RenderData Manual


A RenderData object represents a set of render settings of a BaseDocument. The render settings include:

  • Various parameters like resolution, image format, save path etc.
  • A list of MultipassObject elements that represent multipasses.
  • A list of BaseVideoPost elements that represent post filters or render engines.

RenderData objects are an instance of Rbase.


RenderData elements can be accessed from the BaseDocument:

// This example prints the name of the active render settings.
const RenderData* const renderData = doc->GetActiveRenderData();
ApplicationOutput("Active RenderData: " + renderData->GetName());
String GetName() const
Definition: c4d_baselist.h:2363
Definition: c4d_basedocument.h:144
#define ApplicationOutput(formatString,...)
Definition: debugdiagnostics.h:210
const char * doc
Definition: pyerrors.h:226


RenderData objects can be created with the usual tools:

The RenderData object can be handed over to a BaseDocument using:

// This example adds a new RenderData to the document and set this RenderData as the active one.
RenderData* const renderData = RenderData::Alloc();
if (renderData == nullptr)
return maxon::OutOfMemoryError(MAXON_SOURCE_LOCATION);
renderData->SetName("Preview Render Settings"_s);
void SetName(const maxon::String &name)
Definition: c4d_baselist.h:2369
static RenderData * Alloc(void)
Definition: memoryallocationbase.h:67


RenderData is based on GeListNode and the render settings are organized in a tree. This tree can be navigated with:

// This example searches for the topmost parent of the active RenderData
// and sets it as the active one.
RenderData* const renderData = doc->GetActiveRenderData();
RenderData* parentRenderData = renderData;
// search for the topmost parent
while (parentRenderData->GetUp())
parentRenderData = parentRenderData->GetUp();
RenderData * GetUp(void)
Definition: c4d_basedocument.h:187


The RenderData object gives access to render settings, Multipasses and post effects.


RenderData is based on BaseList2D so the data can be accessed with

The container IDs are defined in drendersettings.h.

// This example sets the resolution of the active render settings to 720p
// and enables the "Stereoscopic" parameter group
RenderData* const renderData = doc->GetActiveRenderData();
BaseContainer& bc = renderData->GetDataInstanceRef();
bc.SetInt32(RDATA_XRES, 1280);
bc.SetInt32(RDATA_YRES, 720);
bc.SetBool(RDATA_STEREO, true);
Definition: c4d_basecontainer.h:47
void SetBool(Int32 id, Bool b)
Definition: c4d_basecontainer.h:498
void SetInt32(Int32 id, Int32 l)
Definition: c4d_basecontainer.h:505
const BaseContainer & GetDataInstanceRef() const
Definition: c4d_baselist.h:2344
Definition: drendersettings.h:430
Definition: drendersettings.h:154
Definition: drendersettings.h:155

Changing the RDATA_RENDERENGINE parameter to change the render engine will not automatically create the needed video post for that render engine. The video post has to be created manually.

// This example sets "Hardware" as the current renderer.
// and adds the "Hardware" post effect
RenderData* const renderData = RenderData::Alloc();
if (renderData == nullptr)
return maxon::OutOfMemoryError(MAXON_SOURCE_LOCATION);
renderData->SetName("Hardware Rendering"_s);
// insert render data
// add "Hardware" post effect
if (videoPost == nullptr)
return maxon::OutOfMemoryError(MAXON_SOURCE_LOCATION);
// set "Hardware" as active renderer
BaseContainer& bc = renderData->GetDataInstanceRef();
Definition: c4d_videopost.h:24
static BaseVideoPost * Alloc(Int32 type)
void InsertVideoPost(BaseVideoPost *pvp, BaseVideoPost *pred=nullptr)
Definition: drendersettings.h:41
Definition: drendersettings.h:39

If a given RenderData element is active can be checked with a bit. To set a given RenderData object as the active one, use BaseDocument::SetActiveRenderData().

// This example loops through all topmost render settings
// and checks if the given element is the active one.
RenderData* renderData = doc->GetFirstRenderData();
while (renderData != nullptr)
ApplicationOutput("RenderData: " + renderData->GetName());
// check if this RenderData object is the active render setting
if (renderData->GetBit(BIT_ACTIVERENDERDATA))
ApplicationOutput("--> active RenderData");
renderData = renderData->GetNext();
Bool GetBit(Int32 mask) const
Definition: c4d_baselist.h:2252
RenderData * GetNext(void)
Definition: c4d_basedocument.h:175
Active render data.
Definition: ge_prepass.h:920

The image format settings are defined in a maxon::DataDictionary that is saved within the BaseContainer. These functions are used to access the image format settings:

