Re: [PyOpenGL-Users] scene graph examples?

[brett h. <bha...@ya...>]

Hi Mike,

Is there a way to build the scenegraph *hierarchy* in a cleaner way?
Your example has some crazy indentation going on.  It would be nice to have it more DOM like, ie:
node.appendChild(child)

thanks,
-brett

--- "Mike C. Fletcher" <mcf...@ro...> wrote:
> 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/
> 
> 


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