Re: [osg-users] Visibility of lines
Hi,
I think there might be a small bug in osg::OcclusionQueryNode, that I've yet to
find.
Here is a small example with a line triangle, that shows the problem.
I added no face geometry so the lines should basically always be visible when
in view.
Each line is under an OcclusionQueryNode, but under some camera poses using the
trackball manipulator, line 3 isn't visible, although it should be.
When I put all the lines in a osg::Group, they are visible.
Does anybody have an idea where the problem might be?
Code:
#include osg/Group
#include osgViewer/Viewer
#include osgViewer/ViewerEventHandlers
#include osgGA/TrackballManipulator
#include osg/OcclusionQueryNode
#include vector
int main( int argc, char** argv )
{
int width = 640;
int height = 480;
osgViewer::Viewer viewer;
osg::ref_ptrosg::Camera camera = new osg::Camera;
camera-setClearColor(osg::Vec4(1.0, 1.0, 1.0, 0.0));
camera-setViewport( new osg::Viewport(0, 0, width, height) );
camera-setProjectionMatrixAsPerspective(30.0f,
static_castdouble(width)/static_castdouble(height), 1.0f, 1.0f );
viewer.setCamera(camera);
osg::Group* rootnode = new osg::Group;
viewer.setSceneData(rootnode);
viewer.addEventHandler(new osgViewer::StatsHandler);
viewer.setUpViewInWindow(200, 200, width, height);
viewer.setCameraManipulator( new osgGA::TrackballManipulator );
std::vectorosg::Vec3 lines;
//Line 1
lines.push_back(osg::Vec3(-1,0,0));
lines.push_back(osg::Vec3(0,1,0));
//Line 2
lines.push_back(osg::Vec3(0,1,0));
lines.push_back(osg::Vec3(1,0,0));
//Line 3
lines.push_back(osg::Vec3(1,0,0));
lines.push_back( osg::Vec3(-1,0,0));
for(int i = 0; i 3; i++){
//osg::ref_ptrosg::Group parent = new osg::Group;
osg::ref_ptrosg::OcclusionQueryNode parent = new
osg::OcclusionQueryNode;
parent-setVisibilityThreshold(1);
parent-setQueriesEnabled(true);
osg::Geometry* linesGeom = new osg::Geometry();
osg::Vec3Array* vertices = new osg::Vec3Array;
vertices-push_back(lines.at(i+i));
vertices-push_back(lines.at(i+i+1));
osg::Vec4Array* color = new osg::Vec4Array;
color-push_back(osg::Vec4(1,0,0,1));
linesGeom-setColorArray(color);
linesGeom-setColorBinding(osg::Geometry::BIND_OVERALL);
linesGeom-setVertexArray(vertices);
linesGeom-addPrimitiveSet(new
osg::DrawArrays(osg::PrimitiveSet::LINES,0,2));
osg::Geode* geode = new osg::Geode();
geode-addDrawable(linesGeom);
parent-addChild(geode);
rootnode-addChild(parent);
}
return viewer.run();
}
Cheers,
Dakota
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