Thx everyone!! for the help. :D :D You've given me a lot to think about. I
really appreciate your time.
J-S, here's my code that now works but still "drags" a little after a few
thousand iterations. I found that setVertexArray is (I believe, but could be
totally wrong) actually "copying" the array I send it. After a few thousand
times of being called, it really slows down my entire interface. In fact, my
interface Almost crawls to a halt calling setVertexArray() each time through
the frame loop after about 4000 calls to it.
And I'm drawing a LOT of small line segments each millisecond to make up the
long "looking" line.
I'm not using vertex buffer objects... yet. if I need to switch to them, I
will. Though that will be in the land of experimentation for me too. ha,
ha,... :-)
I found that dirtyDisplayList() w.o dirtyBound() did nothing. I found that
dirtyBound() worked all by itself to get the line to draw during each iteration
of my osg::viewer::frame loop.
I'm using osg::PrimitiveSet::LINE_STRIP as my primitive type and I do not need
to push_back 2 vertices per line segment - I think. [Embarassed] At least, my
line is being drawn... :)
Honestly, I think it's the way I'm drawing the line. I don't believe there is
a bug in OSG. I'm just to new @ this stuff.. ha, ha...
here's my code: snippets of it: the 2 main methods w/in my class are 1) setup
my line and 2) then to add to that line one new vertex at a time. This code
actually works but it does 'slow' down after a few thousand iterations and then
speeds up.. and slows down and speeds up...
class COsgPaxNodeSceneElementInfo
{
osg::ref_ptr<osg::DrawArrays> m_podreTrailDrawElements;
osg::ref_ptr<osg::Vec3Array> m_ov3aLineVerticesData;
osg::ref_ptr<osg::Geometry > m_ogeomTrailGeometry;
osg::ref_ptr<osg::Geode > m_ogeoTrailGeode;
osg::Vec3d m_ov3dPrevPos; ///< previous
trail head
bool m_bHasTrail;
void m_vConstructATrail(math::Vector3D &p_v3dVec);
void m_vUpdateTrail(model::PlatformStateVector &p_psvState);
};
void COsgPaxNodeSceneElementInfo::m_vConstructATrail(math::Vector3D &p_v3dVec)
{
// initialize previous to current point/position sent in
m_ov3dPrevPos.set(p_v3dVec.getX(), p_v3dVec.getY(), p_v3dVec.getZ());
// curr pos
osg::Vec3d ov3d(p_v3dVec.getX(), p_v3dVec.getY(), p_v3dVec.getZ());
// ALLOCATE ONCE AND ONLY ONCE
m_podreTrailDrawElements= new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP);
m_ov3aLineVerticesData = new osg::Vec3Array();
m_ogeomTrailGeometry = new osg::Geometry();
m_ogeoTrailGeode = new osg::Geode;
m_ov3aLineVerticesData->push_back(m_ov3dPrevPos); // prev pos
m_ov3aLineVerticesData->push_back(ov3d); // curr pos
m_podreTrailDrawElements->setFirst(0);
m_podreTrailDrawElements->setCount(m_ov3aLineVerticesData->size());
m_ogeomTrailGeometry->addPrimitiveSet(m_podreTrailDrawElements.get());
m_ogeomTrailGeometry->setVertexArray(m_ov3aLineVerticesData.get());
// attempt to draw lines faster by disabling display lists &
// then with each new vertex added, call dirtyBound() on the geometry.
m_ogeomTrailGeometry->setUseDisplayList(false);
m_ogeoTrailGeode->addDrawable(m_ogeomTrailGeometry.get());
// ADD ONLY ONCE to the Node Scene
m_no3vViewer->m_iAddElementToScene(m_ogeoTrailGeode.get()); // equivalent to
root->addChild(m_ogeoTrailGeode.get()); but "root" of the osg node scene is
actually located w/in another class object, not this one.
// keep track of fact that this node scene elem has a trail
m_bHasTrail = true;
} // m_vConstructATrail
void COsgPaxNodeSceneElementInfo::m_vUpdateTrail(
model::PlatformStateVector &p_psvState)
{
if (!m_bHasTrail)
return;
static bool b_trailIsShowing=true; // trails on be default
static double x,y,z;
x=p_psvState.getPosition().getX();
y=p_psvState.getPosition().getY();
z=p_psvState.getPosition().getZ();
// for now, just keep current PTL around;
// unused @ moment, however
m_dPtl=p_psvState.getOrientation().getW();
m_ov3aLineVerticesData->push_back(osg::Vec3(x,y,z)); // prev pos
m_podreTrailDrawElements->setFirst(0);
m_podreTrailDrawElements->setCount(m_ov3aLineVerticesData->size());
m_ogeomTrailGeometry->dirtyBound(); // forces redraw
} // m_vUpdateTrail
------------------------
Allen
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=10322#10322
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