FGFS-4.1/OpenSceneGraph
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Basic shadow volume alogirthm implemented in example.

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This commit is contained in:
Robert Osfield
2006-11-30 16:30:24 +00:00
parent 808047ee1b
commit a9d18d01db
3 changed files with 130 additions and 48 deletions
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143
examples/osgshadow/osgshadow.cpp
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@@ -3,6 +3,9 @@
#include <osg/LightModel>
#include <osg/Depth>
#include <osg/BlendFunc>
#include <osg/Camera>
#include <osg/Stencil>
#include <osg/CullFace>
#include <osgProducer/Viewer>
@@ -141,11 +144,13 @@ int main(int argc, char** argv)
while (arguments.read("--directionalLight")) postionalLight = false;
bool addOccluderToScene = false;
while (arguments.read("addOccluderToScene")) addOccluderToScene = true;
while (arguments.read("--addOccluderToScene")) addOccluderToScene = true;
bool updateLightPosition = true;
while (arguments.read("--noUpdate")) updateLightPosition = false;
bool doShadow = true;
while (arguments.read("--noShadow")) doShadow = false;
// any option left unread are converted into errors to write out later.
arguments.reportRemainingOptionsAsUnrecognized();
@@ -210,11 +215,15 @@ int main(int argc, char** argv)
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
group->addChild(geode.get());
osg::StateSet* ss = geode->getOrCreateStateSet();
ss->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
}
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 ambient(0.2,0.2,0.2,1.0);
osg::Vec4 diffuse(0.8,0.8,0.8,1.0);
osg::Vec4 zero_colour(0.0,0.0,0.0,1.0);
// first group
@@ -234,51 +243,111 @@ int main(int argc, char** argv)
light1->setAmbient(ambient);
light1->setDiffuse(zero_colour);
light1->setPosition(lightpos);
ss1->setAttributeAndModes(light1, osg::StateAttribute::ON);
ss1->setAttributeAndModes(light1, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
ss1->setMode(GL_LIGHTING, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
}
// second group
{
// use a camera here just to implement a seperate post rendering stage.
osg::Camera* camera = new osg::Camera;
camera->setRenderOrder(osg::Camera::POST_RENDER);
camera->setClearMask(GL_STENCIL_BUFFER_BIT);
group->addChild(camera);
osg::Group* second_model_group = new osg::Group;
second_model_group->addChild(model.get());
group->addChild(second_model_group);
osg::StateSet* ss_camera = camera->getOrCreateStateSet();
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);
}
ss_camera->setAttribute(depth);
{
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::Geode> geode = new osg::Geode;
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
// switch off the writing to the color bit planes.
osg::ColorMask* colourMask = new osg::ColorMask;
colourMask->setMask(false,false,false,false);
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::INCR);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(0, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
ss_sv1->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
camera->addChild(geode.get());
}
if (true)
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
occluder->comptueShadowVolumeGeometry(lightpos, *shadowVolume);
geode->addDrawable(shadowVolume.get());
// switch off the writing to the color bit planes.
osg::ColorMask* colourMask = new osg::ColorMask;
colourMask->setMask(false,false,false,false);
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::ALWAYS,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::DECR);
osg::StateSet* ss_sv1 = geode->getOrCreateStateSet();
ss_sv1->setRenderBinDetails(1, "RenderBin");
ss_sv1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
ss_sv1->setAttribute(colourMask);
ss_sv1->setAttributeAndModes(new osg::CullFace(osg::CullFace::FRONT), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
camera->addChild(geode.get());
}
{
osg::Group* second_model_group = new osg::Group;
second_model_group->addChild(model.get());
osg::StateSet* ss1 = second_model_group->getOrCreateStateSet();
ss1->setRenderBinDetails(5, "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::StateAttribute::OVERRIDE);
// set up the stencil ops so that only operator on this mirrors stencil value.
osg::Stencil* stencil = new osg::Stencil;
stencil->setFunction(osg::Stencil::EQUAL,0,~0u);
stencil->setOperation(osg::Stencil::KEEP, osg::Stencil::KEEP, osg::Stencil::KEEP);
ss1->setAttributeAndModes(stencil,osg::StateAttribute::ON);
osg::BlendFunc* blend = new osg::BlendFunc;
blend->setFunction(osg::BlendFunc::ONE, osg::BlendFunc::ONE);
ss1->setAttributeAndModes(blend, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
ss1->setMode(GL_LIGHTING, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
camera->addChild(second_model_group);
}
}
}