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From Ulrich Hertlein, "I've added a command line switch '--testOcclusion' that enables display of other models in

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front and behind the outlined object."
This commit is contained in:
Robert Osfield
2010-09-17 11:20:11 +00:00
parent d74ffd57aa
commit 7cc2d90725
1 changed files with 51 additions and 8 deletions
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59
examples/osgoutline/osgoutline.cpp
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@@ -5,6 +5,7 @@
*/
#include <osg/Group>
#include <osg/PositionAttitudeTransform>
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
@@ -16,19 +17,61 @@ int main(int argc, char** argv)
{
osg::ArgumentParser arguments(&argc,argv);
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] <file>");
arguments.getApplicationUsage()->addCommandLineOption("--testOcclusion","Test occlusion by other objects");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
// create outline effect
osg::ref_ptr<osgFX::Outline> outline = new osgFX::Outline;
outline->setWidth(8);
outline->setColor(osg::Vec4(1,1,0,1));
bool testOcclusion = false;
while (arguments.read("--testOcclusion")) { testOcclusion = true; }
// load outlined object
std::string modelFilename = arguments.argc() > 1 ? arguments[1] : "dumptruck.osg";
osg::ref_ptr<osg::Node> outlineModel = osgDB::readNodeFile(modelFilename);
if (!outlineModel)
{
osg::notify(osg::FATAL) << "Unable to load model '" << modelFilename << "'\n";
return -1;
}
// create scene
osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild(outline.get());
osg::ref_ptr<osg::Node> model0 = osgDB::readNodeFile(arguments.argc() > 1 ? arguments[1] : "al.obj");
outline->addChild(model0.get());
{
// create outline effect
osg::ref_ptr<osgFX::Outline> outline = new osgFX::Outline;
root->addChild(outline.get());
outline->setWidth(8);
outline->setColor(osg::Vec4(1,1,0,1));
outline->addChild(outlineModel.get());
}
if (testOcclusion)
{
// load occluder
std::string occludedModelFilename = "cow.osg";
osg::ref_ptr<osg::Node> occludedModel = osgDB::readNodeFile(occludedModelFilename);
if (!occludedModel)
{
osg::notify(osg::FATAL) << "Unable to load model '" << occludedModelFilename << "'\n";
return -1;
}
// occluder offset
const osg::BoundingSphere& bsphere = outlineModel->getBound();
const osg::Vec3 occluderOffset = osg::Vec3(0,1,0) * bsphere.radius() * 1.2f;
// occluder behind outlined model
osg::ref_ptr<osg::PositionAttitudeTransform> modelTransform0 = new osg::PositionAttitudeTransform;
modelTransform0->setPosition(bsphere.center() + occluderOffset);
modelTransform0->addChild(occludedModel.get());
root->addChild(modelTransform0.get());
// occluder in front of outlined model
osg::ref_ptr<osg::PositionAttitudeTransform> modelTransform1 = new osg::PositionAttitudeTransform;
modelTransform1->setPosition(bsphere.center() - occluderOffset);
modelTransform1->addChild(occludedModel.get());
root->addChild(modelTransform1.get());
}
// must have stencil buffer...
osg::DisplaySettings::instance()->setMinimumNumStencilBits(1);