C4DAtom and Plugin Messages

The following messages can be send with C4DAtom.Message() and received in the Message methods of CommandData, FalloffData, NodeData, SculptBrushToolData, and ToolData and their derived interfaces.

Warning

Only messages that have an explicit Broadcast to Atoms section in their description are supported to be send with C4DAtom.Message(), and only messages that have an explicit Handle in Plugins section are supported to be received with plugin interfaces. Attempting to send which are not supported in Python will have no effect, or in some cases might even crash Cinema 4D.

Symbol

Numeric Value

Description

c4d.MSG_ANIMATE

300001037

Sent to objects after they have been animated.

c4d.MSG_BASECONTAINER

9

Sent to pass arbitrary data in a container to a node.

c4d.MSG_CHANGE

7

Sent if any data except for the matrix has been changed.

c4d.MSG_COLLECTC4DFALLOFF

440000221

Sent to atoms that might contain a falloff.

c4d.MSG_COMMANDINFORMATION

300001001

Sent to retrieve command information.

c4d.MSG_DESCRIPTION_ALLOWOVERRIDE

431000094

Sent to check if take override operation is allowed.

c4d.MSG_DESCRIPTION_CHECKDRAGANDDROP

26

Sent to ask an atom if a drag and drop operation is accepted.

c4d.MSG_DESCRIPTION_CHECKUPDATE

17

Sent to allow elements to determine the type of refresh after a parameter has been changed.

c4d.MSG_DESCRIPTION_COMMAND

18

Sent for button description elements.

c4d.MSG_DESCRIPTION_CUSTOMGUI_NOTIFICATION

431000175

Sent by a custom GUI to its parent node.

c4d.MSG_DESCRIPTION_EDIT_ENTRY

25

Sent to tell an atom to edit a description entry.

c4d.MSG_DESCRIPTION_GETBITMAP

27

Sent to query a description for a c4d.gui.BitmapButtonCustomGui bitmap.

c4d.MSG_DESCRIPTION_INITUNDO

16

Sent to allows elements to create undo actions for the following parameter changes.

c4d.MSG_DESCRIPTION_POPUP

300001046

Sent to handle description popup menus in the Attribute Manager.

c4d.MSG_DESCRIPTION_POSTSETPARAMETER

19

Sent after a C4DAtom.SetParameter() call.

c4d.MSG_DESCRIPTION_REMOVE_ENTRY

24

Sent to tell an atom to remove a description entry.

c4d.MSG_DESCRIPTION_VALIDATE

20

Sent to update dependencies or to check for invalid values after a parameter change.

c4d.MSG_DOCUMENT_MODE_CHANGED

200000091

Sent to the active tool plugin when document mode is changed.

c4d.MSG_DOCUMENTINFO

1001078

Sent when a document has been loaded, saved, merged or other document related actions occurred.

c4d.MSG_DRAGANDDROP

1018756

Sent to elements in the Object Manager when something is dropped on it.

c4d.MSG_EDIT

21

Sent to perform an action when element is being edited.

c4d.MSG_FILTER

14

Sent to allow or block C4DAtom.MultiMessage() calls.

c4d.MSG_GET_MODATASELECTION

1021339

Sent to retrieve the data of MoGraph selection tags.

c4d.MSG_GET_MODATAWEIGHTS

440000230

Sent to retrieve the data for MoGraph weights tags.

c4d.MSG_GETALLASSETS

112004

Sent to retrieve all assets from an object.

c4d.MSG_GETCUSTOMICON

1001090

Sent to retrieve a custom icon.

c4d.MSG_GETCUSTOMICON_SETTINGS

1041699

Sent to retrieve the custom icon settings of an object.

c4d.MSG_GETREALCAMERADATA

1028476

Sent to get a real camera object from a generator.

c4d.MSG_GETREALTAGDATA

1036447

Sent to get the real tag object from a virtual ‘generator’ tag.

