Hi,
Thank you all for comments so far!
I did'n specify a source for fog coordinates.
Adding the following made no difference:
fog->setFogCoordinateSource(osg::Fog::FRAGMENT_DEPTH);
I also added the following to be sure, no luck...
state->setMode(GL_DEPTH_TEST,osg::StateAttribute::ON);
state->setMode(GL_FOG, osg::StateAttribute::ON);
The starnge thing is tha (linear) fog works fine when I do
fog->setStart(-200.f); fog->setEnd(-300.f);
But NOT when I do:
fog->setStart(200.f); fog->setEnd(300.f);
Recap: current settings:
StateSet *state= world->getOrCreateStateSet();
state->setMode(GL_DEPTH_TEST,osg::StateAttribute::ON);
state->setMode(GL_FOG, osg::StateAttribute::ON);
fog->setColor(Vec4(1.,0.,0., 1.)); // Red fog for testing
fog->setDensity(0.);
fog->setMode(Fog::LINEAR);
fog->setStart(200.f); fog->setEnd(300.f); // Does not work
fog->setStart(-200.f); fog->setEnd(-300.f); // Works
fog->setFogCoordinateSource(osg::Fog::FRAGMENT_DEPTH);
state->setAttributeAndModes(fog,StateAttribute::ON);
Another thing: I found that all my osg-apps, including osgviewer, give a
warning after starting:
"detected OpenGL error 'invalid enumerant' after RenderBin::draw(,)"
Comes from RenderStage::drawInner() in
src/osgUtil/RenderStage.cpp:728...
I will check on another computer (at home) if same it has the same
warning / problem
I'm running out of ideas... Any clues are apreciated,
Hans
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf
> Of Vican, Justin E.
> Sent: dinsdag 13 november 2007 15:43
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Problem with osg::Fog
>
> Hi Hans,
> Which fog coordinates are you using (i.e.
> osg::Fog::FOG_COORDINATE -or- osg::Fog::FRAGMENT_DEPTH)? The
> following snippet has worked for me.
>
> osg::Fog* fog(new osg::Fog());
> fog->setMode(osg::Fog::LINEAR);
> fog->setFogCoordinateSource(osg::Fog::FRAGMENT_DEPTH);
> fog->setDensity(0);
> fog->setStart(10);
> fog->setEnd(100);
> fog->setColor(osg::Vec4(0.5, 0.5, 0.5, 0.5));
>
> ...
>
> rootNode->getOrCreateStateSet()->setAttributeAndModes(fog,
> osg::StateAttribute::ON);
>
> Hope This Helps,
> Justin
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of J.P.
> Delport
> Sent: Tuesday, November 13, 2007 5:22 AM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Problem with osg::Fog
>
> Hi,
>
> below is 'n snippet that I use that works. Only diff seems the call to
> gstate->setMode(GL_FOG, osg::StateAttribute::ON);
>
> cheers
> jp
>
> ---8<---
> // Fog
> //float fog_density = 9.85e-5;
> float fog_density = g_config->getDouble("fog", "density", 0.0);
> osg::Vec4d fog_colour = g_config->getVec4("fog",
> "colour", osg::Vec4( 0.5, 0.5, 0.5, 0.0));
> osg::Fog* fog = new osg::Fog();
> fog->setMode(osg::Fog::EXP);
> fog->setColor(fog_colour);
> fog->setDensity(fog_density);
> gstate->setMode(GL_FOG, osg::StateAttribute::ON);
> gstate->setAttribute(fog,osg::StateAttribute::ON);
>
> ---8<---
>
>
> Elbers, H.P. wrote:
> > Hi Robert,
> >
> > Thank you for responding. I've been experimenting for
> hours, with the
> > 'opengl programming guide' on my desk, but no luck.
> >
> > In my small test program the initial view distance to the
> centre of my
> > scene is about 250.
> >
> > I would expect the following to work but is does NOT:
> > fog->setMode(Fog::LINEAR);
> > fog->setStart(200.f); fog->setEnd(300.f);
> >
> > The fog looks 'ok' on my example when I use negative
> start/end values
> > (but I dont understand why it works):
> > fog->setMode(Fog::LINEAR);
> > fog->setStart(-200.f);
> >
> > For the exponential mode I would expect this to work, but
> it does not
> > (nor does any other density)
> > fog->setMode(Fog::EXP);
> > fog->setDensity(.00277); // e^(-250. * .00277) = .5
> >
> > Any clue? any hint? A simple working example (code or osg-file)?
> > anybody?
> >
> > Thanks,
> > Hans,
> >
> >> Hi Hans,
> >>
> >> Fog most likely will be working correctly, just the values
> involved
> >> need tweaking. The best thing to do is read up on OpenGL Fog
> >> settings, the OSG just passes the settings it has on to OpenGL.
