Re: [PyOpenGL-Users] scene graph examples?

[Mike C. F. <mcf...@ro...>]

Samples using scenegraphs (directly instantiated, not loading from a file):
    glelathe.py
    indexedfaceset_lit_npf.py
    indexedfaceset_lit_npv.py
    mouseover.py
    particles_simple.py
    point_and_click.py
    selectrendermode.py
    simplerotate.py
    wx_with_controls.py

Most of the tests are actually using scenegraph nodes, they just don't 
use the actual scenegraph *hierarchy*, as they are testing lower-level 
functionality.  OpenGLContext is strongly OO, it's not like VPython 
where you create "script" modules. You get things done by sub-classing 
the BaseContext (which is a class, not an instantiation of a class), 
then overriding methods such as OnInit and getSceneGraph.

Here's your expectation translated:

#! /usr/bin/env python
from OpenGLContext import testingcontext
BaseContext, MainFunction = testingcontext.getInteractive()
from OpenGLContext.scenegraph.basenodes import *

scene = sceneGraph(
    children = [
        Group(
            DEF = 'g',
            children = [
                Transform(
                    DEF = 't',
                    translation = ( 1,2,3 ),
                    children = [
                        Shape(
                            geometry = Box(),
                            # follows VRML97 standard, so normally
                            # want the material Node so that there
                            # will be lighting applied...
                            appearance=Appearance(
                                material = Material(),
                            ),
                        ),
                    ],
                ),
            ],
        ),
    ],
)
class TestContext( BaseContext ):
    def OnInit( self ):
        self.sg = scene
    def getSceneGraph( self ):
        return self.sg

if __name__ == "__main__":
    MainFunction ( TestContext)

I'll look at adding this kind of stuff to this page when I get a chance:
    http://pyopengl.sourceforge.net/context/vrml97.html
since it's likely the "right" place for it.

HTH,
Mike

brett hartshorn wrote:

>Hi,
>
>I could not find any examples using the scene graph nodes in openglcontext 2.0.  All of the
>examples found in tests/ seem to only show how to use direct opengl calls.  None of the examples i
>looked at showed how to work with the scene graph nodes.
>
>How do i do something simple like: create a new group, transform, and model, and then render it?
>I am expecting it would work something like...
>
>from OpenGLContext.scenegraph.basenodes import *
>BaseContext, MainFunction = testingcontext.getInteractive()
>
>g = Group()
>t = Transform()
>geo = Box()
>
>t.tranform(1,2,3)
>
>g.addChildren(t)
>t.addChildren(geo)
>
>viewer = BaseContext
>viewer.setSceneGraphData(g)
>MainFunction(viewer)
>
>
>-brett
>  
>
_______________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://members.rogers.com/mcfletch/