #check distance
        if distance < 100:
            selection.Select(i)
            
    #delete selected points
    
    mode = c4d.MODELINGCOMMANDMODE_POINTSELECTION
    res = c4d.utils.SendModelingCommand(c4d.MCOMMAND_DELETE, list = [polyObj], doc = doc, mode = mode)
            
    c4d.EventAdd()
    
        
if __name__=='__main__':
    main()