> >> osg::Fog is effectively glFog, all the variable and naming
> >> conventions are the same.
> >>
> >> Robert.
> >>
> >> On Nov 12, 2007 12:25 PM, Elbers, H.P. <[EMAIL PROTECTED]>
> wrote:
> >>>
> >>> Hello All,
> >>>
> >>> I'm new to osg, and trying to use Fog...
> >>>
> >>> I get no fog at all, unless I use LINEAR mode with negative
> >> start and
> >>> end values, wich I find strange: I would expect that
> >> positive values
> >>> are required. If I try EXP mode, I cannot get any fog at al.
> >>>
> >>> Am I overlooking something obvious?
> >>> Please help!
> >>>
> >>> Hans Elbers
> >>>
> >>> ==========================================================
> >>> I'm using OSG 2.2 on linux, installed in a default way.
> >>> Here is a small test example (with red fog):
> >>>
> >>> I compile like this:
> >>> g++ -c -g main.cpp -o main.o
> >>> g++ -o osgtest -g main.o -losg -losgViewer -losgSim
> >>>
> >>> main.cpp:
> >>> ==========================================================
> >>> #include <osg/Group>
> >>> #include <osg/Fog>
> >>> #include <osgDB/ReadFile>
> >>> #include <osg/MatrixTransform>
> >>> #include <osg/PositionAttitudeTransform> #include
> >> <osgViewer/Viewer>
> >>> #include <osgGA/TrackballManipulator>
> >>>
> >>> using namespace osg;
> >>> using namespace std;
> >>>
> >>> int main(int argc, char *argv[]) {
> >>> osgViewer::Viewer viewer;
> >>> Group *world = new Group();
> >>>
> >>> StateSet *state= world->getOrCreateStateSet();
> >>>
> >>> Fog *fog =
> >> dynamic_cast<Fog*>(state->getAttribute(StateAttribute::FOG));
> >>> if (!fog) fog = new Fog;
> >>> fog->setColor(osg::Vec4(1.,0.,0., 1.));
> >>> fog->setDensity(0.15f);
> >>>
> >>> // ====> FOG works !?!?!
> >>> fog->setMode(Fog::LINEAR); fog->setStart(-200.f);
> >>> fog->setEnd(-300.f);
> >>>
> >>> // ====> NO FOG !?!?!?
> >>> //fog->setMode(Fog::LINEAR); fog->setStart(200.f);
> >> fog->setEnd(300.f);
> >>> //fog->setMode(Fog::EXP); fog->setStart(200.f);
> >> fog->setEnd(300.f);
> >>> state->setAttributeAndModes(fog,StateAttribute::ON);
> >>>
> >>> Node *obj = osgDB::readNodeFile("obj.osg");
> >>> if (obj) for (int i=-5; i<=5; i++) for (int j=-5; j<=5; j++) {
> >>> PositionAttitudeTransform *T = new
> PositionAttitudeTransform();
> >>> world->addChild(T);
> >>> T->setPosition(Vec3(10.*i, 10.*j, 0.));
> >>> T->addChild(obj);
> >>> }
> >>>
> >>> viewer.setSceneData(world);
> >>> osgGA::TrackballManipulator *manip = new
> >> osgGA::TrackballManipulator();
> >>> viewer.setCameraManipulator(manip);
> >>> viewer.realize();
> >>>
> >>> viewer.run();
> >>> }
> >>> ==========================================================
> >>>
> >>>
> >>> obj.osg contains a small cube:
> >>> ==========================================================
> >>> Group {
> >>> UniqueID Group_0
> >>> DataVariance UNSPECIFIED
> >>> name "root"
> >>> nodeMask 0xffffffff
> >>> cullingActive TRUE
> >>> num_children 1
> >>> Geode {
> >>> UniqueID Geode_7
> >>> DataVariance UNSPECIFIED
> >>> name "geode19"
> >>> nodeMask 0xffffffff
> >>> cullingActive TRUE
> >>> num_drawables 1
> >>> ShapeDrawable {
> >>> UniqueID ShapeDrawable_8
> >>> DataVariance UNSPECIFIED
> >>> Box {
> >>> DataVariance UNSPECIFIED
> >>> Center 0 0 0
> >>> HalfLengths .5 .5 .5
> >>> Rotation 0 0 0 1
> >>> }
> >>> useDisplayList FALSE
> >>> useVertexBufferObjects TRUE
> >>> color 1 1 1 1
> >>> }
> >>> }
> >>> }
> >>> ==========================================================
> >>> _______________________________________________
> >>> osg-users mailing list
> >>> [email protected]
> >>>
> >>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.
> >>> org
> >>>
> >>>
> >> _______________________________________________
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