Forums Technical Discussion Editing Individual Polygons in Alembic?

Editing Individual Polygons in Alembic?

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CatNamedDinnerplate
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I know you can edit objects as whole in an alembic, but can you edit polygons individually? thanks.
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chrism
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Somehow you managed to post that four times in a row.
Chris McSpurren
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CatNamedDinnerplate
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Whoops! It's not showing up for me, how do I delete them?

Sorry!
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vusta
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unpack first ?
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markinglevfx
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Unpack node, followed by a convert node
Freelance Houdini FX TD

New York

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CatNamedDinnerplate
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I unpacked and converted the geo but when I try to “blast” or create groups houdini tells me that I can't because I'm trying to access an object that is no longer in houdini.
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jsmack
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That's a python error, meaning the node was deleted before a command referencing the node was executed. Where are you seeing this error? If you create a group or blast sop after the convert sop, what happens when you use the reselect button (cursor icon) on the parameter interface?
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CatNamedDinnerplate
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I am seeing the error inside the alembic geo. I can create a blast that deletes everything. the problem is if I try to do anything with the polygons it gives me that error.
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CatNamedDinnerplate
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CatNamedDinnerplate
I am seeing the error inside the alembic geo. I can create a blast that deletes everything. the problem is if I try to do anything with the polygons it gives me that error.

this is details of the error:


Traceback (most recent call last):
File “generic_delete”, line 39, in <module>
File “C: /PROGRA~1/SIDEEF~1/HOUDIN~1.600/houdini/python2.7libs\toolutils.py”, line 1251, in new_func
return function(*args, **kwargs)
File “C: /PROGRA~1/SIDEEF~1/HOUDIN~1.600/houdini/python2.7libs\soptoolutils.py”, line 755, in genericTool
exact_node_type = exact_node_type)
File “C: /PROGRA~1/SIDEEF~1/HOUDIN~1.600/houdini/python2.7libs\soptoolutils.py”, line 497, in genericSopNodeFilterTool
allow_obj_sel)
File “C: /PROGRA~1/SIDEEF~1/HOUDIN~1.600/houdini/python2.7libs\soptoolutils.py”, line 156, in getGeometrySelections
if selector.inputRequired() and len(selection.nodes()) == 0:
File “C: /PROGRA~1/SIDEEF~1/HOUDIN~1.600/houdini/python2.7libs\hou.py”, line 24453, in nodes
return _hou.GeometrySelection_nodes(*args)
ObjectWasDeleted: Attempt to access an object that no longer exists in Houdini.
Edited by CatNamedDinnerplate - Dec. 5, 2017 17:42:15
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jsmack
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I'm not able to recreate your problem, can you post steps or a video showing how you get to that error?

Attachments:
alembic_editing.mp4 (2.2 MB)

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CatNamedDinnerplate
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So I've been doing the exact same thing with my alembic as you did in your video. ( This is imported from maya, so could that be causing issues? ) But I've attached images and my steps were as follows:

AlembicError1.png: imported alembic into fresh scene.

AlembicError2.png: found the specific piece I wanted to edit (in this case it's the only thing in the alembic).

AlembicError3.png: Inside the geo node is the alembic file node.

AlembicError4.png: I added an unpack node.

AlembicError5.png: I added a convert node. ( I checked polygon on the information and it's saying that I should have all of the polygons for this geo 1,000+).

AlembicError6.png: I select the polygons I want to delete.

AlembicError7.png: When I press “Delete” on my keyboard I get the error.

Attachments:
AlembicError1.PNG (424.1 KB)
AlembicError2.PNG (427.2 KB)
AlembicError3.PNG (518.9 KB)
AlembicError4.PNG (97.3 KB)
AlembicError5.PNG (94.3 KB)
AlembicError6.PNG (431.0 KB)
AlembicError7.PNG (264.3 KB)

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CatNamedDinnerplate
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So I just tested it out with an alembic that is native to houdini and it works! So it is a Maya setting… any idea as to what it would be?

Thanks for your help.
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vusta
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I posted solution here:

http://forums.odforce.net/topic/32133-deleting-editing-alembic-geo/ [forums.odforce.net]
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jsmack
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Oh, you have the colons in your node names. There was a recent version of Houdini that made them properly forbidden, since they tend to break everything that references a node by path.

Edit:
changelog:
https://www.sidefx.com/changelog/Main/?journal=&categories=&body=node+name&version=16.5.295&build_0=&build_1=&show_versions=on&show_compatibility=on&items_per_page= [www.sidefx.com]
Edited by jsmack - Dec. 6, 2017 13:18:20
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CatNamedDinnerplate
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jsmack
Oh, you have the colons in your node names. There was a recent version of Houdini that made them properly forbidden, since they tend to break everything that references a node by path.

Edit:
changelog:
https://www.sidefx.com/changelog/Main/?journal=&categories=&body=node+name&version=16.5.295&build_0=&build_1=&show_versions=on&show_compatibility=on&items_per_page= [www.sidefx.com]

This fixed it!

Thank you and thanks for everyone for helping.
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