[osg-users] Get the top coordonates from screen of an object
Hi, I'm trying to put a text on the top of a node, a sort of caption. This caption can be added for mutliple objects without being stacked with other captions. My idea is to add those caption to the global scene by getting the coordinates of the top of the followed node and project the text on the screen from the given coordinates. Here are my questions: Have you got a better idea? How can I get the top of the Node directly (I thought to use the LineSegment and BoundingSphere)? Is there an easier (and better for performances) way to get them? Thank you for your answers! Cheers, Adrien -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16077#16077 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Truncated Cone with spheric base
Hi, I have to make a truncated cone with a spheric base, defined by a small radius and a large radius. I have been thinking about that and the best idea I thought to is to define a Geometry with a Shape with quads linking two circles. I wanted to know if there were a lot of ressources lost if I do that, in order to have a proper cone wich is not seeing as a strange shape with quads. Is there a better way to do it? Thank you! Cheers, Adrien -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15634#15634 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Geode blinking
Hi, First of all, english is not my mother tongue, so excuse my faults. I developped an icon with osg, which is an image, facing the camera whatever is placed the camera and has the same size on the screen whatever is the distance from the camera. The problem is that the icon is sometimes blinking when I change the distance of the camera from the icon. The icon is a MatrixTransform containing a geode which is a Billboard. The billboard contains a quad which is textured with the image I want to display. The billboard make the image always facing the screen. The matrixTransform has a method accept(osg::NodeVisitor nv) which change the size of the billboard by changing the bounds of the quad when the distance of the camera comparing to the icon change. I think the problem is that I change the bounds of the quad at the same time the viewer read these bounds. I would like to lock the access to these bounds while I'm changing them but I don't know how to do that. Thank you for your answers. If you need more informations, or a part of the code, I would be glad to tell you. Cheers, Adrien -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15084#15084 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Dynamic line make scene disappear
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
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=14216#14216
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[osg-users] PositionAttitudeTransform - How do I make a rotation
Hi, I'm kind of newbie in 3D developpment and in openSceneGraph. I want to rotate a node using PositionAttitudeTransform::setAttitude but I don't know how to do that. I've tried to make it rotate according ti the fact that x, y and z of the Quat is the coordinate of the vector from the origin (x, x, z) plus an angle (w). But the node has a strange behavior. Can anyone help me? Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9612#9612 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PositionAttitudeTransform - How do I make a rotation
Thank you for the answers. I finally found, thanks to you, how to make it work ! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9657#9657 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Uniform scale dragger?
Same question here ! There is a bug with the scaling perform of MatrixTransform. So I would like to use a 3D scaling of osgManipulator. Thank you ! Excuse the faults. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=9458#9458 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] plugin to load png and jpg images problem
Thank you for your answer. I built the sources for the png plugin and it worked fine. I just have to do the same with the jpg plugin now. Problem solved -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=8439#8439 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] plugin to load png and jpg images problem
Hello ! I have installed Visual Studio 2005 and osg 2.8 in debug and release version. The problem is that I can't load jpg and png images in debug mode (work in release mode). The program is launched but no image appear where it should do. I have this message : Warning: Could not find plugin to read objects from file C:/[...]/X.png I don't understand because I have the libpng13d.lib file in the lib/ folder and I have the osgdb_pngd.dll in the bin/osgplugins-2.8.0/ folder In my project properties, I have correctly configured the paths (the same as in release). Some help here [Wink] Thank you -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=8355#8355 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