c4d.MSG_MENUPREPARE

22

Sent to allow tags, objects, shaders etc. to do some setup work when called from the menu.

c4d.MSG_MULTI_CLEARSUGGESTEDFOLDER

200000040

Sent to nodes to convert absolute paths to filename.

c4d.MSG_MULTI_DOCUMENTCLONED

11

Sent when a document is being cloned.

c4d.MSG_MULTI_RENDERNOTIFICATION

1001071

Sent to a document and all of its elements before a render starts.

c4d.MSG_POINTS_CHANGED

1

Sent to notify an object its points have changed.

c4d.MSG_POLYGONS_CHANGED

2

Sent to notify an object its polygons have changed.

c4d.MSG_RETRIEVEPRIVATEDATA

23

Sent to retrieve private data from an atom.

c4d.MSG_SCALEDOCUMENT

300001069

Sent to signal that another document with different scale has been merged with the current document.

c4d.MSG_SEGMENTS_CHANGED

10

Sent to notify an object that its segments have changed.

c4d.MSG_SMALLUPDATE

6

Sent if part of an object has changed and does not need cache rebuilding.

c4d.MSG_UPDATE

5

Sent to inform an object that its bounding box must be recalculated. Otherwise use MSG_CHANGE.

c4d.MSG_ANIMATE

Sent to objects after they have been animated.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_BASECONTAINER
Sent to pass arbitrary data in a container to a node.

It is good practice to qualify the content of the container by settings its container identifier via BaseContainer.SetId() or by providing such identifier when instantiating the container.
Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: c4d.BaseContainer
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: c4d.BaseContainer
return: None
c4d.MSG_CHANGE

Sent to atoms when any data aside from their matrix has been changed.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: None
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_COLLECTC4DFALLOFF

Sent to atoms that might contain a falloff.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict[]
return: `dict['falloff']
Parameters

falloff (c4d.modules.mograph.C4D_Falloff) – The contained falloff if there is any.

c4d.MSG_COMMANDINFORMATION
Sent to retrieve command information.

Allows to restrict shortcuts to a dialog. To do so, managergroup has to be set to a dialog identifier. parentid can be set to a command identifier to get its shortcut, icon, tooltip etc. For instance, if IDM_SELECTALL is set for parentid, then command_id inherits the “Select All” command of Cinema 4D.
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['command_id', 'managergroup', 'parentid']
return: dict['managergroup', 'parentid']
Parameters
  • command_id (int) – The command identifier.

  • managergroup (int) – The identifier of the manger group.

  • parentid (int) – The identifier of the parent.

c4d.MSG_DESCRIPTION_ALLOWOVERRIDE

Sent to check if take override operation is allowed.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['_takeData', '_overrideTake', '_descid']
return: dict['_parent', '_parentId', '_allow', '_overrideEnabled']
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['_takeData', '_overrideTake', '_descid']
return: dict['_parent', '_parentId', '_allow', '_overrideEnabled']
Parameters
  • _takeData (c4d.modules.takesystem.TakeData) – Take system context.

  • _overrideTake (c4d.modules.takesystem.BaseTake) – The take asking for the override.

  • _descid (c4d.DescID) – Description ID to be overridden.

  • _parent (c4d.BaseList2D) – Parent node if the override must be assigned to it and not to the original node. Especially useful in case of branched structures.

  • _parentId (c4d.DescID) – If parent is set also a translated parameter ID needs to be set.

  • _allow (bool) – True if the parameter can be overridden, otherwise False.

  • _overrideEnabled (bool) – True if the global switch allow the override, otherwise False.

c4d.MSG_DESCRIPTION_CHECKDRAGANDDROP
Sent to ask an atom if a drag and drop operation is accepted.

Not all parameter types that might appear eligible actually do support this message, it is for example not supported by FieldList parameters.
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['id', 'element']
return: dict['result']
Parameters
  • id (c4d.DescID) – ID of the drop field.

  • element (c4d.BaseList2D) – Element to drop.

