Hello,
I'm trying to use node visitors from python 2.6 with osg 2.6 and
osgswig. However
for some reason I cannot use a subclass of osg.NodeVisitor. I crafted a simple
illustrative example that fails with this message:
/home/seb/Devel/arboris-python/tst_nv.pyc in test()
/home/seb/.local/lib/python2.6/site-packages/OpenSceneGraph/osg.pyc in
accept(*args)
14578 def accept(*args):
14579 """accept(self, NodeVisitor nv)"""
> 14580 return _osg.Group_accept(*args)
14581
14582 def asGroup(*args):
TypeError: in method 'Group_accept', argument 2 of type 'osg::NodeVisitor &'
Any hint why this is happening ?
Thanks !
PS: I also filed the issue as
http://code.google.com/p/osgswig/issues/detail?id=36
--
Cheers,
SB
# coding=utf-8
"""
Visualization of a simulation
This module is based on the openscenegraph (osg) 2.6 python wrappers.
Scene graph basics
------------------
A scene graph is a data structure that arranges the logical and
spatial representation of a graphical scene. It consists of a
collection of *nodes* in a tree or graph structure. In general a node
may have many children but only a single parent, with the effect of a
parent apparent to all its child nodes. For instance, a geometrical
transformation matrix node would move all its children.
In some cases, a single (child) node may be shared between several
parents, for instance when the same geometry is displayed several times
simultaneously (this saves memory).
OSG in 20"
----------
TODO: finish
Classes:
- Node
- Group
- Geode (*geometry node*)
- MatrixTransform
- Switch
A geode can contain:
- DrawableShape
- Geometry
-
The Viewer class can manage multiple synchronized cameras to
render a single view spanning multiple monitors. Viewer creates its own
window(s) and graphics context(s) based on the underlying graphics system
capabilities, so a single Viewer-based application executable runs on
single or multiple display systems.
Internals
---------
The :class:`WorldDrawer` class creates a graphic representation of an
arboris world as an OSG graph. Several properties of the world are
represented (shapes, inertia ellispoids,...), and the graphics can be
tuned with a dict of options, whose default values are given by the
:func:`graphic_option` function. The object stores a ref to the arboris
world in order to update the representation when the bodies move.
The :func:`init_viewer` function creates an OSG Viewer and an OSG
KeayboardHandler. It is the place where window size, camera position
and keyboard shortcuts are set.
The end user can draw a world through, at choice, a :class:`DrawerPlugin`
object, or superseding the "raw" :class:`core.World` object by a
:class:`visuosg.DrawableWorld` one.
"""
__author__ = ("Sébastien BARTHÉLEMY <sebastien.barthel...@gmail.com>",
"Joseph SALINI <joseph.sal...@gmail.com>")
import os
if os.name is 'nt':
import osg, osgDB, osgGA, osgViewer, osgText
else:
from OpenSceneGraph import osg, osgDB, osgGA, osgViewer, osgText
class WithoutInitNodeVisitor(osg.NodeVisitor):
def apply(self, node):
print node.getName()
class WithInitNodeVisitor(osg.NodeVisitor):
def __init__(self):
pass
def apply(self, node):
print node.getName()
def test():
print 'running test'
root = osg.Group()
root.setName('root')
child = osg.Group()
child.setName('child')
root.addChild(child)
# this does nothing:
root.accept(osg.NodeVisitor())
# idem:
root.accept(WithoutInitNodeVisitor())
# this fails:
root.accept(WithInitNodeVisitor())
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