详细描述

Overriding NodeData::Message it is not recommended to check for a nullptr pointer in node->GetDocument() if it is a MATPREVIEW message.
For those messages the document might be nullptr in some cases, but the method should not be aborted.

Macros
#define	MATPREVIEW_GET_OBJECT_INFO
#define	MATPREVIEW_GENERATE_IMAGE
#define	MATPREVIEW_MODIFY_CACHE_SCENE
#define	MATPREVIEW_PREPARE_SCENE
#define	MATPREVIEW_GET_PREVIEW_ID
#define	MATPREVIEW_GET_POPUP_OPTIONS
#define	MATPREVIEW_HANDLE_POPUP_MSG
#define	MATPREVIEW_FREE_USERDATA
#define	MATPREVIEW_COPY_USERDATA
#define	MATPREVIEW_DRAGNDROP_RECV
#define	MATPREVIEW_DRAGNDROP_START
#define	MATPREVIEW_DRAGNDROP_END
#define	MATPREVIEW_GET_DIRTY_COUNT
#define	MATPREVIEW_POPUP_NAME
#define	MATPREVIEW_NULL_SIZE_NAME

Macro Definition Documentation

◆  MATPREVIEW_GET_OBJECT_INFO

#define MATPREVIEW_GET_OBJECT_INFO

Sent by the material preview to get object information from the host. The corresponding data is MatPreviewObjectInfo .

◆  MATPREVIEW_GENERATE_IMAGE

#define MATPREVIEW_GENERATE_IMAGE

Sent by the material preview when the host object is responsible for the rendering ( MatPreviewObjectInfo::bHandlePreview is true ). The corresponding data is MatPreviewGenerateImage .

◆  MATPREVIEW_MODIFY_CACHE_SCENE

#define MATPREVIEW_MODIFY_CACHE_SCENE

Sent by the material preview to let the host modify the preview scene. A pointer to a scene inside the preview scene cache is sent. The corresponding data is MatPreviewModifyCacheScene .

◆  MATPREVIEW_PREPARE_SCENE

#define MATPREVIEW_PREPARE_SCENE

Sent each time the preview wants to render the host scene. The corresponding data is MatPreviewPrepareScene .

◆  MATPREVIEW_GET_PREVIEW_ID

#define MATPREVIEW_GET_PREVIEW_ID

The corresponding data is Int32 . Set it to the ID of the material preview.

◆  MATPREVIEW_GET_POPUP_OPTIONS

#define MATPREVIEW_GET_POPUP_OPTIONS

Let add extra material preview popup menu items to a custom sub-menu.
The corresponding data is a BaseContainer which represents the menu. Insert the menu items. Set the name of the sub-menu with MATPREVIEW_POPUP_NAME.
范例：

case MATPREVIEW_GET_POPUP_OPTIONS : { BaseContainer * bc = static_cast< BaseContainer * > (data);

// Element with index MATPREVIEW_POPUP_NAME is the text of the popup item. bc-> SetString ( MATPREVIEW_POPUP_NAME , GeLoadString (IDS_PARTICLEVOLUME));

// A menu item. (Container entries should start with 1.) bc-> SetString (1, GeLoadString (IDS_PARTICLEVOLUME_HIGH_DENSITY) + (highDensity ? "&c&" : "" ));

// Add an example separator. bc-> SetString (0, "" );

// Yet another menu item. bc-> SetString (2, GeLoadString (IDS_PARTICLEVOLUME_LOW_DENSITY) + (!highDensity ? "&c&" : "" )); return true ; } break ;