  • result (bool) – Set to True if the drop is acceptable, otherwise False.

c4d.MSG_DESCRIPTION_CHECKUPDATE
Sent to allow elements to determine the type of refresh after a parameter has been changed.

This message is being handled by all plugin base classes.
Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['doc', 'drawflags', 'descid']
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None````dict['doc', 'drawflags', 'descid']
return: None
Parameters
c4d.MSG_DESCRIPTION_COMMAND
Sent for button description elements.

See example here.
Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['id']
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['id']
return: None
Parameters

id (c4d.DescID) – The identifier of the parameter that did trigger the command.

c4d.MSG_DESCRIPTION_CUSTOMGUI_NOTIFICATION

Sent by a custom GUI to its parent node.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['_descId', '_customGuiId', '_subId', '_data']
return: None
Parameters
  • _descId (c4d.DescID) – Description ID.

  • _customGuiId (int) – Custom GUI plugin ID.

  • _subId (int) – Message type sub-ID. Depending on the custom GUI implementation a different sub-ID can be passed with different data.

  • _data (c4d.BaseContainer) – Data for the message.

c4d.MSG_DESCRIPTION_EDIT_ENTRY

Sent to tell an atom to edit a description entry.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['id']
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['id']
return: None
Parameters

id (c4d.DescID) – The identifier of the parameter that did trigger the command.

c4d.MSG_DESCRIPTION_GETBITMAP

Sent to query a description for a c4d.gui.BitmapButtonCustomGui bitmap.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['id']
return: dict['bmp', 'bmpflags']
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['id']
return: dict['bmp', 'bmpflags']
Parameters
c4d.MSG_DESCRIPTION_INITUNDO

Sent to allows elements to create undo actions for the following parameter changes.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['doc', 'descid']
return: None
Parameters
c4d.MSG_DESCRIPTION_POPUP

Sent to handle description popup menus in the Attribute Manager.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[‘id’, ‘chosen’, ‘popup’]`
return: dict[‘id’, ‘chosen’, ‘popup’]`
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict[‘id’, ‘chosen’, ‘popup’]`
return: dict[‘id’, ‘chosen’, ‘popup’]`
Parameters
  • id (c4d.DescID) – The identifier of the parameter that triggered the command.

  • chosen (int) – Selected element of the popup.

  • popup (c4d.BaseContainer) – Popup menu container.

c4d.MSG_DESCRIPTION_POSTSETPARAMETER

Sent after a C4DAtom.SetParameter() call.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['descid']
return: None
Parameters

descid (c4d.DescID) – The description identifier of the parameter that has been set.

c4d.MSG_DESCRIPTION_REMOVE_ENTRY

Sent to tell an atom to remove a description entry.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['id']
return: None
Parameters

id (c4d.DescID) – The identifier of the parameter that did trigger the command.

c4d.MSG_DESCRIPTION_VALIDATE
Sent to update dependencies or to check for invalid values after a parameter change.

Used for example to ensure that the inner radius of a light object is always smaller than its outer radius.
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['flags']
return: None
Parameters

flags (int) – Not used.

c4d.MSG_DOCUMENT_MODE_CHANGED

Sent to the active tool plugin when document mode is changed.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_DOCUMENTINFO

Sent when a document has been loaded, saved, merged or other document related actions occurred.

See also

To send MSG_DOCUMENTINFO it is recommended to use BaseDocument.SendInfo().

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['type', 'fileformat', 'filename']
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['type', 'fileformat', 'filename', 'doc', 'bl']
return: None
Parameters
  • type (int) – The message type. See MSG_DOCUMENTINFO_TYPE.

  • fileformat (int) – The file format. See FORMAT Export.

  • filename (str) – The document filename.

  • doc (c4d.documents.BaseDocument) – The current document.

