Hey @mocoloco,

thank you for your answer.

I was asking this because I want to reset some globals var when the TAG is removed - maybe there is a more elegant way to do, but until now I haven't found one yet.

I am not 100% sure, but your answer somewhat implies a misconception about the lifetime of plugin hooks. They are just as volatile as nodes. When we update our code like this:

@staticmethod def GetIdNodeString(node: c4d.GeListNode, hook: object) -> str: """Returns the memory location and MAXON_CREATOR_ID UUID of the node as a string. """ nodeMem: str = str(hex(id(node))).upper() hookMem: str = str(hex(id(hook))).upper() uuid: str = str(DynamicDescriptionTagData.GetNodeUuid(node)) return f"node-mem: {nodeMem}, hook-mem: {hookMem}, node-uuid: {uuid}" def Init(self, node: c4d.GeListNode) -> bool: """Called by Cinema 4D to initialize a tag instance. Args: node: The BaseTag instance representing this plugin object. """ print (f"Init: {DynamicDescriptionTagData.GetIdNodeString(node, self)}")

Which yield data similar to this:

# A call for the actual tag node to be added to the scene graph. """Init: node-mem: 0X25D5E702F40, hook-mem: 0X25DE98A2A90, node-uuid: b',\xf0]w\xccG\x17\x01\x1c|9C\xbc!\x00\x00'""" # ... # A call for the actual tag node to be added to the scene graph. Note that the call it NOT made to # the same plugin hook instance: # # 1: node-mem: 0X25D5E702F40, hook-mem: 0X25DE98A2A90, # node-uuid: b',\xf0]w\xccG\x17\x01\x1c|9C\xbc!\x00\x00' # 2: node-mem: 0X25D5E71A980, hook-mem: 0X25DE989A090, # node-uuid: b',\xf0]w\xccG\x17\x01\x1c|9C\xbc!\x00\x00' # """Init: node-mem: 0X25D5E71A980, hook-mem: 0X25DE989A090, node-uuid: b',\xf0]w\xccG\x17\x01\x1c|9C\xbc!\x00\x00'""" # ...

So, there is neither a persistent plugin hook nor a president node in the scene for your plugin. Using globals is fine as long as they are constants. But when you want to delete them, it implies that you want to treat them as variables which more often than not will lead into problems.

You could have a global dict where you store settings under node UUIDs and where you only put nodes whose UUID has appeared more than once in the NodeData.Init of yours. That will sort of work, but it would be better to attach the data to the plugin hook instance, i.e., self of MyTagData as you will side step a lot of global variable problems with that. That would mean that you have to init these values every time the node is initialized.

But that plugin hook instance approach is still non-ideal due to the volatility of hooks. The best way to handle this, is to add these values simply to the data container of the node. This way they will be serialized and deleted with the node.

Cheers,
Ferdinand

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