This class derives from the MSPluginClass which in turn derives from the MAXClass. Custom Attributes are instances of this class.
Properties
<MSCustAttribDef>.ispb2basedRead-only Boolean property. Always returns True since Custom Attributes use ParamBlock2. This property is also available in MAXClass and MSPluginClass.
<MSCustAttribDef>.isMSPluginClassRead-only property of custom attribute definition. Also available in MAXClass, and MSPluginClass. SinceMSPluginClass derives from MAXClass, and MSCustAttribDef derives from MSPluginClass, the property always returns True for custom attribute definitions.
<MSCustAttribDef>.isMSCustAttribClassA read-only property, always true for custom attribute definitions. Also available in MAXClass and MSPluginClass.
<MSCustAttribDef>.versionA read-only property of custom attribute definition. Also available in MSPluginClass. The property contains the version of the custom attribute definitions.
Available in 3ds Max 2015 and higher.
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