Python tag refresh editor selection

On 08/10/2014 at 04:19, xxxxxxxx wrote:

Hallo,

in this script ( c4d file https://www.hidrive.strato.com/share/mvm9t4h3vi#$/) i want to deselect a number of selected polygons but the editor is not refreshed.

import c4d
#Welcome to the world of Python

changed=0 # glabal variable

def main() :
    # global changed # must be defined in function as global
    # null=op.GetObject() # object of python tag
    print " "
    obj=doc.GetActiveObject()
    if not (obj==None) :
        print "selected object =",obj.GetName(), obj.GetTypeName()
        if (obj.CheckType(c4d.Opolygon)) :
            n=obj.GetPolygonCount()
            sel=obj.GetPolygonS()
            nsel=sel.GetCount()
            nth=op[c4d.ID_USERDATA,1]
            print "number of selected polygons:",n,nsel,nth
            if (nsel>3) :
                for i in range(0,nsel) :
                    if (i % nth==0) :
                        sel.Deselect(i)
                        print i,"deselected"
                # here i want to refresh the editor
                # c4dtools.utils.update_editor() # nothing happens
                # obj.Message(c4d.MSG_UPDATE) # nothing happens
                # c4d.EventAdd(); # endless loop calling this function
                return

I have googleing one day without any result. Please excuse me its my first posting in forums.

Thanks Udo Welz

On 08/10/2014 at 08:24, xxxxxxxx wrote:

Welcome.

Try it like this:

  
import c4d  
def main() :  
  
  #The object the tag is on  
  obj = op.GetObject()  
  if not obj: return False  
  
  totalpolys = obj.GetPolygonCount()      
  PolyS = obj.GetPolygonS()  
    
  #If the user selects 4 or more polygons  
  #The code below will automatically de-select every other polygon  
  if PolyS.GetCount() > 3:  
    
      #We will De-Select every other polygon  
      #Change this variable. Or use a UserData gizmo to change it  
      nth = 2  
  
      #First this code selects all of the polygons  
      #Then it de-selects every other one  
      for poly in xrange(totalpolys) :  
          PolyS.Select(poly)  
          if poly % nth==0: PolyS.Deselect(poly)

-ScottA

On 09/10/2014 at 04:12, xxxxxxxx wrote:

Thank you ScottA.

It's my first test in programming cinema. My goal is to select a bunch of polygons in editor e.g. like the loop selection on sphere. Then run the script to deselect nth polygon. Then i want to continue modelling with this selection in editor. I thought that sel is an array or so and the loop index e.g. 2 selected the 2.th selected polygon but it's only selecting the 2.th polygon of all polygons wich was not select. Sorry for my english. I am german and speaking or writting is not so good. Your suggestion was very helpful.

Udo

On 09/10/2014 at 05:10, xxxxxxxx wrote:

👍 I've solved this problem by doing this

import c4d
import new
#Welcome to the world of Python

changed=0 # glabal variable

def main() :
    # global changed # must be defined in function as global
    # null=op.GetObject() # object of python tag
    if (op!=doc.GetActiveTag()) : return
    print " "
    obj=doc.GetActiveObject()
    if not (obj==None) :
        print "selected object =",obj.GetName(), obj.GetTypeName()
        if (obj.CheckType(c4d.Opolygon)) :
            n=obj.GetPolygonCount()
            sel=obj.GetPolygonS()
            nsel=sel.GetCount()
            nth=op[c4d.ID_USERDATA,1]
            print "number of selected polygons:",n,nsel,nth
            if (nsel>3) :
                j=0
                for i in xrange(n) :
                    if (sel.IsSelected(i)) :
                        if (j % nth==0) :
                            sel.Toggle(i)
                            print i,"deselected"
                        j+=1

Thank you ScottA for help