Start IPR rendering in the viewport

[freeze]

I register a VideoPostPlugin as a renderer.Now I can render an image to viewport or picture viewer in c4d with my own renderer plugin.
How can I get the message that the scene changed so I can update the render view with new scene data and display in the viewport of c4d ,just like Redshift Start IPR ,using c++.
Many Thanks!

[ferdinand]

Hello @freeze,

thank you for reaching out to us. Scene changes are communicated as the core message EVMSG_CHANGE, such messages can be received in the CoreMessage methods of a GeDialog (and derived types) or MessageData instance.

There is however no data which would inform you what has changed. You are expected to track that yourself. See How to detect a new light and pram change? for one of the cases where we discussed tracking scene changes. The case is for Python which is more or less analogous to C++. They main difference in C++ is that you can use GeMarker directly and do not have to go over MAXON_CREATOR_ID (which is just the data of the GeMarker of the node).

Cheers,
Ferdinand

[freeze]

Hello @ferdinand ,
I have created a Message method as:

Bool SmarayPlugin::Message(GeListNode* node, Int32 type, void* data) 
{

    BaseList2D* const item = static_cast<BaseList2D*>(node);
    if (!item)
        return false;

    BaseContainer* renderdata = item->GetDataInstance();

    switch (type)
    {
    case MSG_DESCRIPTION_COMMAND:
    {
        DescriptionCommand* dc = static_cast< DescriptionCommand*>(data);
        if (dc->_descId[0].id == AOV_MANAGER_BUTTON)
        {
            if (aov_dialog) {
                aov_dialog->Close();
                DeleteObj(aov_dialog);
            }

            aov_dialog = NewObjClear(UISmarayAOVManager, renderdata);
            if (aov_dialog) {
                aov_dialog->Open(DLG_TYPE::ASYNC, 800, 800, 800, 600);
            }
        }
        break;
    }
    default:
        break;
    }

    return VideoPostData::Message(node, type, data);
}

I use it to get the button clicked event to create dialog for setting the AOVs and I find that it may get different type of Message .So can I just check if it is EVMSG_CHANGE and go through my own logic here?

[ferdinand]

Hey @freeze,

no, that would not be correct. This is a NodeData::Message method you are showing us here which hooks into the message stream sent to a node, not the core message stream. As already explained above, you will need the CoreMessage method of a GeDialog (or derived types) or MessageData instance to receive core messages. I also posted a link to (Python) example code above.

There is no dedicated manual for the message system in C++, but we have a small one for the Python API.

Cheers,
Ferdinand

[freeze]

@ferdinand Thank you for answering ,I 'll try it.