Hi,
I have stumble on what seems to be a bug. It seems that when using the same
coordinates for vertices with osg::PrimitiveSet::POINTS and
osg::PrimitiveSet::LINES or LINE_LOOP, those vertices don't show up at the same
place on the screen. They are indeed displayed one pixel off.
I have attatched some code that produces this result.
I'm using an ortho2D projection, I don't know if it's linked to the problem.
the resulting image :
(d'oh.. can't post it yet)
Thank you!
Cheers,
lwi
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=38338#38338
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/Material>
#include <osg/Vec3>
#include <osg/MatrixTransform>
#include <osg/Texture2D>
#include <osg/PolygonStipple>
#include <osg/TriangleFunctor>
#include <osg/io_utils>
#include <osg/Point>
#include <osg/LineWidth>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include <osg/Math>
#include <iostream>
osg::Geode* createGeode( osg::Vec3Array* vert, const osg::Vec4d& color, GLenum mode ) {
osg::Geometry* linesGeom = new osg::Geometry();
linesGeom->setVertexArray(vert);
osg::Vec4Array* colors = new osg::Vec4Array;
colors->push_back( color );
linesGeom->setColorArray( colors);
linesGeom->setColorBinding(osg::Geometry::BIND_OVERALL);
linesGeom->addPrimitiveSet(new osg::DrawArrays(mode, 0, 4));
linesGeom->getOrCreateStateSet()->setAttribute( new osg::Point( 1.0f ), osg::StateAttribute::ON );
osg::Geode* geode = new osg::Geode();
geode->addDrawable(linesGeom);
return geode;
}
int main(int, char **)
{
int width = 100;
int height = 100;
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 0;
traits->y = 0;
traits->width = width;
traits->height = height;
traits->windowDecoration = true;
//traits->samples=4;
traits->doubleBuffer = true;
// traits->sharedContext = 0;
traits->vsync = true;
traits->overrideRedirect = true;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits.get());
// create the model
osg::Group* root = new osg::Group;
osg::Vec3Array* va = new osg::Vec3Array(4);
(*va)[0].set( 10, 10, 0 );
(*va)[1].set( 20, 10, 0 );
(*va)[2].set( 20, 20, 0 );
(*va)[3].set( 10, 20, 0 );
root->addChild( createGeode( va, osg::Vec4d(1,0,0,1), osg::PrimitiveSet::POINTS ) );
root->addChild( createGeode( va, osg::Vec4d(1,1,1,1), osg::PrimitiveSet::LINE_LOOP ) );
osgViewer::Viewer viewer;
// add model to viewer.
viewer.setSceneData( root );
viewer.setUpViewInWindow(0,0,traits->width, traits->height);
osg::Camera* camera = viewer.getCamera();
camera->setGraphicsContext(gc.get());
camera->setProjectionMatrix( osg::Matrix::ortho2D( 0, traits->width, 0, traits->height ) );
camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
camera->setClearColor( osg::Vec4(0,0,0,1 ) );
camera->setViewMatrix(osg::Matrix::identity());
camera->setProjectionResizePolicy( osg::Camera::FIXED );
camera->setCullingMode( camera->getCullingMode() & ~osg::CullSettings::SMALL_FEATURE_CULLING ); // ~ == not bit
osg::Viewport* vp = camera->getViewport();
printf("vp: (%f, %f) .. (%f, %f)\n", vp->x(), vp->y(), vp->width(), vp->height());
vp->setViewport( 0,0,traits->width, traits->height );
osg::StateSet* sss = camera->getOrCreateStateSet();
sss->setMode(GL_DEPTH_TEST, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
sss->setMode(GL_LIGHTING, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
sss->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
viewer.realize();
// program loop:
while( !viewer.done() ) viewer.frame();
return 0;
}
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