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class CbaseExtension
{
    MXparamList *priv;
    void setPrivateExtensionData( MXparamList* pL ) const;
public:
    
    CbaseExtension();
    CbaseExtension( const CbaseExtension &orig );
    CbaseExtension& operator=( const CbaseExtension&  voidother internalCreation ();

   void void internalCreation setPrivateExtensionData( MXparamList* pL );
const;
    virtual ~CbaseExtension();
    virtual CbaseExtension* clone() const = 0;
    virtual const char* getName() const = 0;
    virtual const unsigned int getVersion() const = 0;
    virtual void setExtensionData( MXparamList* p ) const  = 0;

    //User Implemented Optional Methods
    virtual void getFileDependencies( dword& numDependencies, char** &paths ) 
    {
        numDependencies = 0;
    };
    virtual void handleEvent( const char* event , void* param ) {};
    virtual bool initializeForRendering( Cmaxwell* pMaxwell ) = 0;
    virtual void cleanup( Cmaxwell* pMaxwell ) {};

   virtual bool initializePreview( Cmaxwell* pMaxwell )
    {
        return ( true );
    }
    virtual void freePreview( void )
    {
    }
    //Interface Methods
    MXparamList* getExtensionData( void ) const;
    void setEnabled( const bool enable );
    bool isEnabled( void ) const;
};

For example, getFileDependenciesis useful when the extension depends on one or more files. Studio calls this function when doing a "Pack & Go" to retrieve and copy all the dependencies of a given scene. Mxnetwork also calls this function to check all the dependencies of a scene before sending it to the render nodes.   initializeForRendering is called just before rendering starts, and the incoming pMaxwell (always check != NULL ) is useful for accessing the scene, so it is handy to store it as a class member.

The following functions are called exclusively from Studio.: initializePreview and freePreview mainly reset and free the arrays allocated in getProxyDisplay*. Keep a copy of the allocated pointers as members of the class and free them in freePreview.

initializeForRendering

virtual bool initializeForRendering( Cmaxwell* pMaxwell ) = 0;

Called at the initial stage before rendering starts. Useful for pre-allocating everything that will be needed during the render. This is especially important for Procedural Geometry extensions.

Arguments

Cmaxwell* pMaxwell : input, pointer to the scene.

Returns

true on success, false otherwise. false aborts the render.

getFileDependencies

virtual void getFileDependencies( dword& numDependencies, char**& paths );

This function returns all the paths of the files that the extension depends on.

Arguments

dword& numDependencies : output, number of paths.

char**& paths  : output, array of paths. On entry, the pointer is NULL. Allocate with malloc.

Returns

nothing.

initializePreview

virtual bool initializePreview( Cmaxwell* pMaxwell );

Reset all the pointers allocated in getProxyDisplay* and make them ready for reuse.

Arguments

Cmaxwell* pMaxwell : input, pointer to the scene.

Returns

true on success, false otherwise. 

freePreview

virtual void freePreview( void );

Free the allocated pointers in getProxyDisplay*.

Arguments

none.

Returns

nothing.