Hi Sean,
Le mardi 06 octobre 2009 à 09:26 -0500, Sean Spicer a écrit :
> Hi Osg-Users,
>
>
> Here's a topic that I cannot seem to find any reference in the
> archives for. I'm trying to create an Axes rotation indicator Glyph
> in the lower left-hand corner of our viewer (X, Y, Z). I've got
> working code for this (see below), but it is an orthographic
> projection, while my scene is perspective. The axes rotation
> indicator works correctly, (e.g. it correctly matches the rotation of
> the trackball & scene) but because it is ortho and the scene is
> perspective, it's quite jarring to the user. Can someone suggest how
> I can modify the code below so that it correctly maps the axes in
> perspective (ideally, the same perspective frustum as my scene)?
>
Maybe you could have look at delta3d Compass class:
http://delta3d.sourceforge.net/API/html/classdt_core_1_1_compass.html
I think it is doing exactly what you're looking for...
>
> Many thanks.
>
Cheers, Pierre.
>
> Sean
>
>
> Code
> ---------------------------------------
>
>
> #ifndef OsgAxes_h
> #define OsgAxes_h
>
>
> // OSG Includes
> #include <osg/Group>
> #include <osg/Geometry>
> #include <osg/Camera>
> #include <osg/Quat>
> #include <osg/MatrixTransform>
> #include <osg/Referenced>
> #include <osg/NodeCallback>
> #include <osgGA/TrackballManipulator>
>
>
> class OsgAxes : public osg::Group
> {
>
>
> public:
>
>
> // Public Constructor
> explicit OsgAxes(const osgGA::TrackballManipulator &trackball);
>
>
> // Public Destructor
> virtual ~OsgAxes();
>
>
> void updateCurrentRotation();
>
>
> private:
>
>
> osg::Geometry *createAxes();
>
>
> // Prevent Copy & Assignment
> OsgAxes(const OsgAxes &);
> OsgAxes &operator=(const OsgAxes &);
>
>
> osg::ref_ptr<osg::MatrixTransform> m_rotation;
>
>
> const osgGA::TrackballManipulator &m_trackball;
> };
>
>
> class AxesNodeCallback : public osg::NodeCallback
> {
> public:
> virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
> {
> osg::ref_ptr<OsgAxes> axes =
> dynamic_cast<OsgAxes*> (node);
> if(axes)
> {
> axes->updateCurrentRotation();
> }
> traverse(node, nv);
> }
> };
>
>
> OsgAxes::OsgAxes(const osgGA::TrackballManipulator &trackball)
> : m_trackball(trackball)
> {
> osg::Camera *camera = new osg::Camera;
> //camera->setProjectionMatrix(osg::Matrix::ortho2D(0, 1280, 0, 1024));
> camera->setProjectionMatrix(osg::Matrix::ortho2D(0, 1280, 0, 1024));
> camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
> camera->setViewMatrix(osg::Matrix::identity());
> camera->setClearMask(GL_DEPTH_BUFFER_BIT);
> camera->setRenderOrder(osg::Camera::POST_RENDER);
> camera->setAllowEventFocus(false);
>
>
> osg::Geode* geode = new osg::Geode();
>
>
> // turn lighting off for the text and disable depth test to ensure
> it's always ontop.
> osg::StateSet* stateset = geode->getOrCreateStateSet();
> stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
>
>
> geode->addDrawable(createAxes());
>
>
> m_rotation = new osg::MatrixTransform();
> m_rotation->setMatrix(osg::Matrix::identity());
> m_rotation->addChild(geode);
>
>
> osg::MatrixTransform *scale = new osg::MatrixTransform();
> scale->setMatrix(osg::Matrix::scale(osg::Vec3(100.0f, 100.0f,
> 100.0f)));
> scale->addChild(m_rotation.get());
>
>
> osg::MatrixTransform *translate = new osg::MatrixTransform();
> translate->setMatrix(osg::Matrix::translate(osg::Vec3(100.0f, 100.0f,
> 0.0f)));
> translate->addChild(scale);
>
>
> camera->addChild(translate);
> addChild(camera);
>
>
> setUpdateCallback(new AxesNodeCallback);
> }
>
>
> OsgAxes::~OsgAxes()
> {
>
>
> }
>
>
> osg::Geometry * OsgAxes::createAxes()
> {
> osg::Geometry* geom = new osg::Geometry;
>
>
> osg::Vec3Array* vertices = new osg::Vec3Array;
> vertices->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));
> vertices->push_back(osg::Vec3(0.5f, 0.0f, 0.0f));
> vertices->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));
> vertices->push_back(osg::Vec3(0.0f, 0.5f, 0.0f));
> vertices->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));
> vertices->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
> geom->setVertexArray(vertices);
>
>
> osg::Vec3Array* normals = new osg::Vec3Array;
> normals->push_back(osg::Vec3(0.0f,0.0f,1.0f));
> geom->setNormalArray(normals);
> geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
>
>
> osg::Vec4Array* colors = new osg::Vec4Array;
> colors->push_back(osg::Vec4(1.0f,0.0,0.0f,1.0f));
> colors->push_back(osg::Vec4(0.0f,1.0,0.0f,1.0f));
> colors->push_back(osg::Vec4(0.0f,0.0,1.0f,1.0f));
> geom->setColorArray(colors);
> geom->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);
>
>
> geom->addPrimitiveSet(new osg::DrawArrays(GL_LINES,0,6));
>
>
> osg::StateSet* stateset = geom->getOrCreateStateSet();
> osg::LineWidth *lw = new osg::LineWidth(2.0f);
> stateset->setAttribute(lw);
>
>
> return geom;
> }
>
>
> void OsgAxes::updateCurrentRotation()
> {
> osg::Matrix mat(m_trackball.getRotation().inverse());
> m_rotation->setMatrix(mat);
> }
>
>
>
>
> ---------------------------------------
> End Code
>
>
> _______________________________________________
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Pierre BOURDIN
I.M.E.R.I.R.
Av. Pascot BP 90443
66004 PERPIGNAN
tél: 04 68 56 84 95
fax: 04 68 55 03 86
email: bour...@imerir.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_______________________________________________
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
