Attached is a simple OSG example that, on Mac with nVidia card, seems to show
point geometry with the Point StateAttribute set causing other geometry to be
clipped. We did not see this on a Mac with an ATI card. This has been
reproduced on the OSG trunk, but has been seen on older versions as well.
The example has a ClipNode, and a Geode with a Point, Line, and Triangle. When
we set the Point attribute on the StateSet, the Triangle and Line don't appear.
When we skip setting the Point attribute, all three Geometry drawables appear.
If you build the example and run it with no arguments, the Point attribute is
not set. If you run with an argument (doesn't matter what it is), the Point
attribute is set.
Leaving out the ClipNode causes all the Geometry objects to show, whether or
not the Point is set.
We suspect the part of Point::apply() which handles some of the extensions.
Could there be a problem in the nVidia driver?
If someone with an nVidia card on a Mac could try this out and give us some
input, we would appreciate it.
Also, if it turns out to be an issue we would report to nVidia, could we report
it with an OSG example? In other words, does nVidia have the ability to build
OSG examples, and have you reported problems to them with OSG to demonstrate?
In our real app, we saw triangle geometry move when we set the point attribute.
That pushed it out of the clipping planes, sometimes partially. This example
only shows the triangle disappearing, but it may be moving. Any idea for why
these things (settings on point attribute and transform of triangle) might be
connected?
thanks,
andy
#include <osg/Geometry>
#include <osg/ClipNode>
#include <osg/Point>
#include <osg/Geode>
#include <osgViewer/Viewer>
int main(int argc, char *){
// GL_LINES
osg::ref_ptr<osg::Vec3Array> xAxis = new osg::Vec3Array;
xAxis->push_back( osg::Vec3( -10.f, 0.f, 0.0f) );
xAxis->push_back( osg::Vec3( 10.f, 0.f, 0.0f) );
osg::ref_ptr< osg::Vec4Array> xColor = new osg::Vec4Array;
xColor->push_back( osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f));
osg::ref_ptr<osg::Geometry> X = new osg::Geometry;
X->setVertexArray( xAxis.get() );
X->setColorArray( xColor.get() );
X->setColorBinding( osg::Geometry::BIND_OVERALL );
X->addPrimitiveSet( new osg::DrawArrays( GL_LINES,0 , 2 ) );
// GL_Triangles
osg::ref_ptr<osg::Vec3Array> tVertices = new osg::Vec3Array;
tVertices->push_back( osg::Vec3(0.0f, 0.0f, 0.0f) );
tVertices->push_back( osg::Vec3(10.0f, 0.0f, 0.0f) );
tVertices->push_back( osg::Vec3(10.0f, 10.0f,10.0f) );
osg::ref_ptr<osg::Vec4Array> tColor = new osg::Vec4Array;
tColor->push_back( osg::Vec4( 1.0f, 0.0f, 0.0f, 1.0f) );
osg::ref_ptr< osg::Geometry > tri = new osg::Geometry;
tri->setVertexArray( tVertices.get() );
tri->setColorArray( tColor.get() );
tri->setColorBinding( osg::Geometry::BIND_OVERALL );
tri->addPrimitiveSet( new osg::DrawArrays( GL_TRIANGLES, 0, 3 ) );
// GL_POINTS
osg::ref_ptr<osg::Geometry> geom(new osg::Geometry());
osg::ref_ptr<osg::StateSet> stateSet(geom->getOrCreateStateSet());
osg::ref_ptr<osg::Vec4Array> pColor = new osg::Vec4Array;
pColor->push_back( osg::Vec4( 0.0f, 1.0f, 0.0f, 1.0f) );
osg::ref_ptr<osg::Point> p(new osg::Point());
osg::ref_ptr<osg::Vec3Array> pVertices = new osg::Vec3Array;
for( float idx = 0.; idx < 10; idx = idx + 1.){
pVertices->push_back( osg::Vec3( idx, idx, idx ) );
}
geom->setColorArray( pColor.get() );
geom->setColorBinding( osg::Geometry::BIND_OVERALL );
geom->setVertexArray(pVertices.get());
int numVerts = pVertices->size();
geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, 7));
float ptSize = 20.f; // some large size
p->setSize(ptSize);
if (argc > 1){
// This seems to cause the triangle and line to disappear
stateSet->setAttributeAndModes(p.get(), osg::StateAttribute::ON);
}
osg::ref_ptr<osg::Geode>root = new osg::Geode;
root->addDrawable ( X.get() );
root->addDrawable( tri.get() );
root->addDrawable( geom.get() );
// This is needed
osg::ref_ptr<osg::ClipNode>clipper = new osg::ClipNode;
osg::BoundingBox bb(-5., -10., -10., 5., 5., 5.);
clipper->createClipBox(bb);
clipper->addChild(root);
osgViewer::Viewer viewer;
viewer.setLightingMode(osg::View::NO_LIGHT);
viewer.setSceneData( clipper.get() );
viewer.setUpViewInWindow(20, 20, 640, 480);
viewer.realize();
return viewer.run();
}
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