  • bl (c4d.BaseList2D) – The atom that has been inserted. Is being provided when type is MSG_DOCUMENTINFO_TYPE_OBJECT_INSERT, MSG_DOCUMENTINFO_TYPE_TAG_INSERT``or ``MSG_DOCUMENTINFO_TYPE_MATERIAL_INSERT.

c4d.MSG_DRAGANDDROP

Sent to elements in the Object Manager when something is dropped on it.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['doc', 'sender', 'flags', 'type', 'data', 'x', 'y', 'msg']
return: dict['flags', 'type', 'data', 'result']
Parameters
  • doc (c4d.documents.BaseDocument) – The current document.

  • sender (c4d.BaseList2) – The sender of the drag operation.

  • flags (int) – The flags of the operation.

  • type (int) – The drag type.

  • data (PyCObject) – The dragged data.

  • x (int) – The x position where the drag operation has been released.

  • y (int) – The y position where the drag operation has been released.

  • msg (c4d.BaseContainer) – Valid if DRAGANDDROP_FLAG_MSGVALID is set so items like BFM_INPUT_QUALIFIER are available.

  • result (int) – Unused.

c4d.MSG_EDIT
Sent to perform an action when element is being edited.

Is being sent for example when the user does edit an object by double-clicking it in the Object Manager.
Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: None
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_FILTER

Sent to allow or block C4DAtom.MultiMessage() calls.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['type', 'route', 'data']
return: None
Parameters
  • type (int) – Message type.

  • route (int) – Flags. See MULTIMSG_ROUTE.

  • data (PyCObject) – Message data. Depends on the message type.

c4d.MSG_GET_MODATASELECTION

Sent to retrieve the data of MoGraph selection tags.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['sel']
Parameters

sel (c4d.BaseSelect) – The selected clones.

c4d.MSG_GET_MODATAWEIGHTS

Sent to retrieve the data for MoGraph weights tags.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['_weight']
Parameters

_weight (list[float]) – The weight data.

c4d.MSG_GETALLASSETS

Sent to retrieve all assets from an object.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['doc', 'flags', 'assets']
return: dict['assets': list[dict['filename', 'bl', netRequestOnDemand]]]
Parameters
  • doc (c4d.documents.BaseDocument) – The current document.

  • flags (int) – The flags for the operation.

  • assets (list) – List of assets.

  • filename (str) – Filename of the asset.

  • bl (c4d.BaseList2D) – Base list reporting the missing name.

  • netRequestOnDemand (bool) – Net request on demand.

c4d.MSG_GETCUSTOMICON

Sent to retrieve a custom icon.

Changed in version R21: An instance of c4d.IconData can be passed with the fields useDat and dat when returning icon data in plugins. The bitmap data inputs will be ignored when when useDat has been set to True.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['filled', 'bmp', 'x', 'y', 'w', 'h', 'flags']
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict[]
return: dict['filled', 'bmp', 'x', 'y', 'w', 'h', 'flags', 'useDat', 'dat']
Parameters
  • filled (bool) – True if the icon was set.

  • bmp (c4d.bitmaps.BaseBitmap) – Icon’s bitmap. Can be None.

  • x (int) – X coordinate of the upper-left corner of the icon.

  • y (int) – Y coordinate of the upper-left corner of the icon.

  • w (int) – Width of the icon.

  • h (int) – Height of the icon.

  • flags (int) – See ICONDATAFLAGS.

  • useDat (bool) – Must be set to True when the IconData dat should be used.

  • dat (c4d.IconData) – The icon data to use instead of the raw bitmap data.

c4d.MSG_GETCUSTOMICON_SETTINGS

Sent to retrieve the custom icon settings of an object.

