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
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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:
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#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();
}
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obj.osg contains a small cube:
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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
}
}
}
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