dskeith last edited by
I'm trying to work with doc.StartPickSession(callback, multi) and I'm running into some questions.
Trying this simple code...
import c4d from c4d import gui def OnPick(active, multi): print "active: ", active print "multi: ", multi # Main function def main(): doc.StartPickSession(OnPick, multi=True) # Execute main() if __name__=='__main__': main()
I'm able to start a multi-object pick session, but once I double-click to complete it, I get this error:
TypeError: OnPick() takes exactly 2 arguments (3 given)
After a bit of detective work, it seems that adding a
mysteryvariable to my callback function
def OnPick(mystery, active, multi):fixes the error. When I run this:
import c4d from c4d import gui def OnPick(mystery, active, multi): print "mystery: ", mystery print "active: ", active print "multi: ", multi # Main function def main(): doc.StartPickSession(OnPick, multi=True) # Execute main() if __name__=='__main__': main()
I get this console output:
mystery: 0 active: [<c4d.BaseObject object called 'Cube/Cube' with ID 5159 at 0x00000290184D2B90>, <c4d.BaseObject object called 'Cube.1/Cube' with ID 5159 at 0x00000290184D2130>, <c4d.BaseObject object called 'Cube.2/Cube' with ID 5159 at 0x00000290184D2170>] multi: True
After a bit more detective work, it seems that
0if I complete the pick-session by double-clicking, and it's
1if I press
Escto finish the pick session.
- What is the
mysteryvariable, and what is it actually returning.
- Is there a way to trigger a multi-pick session where the user doesn't have to hold down shift/ctrl to select multiple elements?
- I'm noticing some weirdness in terms of which objects are selected in the Editor/Viewport after a pick session (especially if I end it by pressing
Esc). What messages/redraws do I need to call after a pick session? Do I need to handle undo or will C4D?
- What is the
m_adam last edited by
Hi, Donovan thanks for reaching us.
mysteryvariable is actually an int flag to retrieve if the user cancels the PickSession or not.
def OnPick(flags, active, multi): if flags & c4d.PICKSESSION_FLAG_CANCELED: print "User cancel" print "active: ", active print "multi: ", multi def main(): doc.StartPickSession(OnPick, multi=True)
- No there is no way.
- Actually nothing, it's up to you to detect when the user cancels with PICKSESSION_FLAG_CANCELED and do whatever you want. Cinema 4D handle automatically undo. But you can call BaseDocument.GetSelection before and BaseDocument.SetSelection after if the user cancels the pick session)
Finally, note the C++ version offer to adds userdata ( For more information please read the C++ documentation https://developers.maxon.net/docs/Cinema4DCPPSDK/html/struct_pick_session_data_struct.html)
If you have any question, please let me know.