[osg-users] Change color of node read from dxf file

[Diego Mancilla]

I'm a newbie on OpenSceneGraph and 3D development.

 I have a dxf file that contains a bunch of 3DPOLYLINES (with different colors). So far I have been able to read and display them on a viewer, but I haven been able to change the color of the rendered lines. I believe that I'm not understanding properly the graph relationships.

 I'm  using the "Quick Start Guide" as reference and modifying an example that I found on the web.

 A code snippet of what I have:


Code:
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
osg::ref_ptr<osg::Vec4Array> c = new osg::Vec4Array;
geom->setColorArray(c.get());
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
c->push_back(osg::Vec4(1.f, 0.f, 0.f, 1.f));

osg::ref_ptr<osg::Vec3Array> n = new osg::Vec3Array;
geom->setNormalArray(n.get());
geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
n->push_back(osg::Vec3(0.f, -1.f, 0.f));

osg::Node* lines = osgDB::readNodeFile("lines.dxf");
osg::Geode* geode = new osg::Geode;

geode->addChild(lines);
geode->addDrawable(geom.get());

std::cout << "Num Drawables in geode: " << geode->getNumDrawables() << std::endl;

osg::Camera* camera = new osg::Camera;
camera->setViewport(0, 0, this->width(), this->height());
camera->setClearColor(osg::Vec4(0.9f, 0.9f, 1.f, 1.f));
float aspectRatio = static_cast<float>(this->width()) / static_cast<float>(this->height());
camera->setProjectionMatrixAsPerspective(30.f, aspectRatio, 1.f, 1000.f);
camera->setGraphicsContext(_mGraphicsWindow);

_mViewer->setCamera(camera);
_mViewer->setSceneData(geode);
osgGA::TrackballManipulator* manipulator = new osgGA::TrackballManipulator;
manipulator->setAllowThrow(false);
this->setMouseTracking(true);
_mViewer->setCameraManipulator(manipulator);
_mViewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);
_mViewer->realize();



Thank you!

Cheers.

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=75209#75209