[Sidefx-houdini-list] HOM changing geometry selection

Tom Nixon ignivomous at gmail.com
Thu Jul 27 13:57:15 EDT 2017


Hi Chris,

Thanks for the suggestion. I'm
afraid toolutils.sceneViewer().selectGeometry() doesn't seem to have a way
to skip the prompt, and I haven't found a way to give it an arbitrary
initial selection.

Cheers

On Thu, Jul 27, 2017 at 7:14 AM, Chris Rydalch <crydalch at gmail.com> wrote:

> Not sure if this is helpful, but toolutils has a way to prompt for geometry
> selection in the viewport:
>
> >>> import toolutils
> >>> toolutils.sceneViewer().selectGeometry()
>
> The selectGeometry() method has some arguments for what type of geometry to
> select.
>
> On Thu, Jul 27, 2017 at 3:44 AM, Andy Nicholas <andy at andynicholas.com>
> wrote:
>
> > Hi Tom,
> > I’ve got half an answer for you. If you create a string parm on some node
> > and fill it with point IDs, you can use the following python code to load
> > it as a selection in the current viewer, edit it, and set it back to the
> > original parameter. It basically works a bit like the “re-pick” button
> for
> > group parameters.
> >
> > # Set these up to point at your node and string parameter name
> > this_node = hou.node('/obj/geo1/subnet1')
> > parm_name = "point_group_str"
> >
> > kwargs={}
> > kwargs["node"] = this_node
> > kwargs["parmtuple"] = n.parmTuple(parm_name)         # The name of the
> > parameter to read/write
> > kwargs["geometrytype"] = hou.geometryType.Points    # The geometry type
> of
> > the ids in the parameter
> > kwargs["inputindex"] = 0                                                #
> > The input index of the node
> > soputils.selectGroupParm(kwargs)
> >
> > So the code you need is all in the soputils.selectGroupParm() function.
> > That’s why I’m saying this reply is only half an answer, as you’ll need
> to
> > copy that function and reduce it down to the fundamental functionality
> that
> > you need. The important call is to “selectGeometry()" at line 300. It’s
> > undocumented and I’ve not had time to figure out the exact parameter
> values
> > you need to pass it to get what you’re after, but I’m fairly sure you
> > should be able to get what you need.
> >
> > Hope that helps,
> > Andy
> >
> >
> > > On 27 Jul 2017, at 00:20, Tom Nixon <ignivomous at gmail.com> wrote:
> > >
> > > Thanks Andy,
> > >
> > > I would like to be able to provide a list of points/prims or their
> > numbers
> > > and have that change the selection in the viewport (feature request
> made
> > > for a tool I have).
> > >
> > > Seems the tools stop short of that ability - unless I'm missing
> something
> > > staring me in the face!
> > >
> > > Cheers
> > >
> > > On Wed, Jul 26, 2017 at 11:24 AM, Andy Nicholas <andy at andynicholas.com
> >
> > > wrote:
> > >
> > >> Check out the second paragraph on this page. I think it explains what
> > >> you’re after:
> > >>
> > >> www.sidefx.com/docs/houdini/hom/hou/Selection
> > >>
> > >> Note that you have the constructor functions for hou.Selection where
> you
> > >> can create your own selection object and specify the points,
> primitives,
> > >> etc.
> > >>
> > >> Cheers,
> > >> Andy
> > >>
> > >>
> > >>> On 26 Jul 2017, at 18:49, Tom Nixon <ignivomous at gmail.com> wrote:
> > >>>
> > >>> Sorry, by change, I mean to set explicitly (not grow or shrink an
> > >> existing
> > >>> selection).
> > >>>
> > >>> On Wed, Jul 26, 2017 at 10:42 AM, Tom Nixon <ignivomous at gmail.com>
> > >> wrote:
> > >>>
> > >>>> Hey all,
> > >>>>
> > >>>> I'm just hoping there is now some way to change the geometry
> selection
> > >>>> through HOM. I've come up short in the past, but maybe someone out
> > there
> > >>>> has come across a way to do it?
> > >>>>
> > >>>> Thanks,
> > >>>> Tom
> > >>>>
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