Well, it didntt work for me. :-(
I'm actaully calling osg::viewer::frame() a few 100x / ms, I turned off
DisplayLists for the geometry, did not call setVertexArray(vad), did not call
dirtyDisplayList() and the line is not being drawn at all now.
I've tried leaving setDisplayList (true) and calling the method
dirtyDisplayList() and not calling setVertexArray(vad). That doesn't work
either.
Nothing has worked so far except to call setVertexArray(vad);
In my mind, the method, dirtyDisplayList() should 1) dirty my display list 2)
rebuild it and therefore during the next draw sequence of the viewer, the line
should be drawn. But that simply is not the case.
My best guess is: Some flag w/in the Geometry/Drawable is not being set to
"dirty" and some flag is not being set to "redaw" once the Geometry/Drawable is
dirty. That's the nearest I can tell.
Do you have any more suggestions? [Question] Thx....
code to "draw line" after initial setup ----------
osg::Vec3Array *vad = dynamic_cast<osg::Vec3Array *>
(m_ogeomTrailGeometry->getVertexArray());
vad->push_back(osg::Vec3(x,y,z));
osg::DrawArrays *drArrys = dynamic_cast<osg::DrawArrays *>
(m_ogeomTrailGeometry->getPrimitiveSet(0));
drArrys->setFirst(0);
drArrys->setCount(vad->size());
m_ogeomTrailGeometry->dirtyDisplayList(); // doesn't work
// m_ogeomTrailGeometry->setVertexArray(vad); // works when uncommented
Paul Martz wrote:
> If you use osgViewer::Viewer::run(), then you're rendering constantly and
> don't need to do anything else to tell it to redraw.
>
> If you're using osgViewer::Viewer::frame(), then you need to call that
> function.
>
> Paul Martz
> Skew Matrix Software LLC
> http://www.skew-matrix.com
> +1 303 859 9466
>
> -----Original Message-----
> From:
> [mailto:] On Behalf Of Allen
> Saucier
> Sent: Thursday, April 16, 2009 8:03 AM
> To:
> Subject: Re: Dinamic Line Drawing
>
> Wow, that easy? ha, ha...
>
> Paul, how does the "system" know when to redraw after I've added to the
> vertices? Don't I have to tell it to redraw after I've added a vertex and
> up'ed the vertex counter?
>
> -vertex counter == osg::DrawArrays *vad; -new vertices added to *vad w/
> push_back() cmd
>
>
> Paul Martz wrote:
>
> > setUseDisplayLists( false ).
> >
> > Paul Martz
> > Skew Matrix Software LLC
> > http://www.skew-matrix.com
> > +1 303 859 9466
> >
> > -----Original Message-----
> > From:
> > [mailto:] On Behalf Of Allen
> > Saucier
> > Sent: Wednesday, April 15, 2009 3:44 PM
> > To:
> > Subject: Re: Dinamic Line Drawing
> >
> > Thanks Paul! I didn't understand that in the previous postings.
> > Would you mind telling me how to "disable" the display listings for this
> >
> geometry?
>
> >
> >
> > ** PAUL wrote ***
> > Your geometry is probably using display lists (on by default).
> > setVertexArray will dirty and rebuild them. A more efficient solution
> > would be to disable display lists. If you do that, you should be able
> > to change individual elements of your array and not have to set the entire
> >
> array.
>
> >
> > Paul Martz
> > Skew Matrix Software LLC
> > http://www.skew-matrix.com
> > +1 303 859 9466
> >
> > ------------------------
> > ----
> > Allen
> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=10279#10279
> >
> >
> >
> >
> >
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> >
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>
>
> ------------------------
> ----
> Allen
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=10304#10304
>
>
>
>
>
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------------------------
Allen
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=10315#10315
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