I want to draw a line, and to update this line with more points.
Now i render the line, but as soon I do a update which changes the vertices
size the line dissapears.
please submit an example / suggestions if anyone have, before im going totally
nuts! :)
PS.
1. Im doing the update via a callback ( in the frame() traversal)
2. Also all osg objects are set to DYNAMIC
3. and the positions are correct
4. i use osg 2.4.0 on vista
5. i use SceneViewer in an Embedded window to render
My code is something like this:
MyClass : public Group
{
osg::ref_ptr<osg::Geode> _lineGeode;
osg::ref_ptr<osg::Geometry> _line;
osg::ref_ptr<osg::DrawArrays> _drawArrays;
osg::ref_ptr<osg::Vec3Array> _vertices;
osg::ref_ptr<osg::StateSet> _lineStateSet;
MyClass() // INIT My Osg variables
{
// stateset attributes
_lineStateSet = new osg::StateSet;
_lineStateSet->setDataVariance(osg::Object::DYNAMIC);
// create line primitive
_vertices = new osg::Vec3Array;
_vertices->setDataVariance(osg::Object::DYNAMIC);
_line = new osg::Geometry;
_line->setDataVariance(osg::Object::DYNAMIC);
_line->setVertexArray(_vertices.get());
_line->setStateSet(_lineStateSet.get());
//_line->setUseDisplayList(false);
//_line->setUseVertexBufferObjects(false);
_drawArrays = new osg::DrawArrays;
_drawArrays->setDataVariance(osg::Object::DYNAMIC);
_line->addPrimitiveSet(_drawArrays.get());
_lineGeode = new osg::Geode;
_lineGeode->setDataVariance(osg::Object::DYNAMIC);
_lineGeode->addDrawable(_line.get());
addChild(_lineGeode.get());
}
Update()
{
//_vertices->clear(); // TRIED THIS FIRST
_vertices = new osg::Vec3Array(_size);
_vertices->setDataVariance(osg::Object::DYNAMIC);
double x,y,z;
for(int i=0; i<_size; i++)
{
MyGet(x,y,z);
//_vertices->push_back(osg::Vec3((float)x,(float)y,(float)z);
(*_vertices)[i].set((float)x,(float)y,(float)z);
}
_drawArrays->set(osg::PrimitiveSet::LINE_STRIP, 0, _size);
// PS HAVE TRIED LOT OF DIFFERENT VARIATIONS OF
THESE
_drawArrays->dirty();
_line->setVertexArray(_vertices.get());
_line->setPrimitiveSet(0,_drawArrays.get());
_lineGeode->setDrawable(0, _line.get());
_lineGeode->dirtyBound();
dirtyBound();
}
Thank you very much!
Erlend
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