[osg-users] problem with ortho2D viewport

[ximo o +]

Hello



I'm trying to build a 2D scene with orthographic projection. My problem
is that each time I execute the program, the viewport seems to be
different. I mean each time the quad has different size in the screen.



I'va always used the default viewer before and touching cameras and viewports 
is quite new to me. My not working code is below.



Thank you.



Xim.



int main(int argc, char *argv[]) {

    osg::ArgumentParser arguments(&argc, argv);

    osgViewer::Viewer viewer;



    osg::ref_ptr<osg::Node> root = simpleScene(); // quad with texture



    osg::Camera *camera = new osg::Camera;

    camera->setProjectionMatrix(osg::Matrix::ortho2D(-10, 10, -10, 10));

    camera->setViewport(0, 0, 1280, 1024);

    camera->setViewMatrix(osg::Matrix::identity());



    viewer.setCamera(camera);

    viewer.setSceneData(root.get());



    while(!viewer.done()) {

        viewer.getCamera()->setViewMatrix(osg::Matrix::identity());

        viewer.getCamera()->setViewMatrixAsLookAt(osg::Vec3(0, 0, -10), 
osg::Vec3(0, 0, 0), osg::Vec3(0, 1, 0));

        viewer.frame();

    }



     return 0;

}





osg::Node *simpleScene(void) {


    osg::Image *image = osgDB::readImageFile("tex1.jpg");


    osg::Geometry *geom = new osg::Geometry;


    osg::Texture2D *t2d = new osg::Texture2D;


    t2d->setImage(image);


    t2d->setUnRefImageDataAfterApply(true);





    osg::StateSet *ss = geom->getOrCreateStateSet();


    ss->setTextureAttribute(0, t2d);


    ss->setTextureMode(0, GL_TEXTURE_2D, osg::StateAttribute::ON);





    osg::Vec3Array *v = new osg::Vec3Array;


    osg::Vec3Array *n = new osg::Vec3Array;


    osg::Vec3Array *c = new osg::Vec3Array;


    osg::Vec2Array *t = new osg::Vec2Array;


    v->push_back(osg::Vec3(-1, -1, 0));


    v->push_back(osg::Vec3(1,-1, 0));


    v->push_back(osg::Vec3(1, 1, 0));


    v->push_back(osg::Vec3(-1, 1, 0));


    c->push_back(osg::Vec3(1, 1, 1));


    c->push_back(osg::Vec3(1, 1, 1));


    c->push_back(osg::Vec3(1, 1, 1));


    c->push_back(osg::Vec3(1, 1, 1));


    t->push_back(osg::Vec2(0, 0));


    t->push_back(osg::Vec2(1, 0));


    t->push_back(osg::Vec2(1, 1));


    t->push_back(osg::Vec2(0, 1));


    n->push_back(osg::Vec3(0, 0, -1));


    geom->setVertexArray(v);


    geom->setColorArray(c);


    geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);


    geom->setNormalArray(n);


    geom->setNormalBinding(osg::Geometry::BIND_OVERALL);


    geom->setTexCoordArray(0, t);





    geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS, 0, 
v->size()));


    osg::Geode *geode = new osg::Geode;


    geode->addDrawable(geom);


    return geode;


}
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