// This example sets the render image format and configures its settings.
// access render data
RenderData* const renderData = doc->GetActiveRenderData();
if (renderData == nullptr)
return maxon::UnexpectedError(MAXON_SOURCE_LOCATION);
BaseContainer* const renderDataBaseContainer = renderData->GetDataInstance();
if (renderDataBaseContainer == nullptr)
return maxon::UnexpectedError(MAXON_SOURCE_LOCATION);
// set OpenEXR format
renderDataBaseContainer->SetInt32(RDATA_FORMAT, FILTER_EXR);
// define OpenEXR settings
maxon::DataDictionary exportSettings;
exportSettings.Set(maxon::MEDIASESSION::OPENEXR::EXPORT::HALFFLOAT, true) iferr_return;
exportSettings.Set(maxon::MEDIASESSION::OPENEXR::EXPORT::LAYERNUMBERING, true) iferr_return;
// store settings in BaseContainer
BaseContainer subContainer;
SetImageSettingsDictionary(exportSettings, &subContainer, FILTER_EXR) iferr_return;
// store container in render data
renderDataBaseContainer->SetContainer(RDATA_SAVEOPTIONS, subContainer);
maxon::Result< void > SetImageSettingsDictionary(const maxon::DataDictionary &settings, BaseContainer *data, Int32 filterId)
void SetContainer(Int32 id, const BaseContainer &s)
Definition: c4d_basecontainer.h:597
const BaseContainer * GetDataInstance() const
Definition: c4d_baselist.h:2328
Definition: drendersettings.h:69
Definition: drendersettings.h:71
#define FILTER_EXR
Definition: ge_prepass.h:199
#define iferr_return
Definition: resultbase.h:1465
// This example reads the target image settings.
// access render data
RenderData* const renderData = doc->GetActiveRenderData();
if (renderData == nullptr)
return maxon::UnexpectedError(MAXON_SOURCE_LOCATION);
BaseContainer* const renderDataBaseContainer = renderData->GetDataInstance();
if (renderDataBaseContainer == nullptr)
return maxon::UnexpectedError(MAXON_SOURCE_LOCATION);
// check for openEXR
const Int format = renderDataBaseContainer->GetInt32(RDATA_FORMAT);
return maxon::OK;
// get container with format options
BaseContainer subContainer = renderDataBaseContainer->GetContainer(RDATA_SAVEOPTIONS);
// get DataDictionary
const maxon::DataDictionary data = GetImageSettingsDictionary(&subContainer, FILTER_EXR) iferr_return;
// get compression method
maxon::Id method = data.GetOrDefault(maxon::MEDIASESSION::OPENEXR::EXPORT::COMPRESSIONMETHOD);
DiagnosticOutput("OpenEXR compression method: @", method);
const char * format
Definition: abstract.h:183
maxon::Result< maxon::DataDictionary > GetImageSettingsDictionary(const BaseContainer *data, Int32 filterId)
Int32 GetInt32(Int32 id, Int32 preset=0) const
Definition: c4d_basecontainer.h:303
BaseContainer GetContainer(Int32 id) const
Definition: c4d_basecontainer.h:418
Definition: apibaseid.h:253
maxon::Int Int
Definition: ge_sys_math.h:64
return OK
Definition: apibase.h:2667
#define DiagnosticOutput(formatString,...)
Definition: debugdiagnostics.h:176
struct _Py_Identifier struct _Py_Identifier PyObject struct _Py_Identifier PyObject PyObject struct _Py_Identifier PyObject PyObject PyObject ** method
Definition: object.h:330


A render multipass contains different elements of the render result. What multipasses should be created is stored in a list of MultipassObject elements.

See also MultipassObject Manual.

// This code loops though all multipasses searching for render buffers.
RenderData* const renderData = doc->GetActiveRenderData();
MultipassObject* multipass = renderData->GetFirstMultipass();
while (multipass != nullptr)
GeData data;
// get the type of the multipass
if (multipass->GetParameter(typeParamID, data, DESCFLAGS_GET::NONE))
// if this pass is a object buffer
// read the object buffer ID
multipass->GetParameter(bufferParamID, data, DESCFLAGS_GET::NONE);
const Int32 bufferID = data.GetInt32();
ApplicationOutput("Buffer ID: " + String::IntToString(bufferID));
multipass = multipass->GetNext();
Bool GetParameter(const DescID &id, GeData &t_data, DESCFLAGS_GET flags)
Definition: lib_description.h:330
Definition: c4d_gedata.h:83
Int32 GetInt32(void) const
Definition: c4d_gedata.h:427
Definition: c4d_basedocument.h:113
MultipassObject * GetNext(void)
Definition: c4d_basedocument.h:127
MultipassObject * GetFirstMultipass()
static String IntToString(Int32 v)
Definition: c4d_string.h:495
maxon::Int32 Int32
Definition: ge_sys_math.h:60
Object buffer multipass channel.
Definition: c4d_videopostdata.h:140
Definition: zmultipass.h:6
Definition: zmultipass.h:8

Post Effects

Post effects are executed during the rendering process to apply filters like color correction to the final image. BaseVideoPost objects can also represent a render engine. These BaseVideoPost elements are stored in a list.

See also BaseVideoPost Manual.

// This example loops through all video posts,
// searches for the "Watermark" post effect and enables it
RenderData* const renderData = doc->GetActiveRenderData();
BaseVideoPost* videoPost = renderData->GetFirstVideoPost();
while (videoPost != nullptr)
// check if this is a "Watermark"
if (videoPost->GetType() == 1025462)
videoPost = videoPost->GetNext();
BaseVideoPost * GetNext(void)
Definition: c4d_videopost.h:56
Bool SetParameter(const DescID &id, const GeData &t_data, DESCFLAGS_SET flags)
Int32 GetType() const
Definition: c4d_baselist.h:1393
BaseVideoPost * GetFirstVideoPost()
Definition: vpwatermark.h:68

Further Reading