I thought I was able to do this years ago and had it work alright, so I
think I'm forgetting something...hopefully someone can help.
I need to have my clearcolor and clear masks set outside of osg
glClear(...). If I set OSG;s viewport smaller than my main viewport, I
can still see my scene is getting rendered behind OSG. Also, when I use the
clearnode its setting OSG background to black(this is probably the clue of
what I'm doing wrong). All I'm doing right now is rendering the
cow....nothing else. I am using the clearnode as shown below.
/////////////This here is how I'm creating the viewer/////////////
sceneViewer_[0] = new osgUtil::SceneView();
sceneViewer_[0]->setFrameStamp( frameStamp.get() );
sceneViewer_[0]->setDefaults( osgUtil::SceneView::STANDARD_SETTINGS
);
sceneViewer_[0]->setComputeNearFarMode(
osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR );
////////////This here is how I'm adding the clearnode /////////////////////
osg::Node *loadedModel =
sgDB::readNodeFile("C:/Debug/cow.osg");
if (!loadedModel)
{
OutputDebugString("failed loading model");
system("pause");
}
osg::ClearNode *clear_node = new osg::ClearNode();
clear_node->setRequiresClear( false );
osg::StateSet *stateset = new osg::StateSet();
stateset->setMode( GL_RESCALE_NORMAL,
osg::StateAttribute::ON );
osg::PositionAttitudeTransform *transform0 = new
osg::PositionAttitudeTransform;
transform0->setStateSet(stateset);
transform0->addChild( loadedModel );
transform0->setPosition( osg::Vec3(0,0,0 ) );
clear_node->addChild( transform0 );
sceneViewer_[0]->setSceneData( clear_node );
///////////////This here is how I'm rendering/////////////
glPushAttrib( GL_ALL_ATTRIB_BITS );
glMatrixMode( GL_PROJECTION );
glPushMatrix();
glMatrixMode( GL_TEXTURE );
glPushMatrix();
glMatrixMode( GL_MODELVIEW );
glPushMatrix();
sceneViewer_[0]->setViewport(pCamera->viewParams[0],
pCamera->viewParams[1], pCamera->viewParams[2], pCamera->viewParams[3]);
GLdouble glMat[16];
osg::Matrixd osgMat;
glGetDoublev( GL_PROJECTION_MATRIX, glMat );
osgMat.set( glMat );
sceneViewer_[0]->getProjectionMatrix().set( osgMat );
glGetDoublev( GL_MODELVIEW_MATRIX, glMat );
osgMat.set( glMat );
sceneViewer_[0]->getViewMatrix().set( osgMat );
sceneViewer_[0]->update ();
sceneViewer_[0]->cull ();
sceneViewer_[0]->draw();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_TEXTURE);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib()
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