Geometry unpacked from folder isn't writable? Why?

Forums Rigging Geometry unpacked from folder isn't writable? Why?

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kodra: Member; 373 posts; Joined: June 2023; Offline

Dec. 23, 2023 2:26 a.m.

For example, this Python SOP (assuming Base.skel exists):

geo = node.geometry()

skel = geo.unpackFromFolder("/Base.skel")
skel.addAttrib(hou.attribType.Global, "frame_range", (1, 1))
skel.setGlobalAttribValue("frame_range", (1,120))

results in:

hou.GeometryPermissionError: Geometry is read-only.

It's a bit weird tho... geoitself is writable, why isn't the geometry unpacked from it? What's the correct way to handle it? Just create a new hou.Geometry()then copy()?

Edited by kodra - Dec. 23, 2023 02:29:14


tamte: Member; 9262 posts; Joined: July 2007; Online

Dec. 23, 2023 9:55 a.m.

try doing this:

skel = geo.unpackFromFolder("/Base.skel").freeze()

Tomas Slancik
CG Supervisor
Framestore, NY


edward: Member; 8054 posts; Joined: July 2005; Offline

Jan. 16, 2024 4:13 p.m.

Just to explain, the geometry objects returned by unpackFromFolder() can be a reference to the geometry directly inside the packed primitive for efficiency reasons. So doing "freeze()" gives you a writable copy of the geometry.

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