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

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

• drawflags (int) – Draw flags. See MSG_DESCRIPTION_CHECKUPDATE.

• descid (c4d.DescID) – The identifier of the parameter that triggered the command.

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

• id (c4d.DescID) – The description identifier of the bitmap button.

• bmp (c4d.bitmaps.BaseBitmap) – Bitmap for the button.

• bmpflags (int) – Flags. See ICONDATAFLAGS.

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

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

• descid (c4d.DescID) – The description identifier of the parameter.

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.

See also

BaseDocument.SetMode()

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.

Warning

This message is only supported in Python as an outgoing message in node implementations. Sending this message in Python via C4DAtom.Message() will crash Cinema 4D. Use instead c4d.documents.GetAllAssetsNew() to retrieve all asset data from a 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['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', 'flags']

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.

• flags (int) –

  New in version 2024.0.0.

  A combination of the render flags. See RENDERFLAGS.

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