Hi,
I want to put a IVE Model in the viewer which renders a Texture2D Image as the
viewer's whole background.
Now, I put the texture image into a camera and rendered as the background
successfully. The code is below:
Code:
-(osg::Node *) create2DBGTexture
{
unsigned int w = 480;
unsigned int h = 320;
float vx = (float)w;
float vy = (float)h;
osg::ref_ptr<osg::Geometry> rectBG_geom = new osg::Geometry;
osg::Vec3Array * vertices = new osg::Vec3Array;
vertices->push_back(osg::Vec3(0.0, 0.0, -1.0));
vertices->push_back(osg::Vec3(0.0, vy, -1.0));
vertices->push_back(osg::Vec3(vx, vy, -1.0));
vertices->push_back(osg::Vec3(vx, 0.0, -1.0));
rectBG_geom->setVertexArray(vertices);
osg::Vec2Array * texcoords = new osg::Vec2Array;
texcoords->push_back(osg::Vec2(0.0, 0.0625));
texcoords->push_back(osg::Vec2(0.0, 0.9375));
texcoords->push_back(osg::Vec2(1.0, 0.9375));
texcoords->push_back(osg::Vec2(1.0, 0.0625));
rectBG_geom->setTexCoordArray(0,texcoords);
osg::Vec3Array * normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,0.0f,1.0f));
rectBG_geom->setNormalArray(normals);
rectBG_geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
rectBG_geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,4));
BG_image = new osg::Image;
BG_image->setImage(AVWidth, AVHeight, 1, GL_RGBA, GL_BGRA, GL_UNSIGNED_BYTE,
pAVImage, osg::Image::NO_DELETE);
BG_texture = new osg::Texture2D;
BG_texture->setDataVariance(osg::Object::DYNAMIC);
BG_texture->setImage(BG_image);
BG_texture->setResizeNonPowerOfTwoHint(false);
BG_texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
BG_texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
osg::StateSet* stateset = rectBG_geom->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(0,BG_texture,osg::StateAttribute::ON);
osg::Geode * BG_geode = new osg::Geode;
BG_geode->addDrawable(rectBG_geom);
return BG_geode;
}
-(int) initOsgTree
{
int dwError = 0;
osg::setNotifyLevel(osg::DEBUG_INFO);
// camera
unsigned int w = 480;
unsigned int h = 320;
//create and attach ortho camera for hud text
osg::ref_ptr<osg::Camera> hudCamera = new osg::Camera;
hudCamera->setProjectionMatrix(osg::Matrix::ortho2D(0,w,0,h));
hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
hudCamera->setViewMatrix(osg::Matrix::identity());
hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);
hudCamera->setRenderOrder(osg::Camera::POST_RENDER);
osg::ref_ptr<osg::Group> MARRoot = new osg::Group;
MARRoot->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
hudCamera->addChild([self create2DBGTexture]);
MARRoot->addChild(hudCamera.get());
// viewer
MARViewer = new osgViewer::Viewer();
MARViewer->setSceneData(MARRoot.get());
MARViewer->realize();
MARViewer->frame();
return dwError;
}
My question is:
How do i put the model in the viewer so that it can be showed in the front of
the background? Use two cameras? Put the model in another camera, then add this
camera as the slave camera into viewer? I ever tried it, but it did not work,
maybe my code is wrong. Maybe my thought is not right.
I hope you can give me a hand to help me to solve this question. I will
appreciate you very much.
Thank you!
Cheers,
Tang
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=37357#37357
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