krueger
This one is cleaned up a little bit, also adding the option to run over every scene view or just the active one. Adding a hotkey for the scene viewer will make it work on whichever scene view your mouse is over too.

def toggleNulls(toggleAllViewers=True):
    import toolutils
    
    # Check to see if the nulls were toggled already.
    if "nullsVisible" in dir(hou.session) :
        visible = hou.session.nullsVisible
    else :
        visible = True
        hou.session.nullsVisible = visible
    
    try :
        desktop = hou.ui.curDesktop().name()
        pane = toolutils.activePane(kwargs).name()
        views = hou.hscript("viewls -n")[0].split("\n")
        if visible :
            toggle = "-"
        else :
            toggle = "+"
        
        # Toggle viewers
        if toggleAllViewers :
            for view in views :
                hou.hscript( "vieweroption -V '%snull' '%s'" % (toggle, view) )
        else :
            # Find the viewer name for hscript.
            for view in views :
                if (desktop in view) and (".%s." % (pane) in view) :
                    hou.hscript( "vieweroption -V '%snull' '%s'" % (toggle, view) )
                
        # Change the stored variable.
        hou.session.nullsVisible = not visible
    except :
        print "No scene view open."

# Toggle current viewer
toggleNulls(toggleAllViewers=False)

# Toggle all viewers
#toggleNulls()

Hey Krueger,

would you be so kind to update your script to Houdini 19? It's not working for me. maybe because of PY3?

Thank you!
Cheers
CYTE

This should work:

Thank You, much appreciated!

me and my animation team would love to be able to do this with polygons! can i simply replace the nulls flag with something else to make this work? i am pretty limited in my houdini and python knowledge here..... as far as i can tell it may not be polygons in houdini but "characters" ...so sorry for the dumb question

pbinga
me and my animation team would love to be able to do this with polygons! can i simply replace the nulls flag with something else to make this work? i am pretty limited in my houdini and python knowledge here..... as far as i can tell it may not be polygons in houdini but "characters" ...so sorry for the dumb question

Hey, can you explain more what you're trying to toggle? It's been a few years, but this is using the hscript command vieweroption so these are the options:

-V ‹visibilitystring›

Set object level visibility by supplying a space separated string of tokens. Each token takes the form '+‹type›' or '-‹type›' where type is one of: *, geo, cam, light, muscle, bone, null, blend, other, or popguide.

https://www.sidefx.com/docs/houdini/commands/vieweroption.html [www.sidefx.com]

were using the apex animate stage in houdini 20.5 and wanting to be able to globally toggle the char vis of all characters on and off with a hotkey rather than per selection set.

I haven't used apex before, but you can try using the script above but just change the 2 lines that actually specify the "null" to use "geo". So these 2 lines:

would become: