FGFS-4.1/OpenSceneGraph
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Added dynamic updating of light position and multi-pass addition of ambient and diffuse lighting

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This commit is contained in:
Robert Osfield
2006-11-30 12:05:51 +00:00
parent f022f79436
commit 808047ee1b
1 changed files with 84 additions and 3 deletions
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87
examples/osgshadow/osgshadow.cpp
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@@ -1,5 +1,9 @@
#include <osg/ArgumentParser>
#include <osg/LightModel>
#include <osg/Depth>
#include <osg/BlendFunc>
#include <osgProducer/Viewer>
#include <osgShadow/OccluderGeometry>
@@ -141,6 +145,8 @@ int main(int argc, char** argv)
bool updateLightPosition = true;
bool doShadow = true;
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
@@ -165,7 +171,6 @@ int main(int argc, char** argv)
osg::BoundingBox bb = cbbv.getBoundingBox();
osg::ref_ptr<osg::Group> group = new osg::Group;
group->addChild(model.get());
// set up the occluder
osg::ref_ptr<osgShadow::OccluderGeometry> occluder = new osgShadow::OccluderGeometry;
@@ -191,16 +196,91 @@ int main(int argc, char** argv)
}
else
{
lightpos.set(0.5f,0.25f,-0.8f,0.0f);
lightpos.set(0.5f,0.25f,0.8f,0.0f);
}
osg::ref_ptr<osg::Light> light = new osg::Light;
if (!doShadow)
{
group->addChild(model.get());
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
group->addChild(geode.get());
}
else
{
osg::Vec4 ambient(0.5,0.5,0.5,1.0);
osg::Vec4 diffuse(1.0,1.0,1.0,1.0);
osg::Vec4 zero_colour(0.0,0.0,0.0,1.0);
// first group
{
osg::Group* first_model_group = new osg::Group;
first_model_group->addChild(model.get());
group->addChild(first_model_group);
osg::StateSet* ss1 = first_model_group->getOrCreateStateSet();
osg::LightModel* lm1 = new osg::LightModel;
lm1->setAmbientIntensity(ambient);
ss1->setAttribute(lm1);
osg::Light* light1 = new osg::Light;
light1->setAmbient(ambient);
light1->setDiffuse(zero_colour);
light1->setPosition(lightpos);
ss1->setAttributeAndModes(light1, osg::StateAttribute::ON);
}
// second group
{
osg::Group* second_model_group = new osg::Group;
second_model_group->addChild(model.get());
group->addChild(second_model_group);
osg::StateSet* ss1 = second_model_group->getOrCreateStateSet();
ss1->setRenderBinDetails(1, "RenderBin");
osg::LightModel* lm1 = new osg::LightModel;
lm1->setAmbientIntensity(zero_colour);
ss1->setAttribute(lm1);
osg::LightSource* lightsource = new osg::LightSource;
lightsource->setLight(light.get());
light->setAmbient(zero_colour);
light->setDiffuse(diffuse);
light->setPosition(lightpos);
second_model_group->addChild(lightsource);
ss1->setMode(GL_LIGHT0, osg::StateAttribute::ON);
osg::Depth* depth = new osg::Depth;
depth->setWriteMask(false);
depth->setFunction(osg::Depth::LEQUAL);
ss1->setAttribute(depth);
osg::BlendFunc* blend = new osg::BlendFunc;
blend->setFunction(osg::BlendFunc::ONE, osg::BlendFunc::ONE);
ss1->setAttributeAndModes(blend, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
}
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
group->addChild(geode.get());
}
}
viewer.setSceneData(group.get());
@@ -222,8 +302,9 @@ int main(int argc, char** argv)
}
else
{
lightpos.set(sinf(t),cosf(t),-0.8f,0.0f);
lightpos.set(sinf(t),cosf(t),0.8f,0.0f);
}
light->setPosition(lightpos);
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
}