"050085 : Non-closed feature ignored in <value>, OID: <value>."
Non-closed features are skipped and not used by set operator tools. For example, the tools found under ArcToolbox > 3D Analyst Tools > 3D Features. The error message shows the input feature class name and the object ID (OID) of the input feature that is not closed.
There is currently no way to close a multipatch using Esri software. This must be done using other 3D editing software. To determine whether or not a feature is closed, run the 'Isclosed' tool in 3D Analyst.
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