FGFS-4.1/OpenSceneGraph
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Added code to better compute the view frustum that is appropriate for a traversed

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subgraph.
This commit is contained in:
Robert Osfield
2007-05-15 17:04:57 +00:00
parent 881ba2ed2f
commit 1e0af35900
3 changed files with 88 additions and 7 deletions
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76
src/osgSim/OverlayNode.cpp
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@@ -11,6 +11,7 @@
* OpenSceneGraph Public License for more details.
*/
#include <osg/ComputeBoundsVisitor>
#include <osg/Texture2D>
#include <osg/CoordinateSystemNode>
#include <osg/TexEnv>
@@ -337,7 +338,7 @@ void OverlayNode::traverse_OBJECT_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeV
void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVisitor& nv)
{
osg::notify(osg::NOTICE)<<"OverlayNode::traverse() - VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY"<<std::endl;
// osg::notify(osg::NOTICE)<<"OverlayNode::traverse() - VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY"<<std::endl;
if (nv.getVisitorType() != osg::NodeVisitor::CULL_VISITOR)
@@ -355,9 +356,78 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
OverlayData& overlayData = getOverlayData(cv);
Group::traverse(nv);
if (_overlaySubgraph.valid())
{
// get the bounds of the model.
osg::ComputeBoundsVisitor cbbv(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN);
_overlaySubgraph->accept(cbbv);
Group::traverse(nv);
osg::notify(osg::NOTICE)<<" "<<&overlayData<<std::endl;
osg::Matrix pm = *(cv->getProjectionMatrix());
osgUtil::CullVisitor::value_type znear = cv->getCalculatedNearPlane();
osgUtil::CullVisitor::value_type zfar = cv->getCalculatedFarPlane();
// osg::notify(osg::NOTICE)<<" before znear ="<<znear<<"\t zfar ="<<zfar<<std::endl;
cv->computeNearPlane();
znear = cv->getCalculatedNearPlane();
zfar = cv->getCalculatedFarPlane();
// osg::notify(osg::NOTICE)<<" after znear ="<<znear<<"\t zfar ="<<zfar<<std::endl;
// osg::notify(osg::NOTICE)<<" before clamp pm="<<pm<<std::endl;
cv->clampProjectionMatrixImplementation(pm, znear,zfar);
// osg::notify(osg::NOTICE)<<" after clamp pm="<<pm<<std::endl;
osg::Matrix MVP = *(cv->getModelViewMatrix()) * pm;
osg::Matrix inverseMVP;
inverseMVP.invert(MVP);
// osg::notify(osg::NOTICE)<<" MVP="<<MVP<<std::endl;
// osg::notify(osg::NOTICE)<<" inverseMVP="<<inverseMVP<<std::endl;
typedef std::vector<osg::Vec3d> Corners;
Corners corners;
corners.push_back(osg::Vec3d(-1.0,-1.0,-1.0));
corners.push_back(osg::Vec3d(1.0,-1.0,-1.0));
corners.push_back(osg::Vec3d(1.0,1.0,-1.0));
corners.push_back(osg::Vec3d(-1.0,1.0,1.0));
corners.push_back(osg::Vec3d(-1.0,-1.0,1.0));
corners.push_back(osg::Vec3d(1.0,-1.0,1.0));
corners.push_back(osg::Vec3d(1.0,1.0,1.0));
corners.push_back(osg::Vec3d(-1.0,1.0,1.0));
osg::Vec3d center;
for(Corners::iterator itr = corners.begin();
itr != corners.end();
++itr)
{
*itr = *itr * inverseMVP;
center += *itr;
// osg::notify(osg::NOTICE)<<" corner ="<<*itr<<std::endl;
}
center /= 8.0;
double diagonal = (corners[0]-corners[7]).length();
osg::notify(osg::NOTICE)<<" center ="<<center<<" diagonal ="<<diagonal<<std::endl;
}
else
{
Group::traverse(nv);
}
// osg::notify(osg::NOTICE)<<" "<<&overlayData<<std::endl;
}
void OverlayNode::traverse_VIEW_DEPENDENT_WITH_PERSPECTIVE_OVERLAY(osg::NodeVisitor& nv)