FGFS-4.1/OpenSceneGraph
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Added movement of the light source to test performance of update the shadow volumes

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This commit is contained in:
Robert Osfield
2006-11-30 10:29:03 +00:00
parent 1cd4089d8e
commit cdcbf3f9af
1 changed files with 56 additions and 18 deletions
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74
examples/osgshadow/osgshadow.cpp
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@@ -132,6 +132,15 @@ int main(int argc, char** argv)
return 1;
}
bool postionalLight = false;
while (arguments.read("--positionalLight")) postionalLight = true;
while (arguments.read("--directionalLight")) postionalLight = false;
bool addOccluderToScene = false;
while (arguments.read("addOccluderToScene")) addOccluderToScene = true;
bool updateLightPosition = true;
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
@@ -149,34 +158,49 @@ int main(int argc, char** argv)
osg::notify(osg::NOTICE)<<"No model loaded, please specify a model to load."<<std::endl;
return 1;
}
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
occluder->computeOccluderGeometry(model.get());
// get the bounds of the model.
ComputeBoundingBoxVisitor cbbv;
model->accept(cbbv);
cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
osg::BoundingBox bb = cbbv.getBoundingBox();
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(model.get());
//geode->addDrawable(occluder.get());
// set up the occluder
osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
occluder->computeOccluderGeometry(model.get());
cbbv.getPolytope(occluder->getBoundingPolytope(),0.001);
if (addOccluderToScene)
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->addDrawable(occluder.get());
group->addChild(geode.get());
}
osg::ref_ptr<osgShadow::ShadowVolumeGeometry> shadowVolume = new osgShadow::ShadowVolumeGeometry;
#if 1
// occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.xMin()+ bb.radius(), bb.yMin()+ bb.radius(), bb.zMax() + bb.radius() ,1.0f), *shadowVolume);
occluder->comptueShadowVolumeGeometry(osg::Vec4(bb.center().x(), bb.center().y(), bb.zMax() + bb.radius() ,1.0f), *shadowVolume);
#else
occluder->comptueShadowVolumeGeometry(osg::Vec4(0.5f,.25f,0.2f,0.0f), *shadowVolume);
#endif
geode->addDrawable(shadowVolume.get());
shadowVolume->setUseDisplayList(!updateLightPosition);
osg::Vec4 lightpos;
if (postionalLight)
{
lightpos.set(bb.center().x(), bb.center().y(), bb.zMax() + bb.radius() ,1.0f);
}
else
{
lightpos.set(0.5f,0.25f,-0.8f,0.0f);
}
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
group->addChild(geode.get());
}
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(model.get());
group->addChild(geode.get());
viewer.setSceneData(group.get());
@@ -189,6 +213,20 @@ int main(int argc, char** argv)
// wait for all cull and draw threads to complete.
viewer.sync();
if (updateLightPosition)
{
float t = viewer.getFrameStamp()->getReferenceTime();
if (postionalLight)
{
lightpos.set(bb.center().x()+sinf(t)*bb.radius(), bb.center().y() + cosf(t)*bb.radius(), bb.zMax() + bb.radius() ,1.0f);
}
else
{
lightpos.set(sinf(t),cosf(t),-0.8f,0.0f);
}
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
}
// update the scene by traversing it with the the update visitor which will
// call all node update callbacks and animations.
viewer.update();