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-   -   passing node3d to c++ (https://forum.worldviz.com/showthread.php?t=1982)

jdoerr 04-23-2009 05:51 AM

passing node3d to c++
 
hello,

xabbu already asked to access the underlaying osg::Node of a node3d object. We own a vizard developer license and could use the modifier plugin, but we'll like to pass a node3d object to c++ using a .dll/.pyd file.
We're able to use PyArg_ParseTuple to parse the according PyObject*. We don't know the implementation of ob_type of node3d.
Is it possible to reach the pointer to the underlaying osg::Node?

Many Thanks for your advice

farshizzo 04-23-2009 03:16 PM

You cannot extract the underlying osg::Node object from the PyObject. You have to use a modifier plugin to get access to the osg::Node object. However, there is nothing stopping you from combining a modifier plugin and a python plugin into a single DLL. Here is the C++ code for a plugin that works both as a Python plugin and a modifier plugin:
Code:

#include "modifier.h"
#include "Python.h"

// DO NOT MODIFY THESE DECLARATIONS----------------
extern "C" __declspec(dllexport) void InitModifier(void *);
extern "C" __declspec(dllexport) void PerformModifier(void *);
extern "C" __declspec(dllexport) void TextureModifier(void *);
extern "C" __declspec(dllexport) void SceneModifier(void *);
extern "C" __declspec(dllexport) void CommandModifier(void *);
extern "C" __declspec(dllexport) void CloseModifier(void *);

void InitModifier(void *modifier)
{
        strcpy(((VizModifierObj*)modifier)->version,"Modifier Example v1.0");
        ((VizModifierObj*)modifier)->dataSize = 0;
        ((VizModifierObj*)modifier)->status = 1;
}

void PerformModifier(void *modifier)
{
        fprintf(stdout,"modifiying node\n");
        ((VizModifierObj*)modifier)->status = 1;
}

void TextureModifier(void *modifier)
{
        ((VizModifierObj*)modifier)->status = 1;
}

void SceneModifier(void *modifier)
{
        ((VizModifierObj*)modifier)->status = 1;
}

void CommandModifier(void *modifier)
{
}

void CloseModifier(void *modifier)
{
}

PyObject* py_do_something(PyObject *self, PyObject *args)
{
        fprintf(stdout,"doing something\n");
        Py_RETURN_NONE;
}

static PyMethodDef ModifierMethods[] = {
        {"do_something", py_do_something, METH_VARARGS},
        {NULL, NULL}
};

extern "C" __declspec(dllexport) void initmodifier()
{
        Py_InitModule("modifier", ModifierMethods);
}

You would then use the following code in your Vizard script to access the plugin:
Code:

import viz
viz.go()

#Treat DLL as Python module
import modifier
modifier.do_something()

#Treat DLL as modifier plugin
mod = viz.addModifier('modifier.dll')
node = viz.add('gallery.ive')
node.modify(mod)



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