Scene Graph Tree selection with Python

Forums Solaris and Karma Scene Graph Tree selection with Python

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erikcarlson: Member; 25 posts; Joined: Dec. 2015; Offline

Jan. 4, 2023 10:07 p.m.

Is it possible to get/set selection for the Scene Graph Tree in Python. I was looking at the docs and could not find anything.

https://www.sidefx.com/docs/houdini/hom/hou/SceneGraphTree.html [www.sidefx.com]


mtucker: Staff; 4565 posts; Joined: July 2005; Offline

Jan. 5, 2023 12:07 a.m.

The scene graph tree shows the selection owned by the LOP Network. You can get or set that selection using hou.LopNetwork methods (selection() and setSelection()).


erikcarlson: Member; 25 posts; Joined: Dec. 2015; Offline

Jan. 5, 2023 1:15 p.m.

Thank you mtucker! That was it. I was looking in the wrong place.


Zhuk Cmon: Member; 3 posts; Joined: March 2015; Offline

April 11, 2023 11:44 a.m.

Hello,
I have a follow up question.
Is there a selection change callback for the custom Panel editors?
Thanks.


mtucker: Staff; 4565 posts; Joined: July 2005; Offline

April 12, 2023 5:16 p.m.

Yep, you can use `hou.node('/stage').addEventCallback(, cb_function)`


Zhuk Cmon: Member; 3 posts; Joined: March 2015; Offline

April 13, 2023 11:40 a.m.

Which event type that would be? I tried SelectionChanged but it's not firing up.


robp_sidefx: Staff; 593 posts; Joined: June 2020; Offline

April 14, 2023 5:06 a.m.

Zhuk Cmon
Which event type that would be? I tried SelectionChanged but it's not firing up.

It should be that. If you paste this in the Python pane and then click in the scenegraph tree you should see messages appearing.

hou.node('/stage').addEventCallback([hou.nodeEventType.SelectionChanged,], lambda node, event_type: print('Selection changed!'))

This of course assumes the lopnet you want to watch is indeed /stageand not, for example, /obj/lopnet1.

Edited by robp_sidefx - April 14, 2023 05:07:43


Zhuk Cmon: Member; 3 posts; Joined: March 2015; Offline

April 14, 2023 7:31 a.m.

Gotcha, yes this works. I was registering callback for particular lop node not network.
Thank you.


jerrykyj.kon: Member; 2 posts; Joined: Oct. 2018; Offline

Nov. 27, 2023 5:03 p.m.

robp_sidefx
Zhuk Cmon
Which event type that would be? I tried SelectionChanged but it's not firing up.

It should be that. If you paste this in the Python pane and then click in the scenegraph tree you should see messages appearing.
hou.node('/stage').addEventCallback([hou.nodeEventType.SelectionChanged,], lambda node, event_type: print('Selection changed!'))
This of course assumes the lopnet you want to watch is indeed /stageand not, for example, /obj/lopnet1.

Hi,How to get the current selected prims in Scenegraphtree pane, why dont Houdini pass the selected prims to kwargs of the callback funtion?

Edited by jerrykyj.kon - Nov. 27, 2023 17:04:36


mtucker: Staff; 4565 posts; Joined: July 2005; Offline

Nov. 27, 2023 11:50 p.m.

We didn't bother to add that to the kwargs directly because it's information that is easy to get from the node:

kwargs['node'].selection()

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