Hi,
I am currently trying to build a "dynamic line". I mean the extremities of the
segment can be attached to a node and change everytime the node position
relativelly to the world change. Actually, I have a NodeCullback redefined
class and a geode redefined class.
Here is the code :
Code:
void Trail::_initBefore(){
_drawable = new osg::Geometry;
_bounds = new osg::Vec3Array(2);
_color = new osg::Vec4Array(1);
osg::Vec3Array* normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));
((osg::Geometry*)_drawable)->setNormalArray(normals);
((osg::Geometry*)_drawable)->setNormalBinding(osg::Geometry::BIND_OVERALL);
((osg::Geometry*)_drawable)->setVertexArray(_bounds);
((osg::Geometry*)_drawable)->setColorBinding(osg::Geometry::BIND_OVERALL);
((osg::Geometry*)_drawable)->setColorArray(_color);
((osg::Geometry*)_drawable)->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::LINES,0,2));
_width = new osg::LineWidth(DEF_WIDTH);
((osg::Geometry*)_drawable)->getOrCreateStateSet()->setAttribute(_width,
osg::StateAttribute::ON);
((osg::Geometry*)_drawable)->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OFF);
}
void Trail::updateNode(osg::Vec3 source, osg::Vec3 target, osg::Vec3
sourceCenter, osg::Vec3 targetCenter){
(*_bounds)[0].set(source);
(*_bounds)[1].set(target);
osg::PrimitiveSet* ps = ((osg::Geometry*)_drawable)->getPrimitiveSet(0);
((osg::Geometry*)_drawable)->setPrimitiveSet(0, ps);
}
The method "updateNode" is called everytime one of the extremity of the segment
change of position.
My problem is that when the extremities of the segment are not on the view, the
line color change to blue and the line sometimes disappear.
I don't understand wher the problem might be.
I have the same problem with trace (a Line_Strip that follow an object). In
this case, it is worst because the entire scene disappear under some points of
view.
Here is the code (it's basically the same principle as above)
Code:
void Trace::_initBefore(){
_drawable = new osg::Geometry;
_bounds = new osg::Vec3Array;
_color = new osg::Vec4Array;
_color->push_back(osg::Vec4(1, 1, 1, 1));
((osg::Geometry*)_drawable)->setVertexArray(_bounds);
((osg::Geometry*)_drawable)->setColorArray(_color);
((osg::Geometry*)_drawable)->setColorBinding(osg::Geometry::BIND_OVERALL);
_width = new osg::LineWidth(DEF_WIDTH);
((osg::Geometry*)_drawable)->getOrCreateStateSet()->setAttribute(_width,
osg::StateAttribute::ON);
((osg::Geometry*)_drawable)->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OFF);
osg::Vec3Array* normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));
((osg::Geometry*)_drawable)->setNormalArray(normals);
((osg::Geometry*)_drawable)->setNormalBinding(osg::Geometry::BIND_OVERALL);
((osg::Geometry*)_drawable)->addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP,0,2));
}
void Trace::updateNode(osg::Vec3 source, osg::Vec3 target, osg::Vec3
sourceCenter, osg::Vec3 targetCenter){
if(!(source == osg::Vec3() && target == osg::Vec3())){
if(source != target || firstCallUpdate){
if(!firstCallUpdate){
unsigned int count = _bounds->size();
if(count >= 2){
(*_bounds)[count-1] = _oldPosition;
}
else{
_bounds->push_back(_oldPosition);
_bounds->push_back(target);
}
_bounds->push_back(target);
_oldPosition = targetCenter;
}
else{
_oldPosition = targetCenter;
firstCallUpdate = false;
}
setSource(targetCenter);
osg::DrawArrays* ps =
((osg::DrawArrays*)((osg::Geometry*)_drawable)->getPrimitiveSet(0));
ps->setCount(ps->getCount() + 2);
((osg::Geometry*)_drawable)->setPrimitiveSet(0, ps);
}
}
}
I need some help !
Thank you!
Cheers,
Adrien
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=14216#14216
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