FGFS-4.1/OpenSceneGraph
4
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Experiments with modifying the projection matrix to provide keystoning.

Browse Source
This commit is contained in:
Robert Osfield 2013-03-15 17:35:43 +00:00
parent ab55668ff3
commit 890ecb6abb
1 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
examples/osgkeystone/osgkeystone.cpp
View File

@ -17,6 +17,8 @@
*/ */
#include <osg/Notify> #include <osg/Notify>
#include <osg/io_utils>
#include <osgDB/ReadFile> #include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator> #include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer> #include <osgViewer/Viewer>
@ -30,6 +32,18 @@ int main( int argc, char **argv )
// initialize the viewer. // initialize the viewer.
osgViewer::Viewer viewer(arguments); osgViewer::Viewer viewer(arguments);
osg::Vec2d translate(0.0,0.0);
osg::Vec2d scale(1.0,1.0);
osg::Vec2d taper(1.0,1.0);
double angle = 0; // osg::inDegrees(45.0);
if (arguments.read("-a",angle)) { OSG_NOTICE<<"angle = "<<angle<<std::endl; angle = osg::inDegrees(angle); }
if (arguments.read("-t",translate.x(), translate.y())) { OSG_NOTICE<<"translate = "<<translate<<std::endl;}
if (arguments.read("-s",scale.x(), scale.y())) { OSG_NOTICE<<"scale = "<<scale<<std::endl;}
if (arguments.read("-k",taper.x(), taper.y())) { OSG_NOTICE<<"taper = "<<taper<<std::endl;}
osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(arguments); osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(arguments);
if (!model) if (!model)
@ -42,5 +56,26 @@ int main( int argc, char **argv )
viewer.setCameraManipulator(new osgGA::TrackballManipulator()); viewer.setCameraManipulator(new osgGA::TrackballManipulator());
viewer.realize();
viewer.getCamera()->setComputeNearFarMode(osg::Camera::DO_NOT_COMPUTE_NEAR_FAR);
osg::Matrixd& pm = viewer.getCamera()->getProjectionMatrix();
pm.postMultRotate(osg::Quat(angle, osg::Vec3d(0.0,0.0,1.0)));
pm.postMultScale(osg::Vec3d(scale.x(),scale.y(),1.0));
pm.postMultTranslate(osg::Vec3d(translate.x(),translate.y(),0.0));
if (taper.x()!=1.0)
{
double x0 = (1.0+taper.x())/(1-taper.x());
OSG_NOTICE<<"x0 = "<<x0<<std::endl;
pm.postMult(osg::Matrixd(1.0-x0, 0.0, 0.0, 1.0,
0.0, 1.0-x0, 0.0, 0.0,
0.0, 0.0, (1.0-x0)*0.5, 0.0,
0.0, 0.0, 0.0, -x0));
}
return viewer.run(); return viewer.run();
} }