New in version R21.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: None
return: dict['setting']
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['setting']
return: None
Parameters

setting (c4d.CustomIconSettings) – The c4d.CustomIconSettings for the atom.

c4d.MSG_GETREALCAMERADATA

Sent to get a real camera object from a generator.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['res']
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict[]
return: dict['res']
Parameters

res (c4d.BaseObject) – The real camera object.

c4d.MSG_GETREALTAGDATA

Sent to get the real tag object from a virtual ‘generator’ tag.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['res']
Parameters

res (c4d.BaseTag) – The real tag.

c4d.MSG_MENUPREPARE

Sent to allow tags, objects, shaders and other classic API nodes to do setup work when called from the menu.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: c4d.BaseContainer
return: None
c4d.MSG_MULTI_CLEARSUGGESTEDFOLDER
Sent to nodes to convert absolute paths to filename.

When “Save Project with Assets” is being invoked, all assets are moved to the new target directory. In this case all absolute paths must be converted to filenames because the files are next to the document and the absolute paths are not needed anymore.

Note

Both MSG_GETALLASSETS and MSG_MULTI_CLEARSUGGESTEDFOLDER are important for “Save Project” to work and to collect all items. This messages must only be supported when also the message MSG_GETALLASSETS is being used to handle assets.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_MULTI_DOCUMENTCLONED

Sent when a document is being cloned.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_MULTI_RENDERNOTIFICATION

Sent to a document and all of its elements before a render starts.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['doc', 'external', 'start', 'animated']
return: dict['external', 'start', 'animated']
Parameters
  • doc (c4d.documents.BaseDocument) – The document to be rendered.

  • external (bool) – True if the rendering is not in the editor view, otherwise False.

  • start (bool) – Determines if this is a start (True) or stop (False) notification. Stop notifications are only sent if the document will not be deleted, which more or less only happens if there is an editor render.

  • animated (bool) – Determines if this is an animation sequence being rendered.

c4d.MSG_POINTS_CHANGED

Sent to notify an object its points have changed.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict['old_cnt', 'new_cnt', 'vc_flags', 'map']
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['old_cnt', 'new_cnt', 'vc_flags', 'map']
return: None
Parameters
  • old_cnt (int) – Number of elements before the change.

  • new_cnt (int) – Number of elements after the change.

  • vc_flags (int) – Flags. See VC_FLAGS.

  • map (list[int]) – Optional translation map.

c4d.MSG_POLYGONS_CHANGED

Sent to notify an object its polygons have changed.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['old_cnt', 'new_cnt', 'vc_flags', 'map']
return: None
Parameters
  • old_cnt (int) – Number of elements before the change.

  • new_cnt (int) – Number of elements after the change.

  • vc_flags (int) – Flags. See VC_FLAGS.

  • map (list[int]) – Optional translation map.

c4d.MSG_RETRIEVEPRIVATEDATA

Sent to retrieve private data from an atom.

Note

Used to obtain loader/saver settings.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: dict[]
return: dict['imexporter']
Parameters

imexporter (c4d.BaseList2D) – Scene loader/saver.

c4d.MSG_SCALEDOCUMENT

Sent to signal that another document with different scale has been merged with the current document.

Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['scale']
return: None
Parameters

scale (float) – The scale of the merged document.

c4d.MSG_SEGMENTS_CHANGED
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: dict['old_cnt', 'new_cnt', 'vc_flags', 'map']
return: None
Parameters
  • old_cnt (int) – Number of elements before the change.

  • new_cnt (int) – Number of elements after the change.

  • vc_flags (int) – Flags. See VC_FLAGS.

  • map (list[int]) – Optional translation map.

c4d.MSG_SMALLUPDATE

Sent if part of an object has changed and does not need cache rebuilding.

Note

This message should be used very carefully, it is there for small performance enhancements. For example, if a polygon selection has been changed, then the caches do not need to be rebuilt; MSG_SMALLUPDATE can be sent.

Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: None
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None
c4d.MSG_UPDATE
Must be sent when the bounding box has to be recalculated.

Otherwise use c4d.MSG_CHANGE.
Broadcast to Atoms
Can be sent with C4DAtom.Message() with the message data data.

data: None
return: None
Handle in Plugins
Can be received as plugin messages with the message data argument data or t_data, depending on the plugin interface Message() implementation:

data: None
return: None