C4D material sharing GvNodeMaster sample

// Graphos 05/10/207
// example of c4d material that store a GvNodeMaster and how to share it using BaseContainer message
// Usage example http://recordit.co/fJlz8Dnf3Y
// Python script => https://pastebin.com/CFrpTfrY

#include <c4d_graphview.h>
#include "c4d.h"
#include "c4d_symbols.h"
#include "msimplematerial.h"
#include "customgui_matpreview.h"
#include "main.h"

// be sure to use a unique ID obtained from www.plugincafe.com
#define ID_SIMPLEMAT 1001164

class RedShiftMaterial : public MaterialData
{
    INSTANCEOF(SimpleMaterial, MaterialData)

private:
    GvWorld* world;
    GvNodeMaster* NodeMaster;

public:
    virtual Bool Init(GeListNode* node);
    virtual void Free(GeListNode *node);
    virtual Bool Message(GeListNode* node, Int32 type, void* data);

    static NodeData* Alloc(void) { return NewObjClear(RedShiftMaterial); }
};

Bool RedShiftMaterial::Init(GeListNode* node)
{
    world = GvGetWorld();
    NodeMaster = world->AllocNodeMaster((BaseList2D*)node, false, true);
    return true;
}

void RedShiftMaterial::Free(GeListNode* node)
{
    world->FreeNodeMaster(NodeMaster);
    NodeMaster = nullptr;
    world = nullptr;
}


Bool RedShiftMaterial::Message(GeListNode* node, Int32 type, void* data)
{
    switch (type)
    {
    case MSG_BASECONTAINER:
    {
        BaseContainer* bc = (BaseContainer*)data;
        bc->SetLink(0, NodeMaster);
        return true;
        break;
    }
    }

    return true;
}


Bool RegisterSimpleMaterial(void)
{
    String name = GeGetDefaultFilename(DEFAULTFILENAME_SHADER_VOLUME) + GeLoadString(IDS_SIMPLEMATERIAL);   // place in default Shader section

    // add a preview scene that can only be selected in the Simple Material's preview
    AddUserPreviewScene(GeGetPluginResourcePath() + String("scene") + String("Stairs.c4d"), ID_SIMPLEMAT, nullptr);

    return RegisterMaterialPlugin(ID_SIMPLEMAT, name, 0, RedShiftMaterial::Alloc, "Msimplematerial", 0);
}