[osg-users] How do you create the osg::Planeof PolytopeIntersector that will give you the right intersection?

[mirr...@gmail.com]

        win10&osg3.6.4
        // 
        osg::Matrixd proj  = osg::Matrixd::identity();
proj.makePerspective(60, frustumAspectWidth/frustumAspectHeight, 
frustumNear, frustumFar);
//
const double mynear = proj(3, 2) / (proj(2, 2) - 1.0);
const double myfar = proj(3, 2) / (1.0 + proj(2, 2));
//
const double nLeft = mynear * (proj(2, 0) - 1.0) / proj(0, 0);
const double nRight = mynear * (1.0 + proj(2, 0)) / proj(0, 0);
const double nTop = mynear * (1.0 + proj(2, 1)) / proj(1, 1);
const double nBottom = mynear * (proj(2, 1) - 1.0) / proj(1, 1);
const double fLeft = myfar * (proj(2, 0) - 1.0) / proj(0, 0);
const double fRight = myfar * (1.0 + proj(2, 0)) / proj(0, 0);
const double fTop = myfar * (1.0 + proj(2, 1)) / proj(1, 1);
const double fBottom = myfar * (proj(2, 1) - 1.0) / proj(1, 1);
//
_projectPt[0] = osg::Vec3d(0.0, 0.0, 0.0);
_projectPt[1] = osg::Vec3d(nLeft, nBottom,  -mynear);
_projectPt[2] = osg::Vec3d(nRight, nBottom, -mynear);
_projectPt[3] = osg::Vec3d(nRight, nTop, -mynear);
_projectPt[4] = osg::Vec3d(nLeft, nTop,  -mynear);
_projectPt[5] = osg::Vec3d(fLeft, fBottom,  - myfar);
_projectPt[6] = osg::Vec3d(fRight, fBottom, - myfar);
_projectPt[7] = osg::Vec3d(fRight, fTop,  -myfar);
_projectPt[8] = osg::Vec3d(fLeft, fTop,  - myfar);
osg::Polytope viewFrstumPoly;
//
osg::Matrixd ViewM = _view->getCamera()->getInverseViewMatrix();
//
osg::Vec3d tempProjectPt[9];
//tempProjectPt[0] = _projectPt[0] * ViewM;
tempProjectPt[1] = _projectPt[1] * ViewM;
tempProjectPt[2] = _projectPt[2] * ViewM;
tempProjectPt[3] = _projectPt[3] * ViewM;
tempProjectPt[4] = _projectPt[4] * ViewM;
tempProjectPt[5] = _projectPt[5] * ViewM;
tempProjectPt[6] = _projectPt[6] * ViewM;
tempProjectPt[7] = _projectPt[7] * ViewM;
tempProjectPt[8] = _projectPt[8] * ViewM;
{
viewFrstumPoly.add(osg::Plane(tempProjectPt[1],tempProjectPt[5],tempProjectPt[8]));
}
{
viewFrstumPoly.add(osg::Plane(tempProjectPt[2],tempProjectPt[7],tempProjectPt[6]));
}

{
viewFrstumPoly.add(osg::Plane(tempProjectPt[3], 
tempProjectPt[4],tempProjectPt[8]));
}

{
viewFrstumPoly.add(osg::Plane(tempProjectPt[1],tempProjectPt[2],tempProjectPt[6]));
}
{
viewFrstumPoly.add(osg::Plane(tempProjectPt[5],tempProjectPt[6],tempProjectPt[7]));
}
{
viewFrstumPoly.add(osg::Plane(tempProjectPt[3],tempProjectPt[4],tempProjectPt[1]));
}
osg::ref_ptr<osgUtil::PolytopeIntersector> picker = new 
osgUtil::PolytopeIntersector(osgUtil::Intersector::MODEL, poly);
picker->setPrecisionHint(osgUtil::Intersector::USE_DOUBLE_CALCULATIONS);
picker->setPrimitiveMask(osgUtil::PolytopeIntersector::POINT_PRIMITIVES);
picker->setIntersectionLimit(osgUtil::Intersector::NO_LIMIT);
//
osgUtil::IntersectionVisitor iv(picker);
_videoFusionNode->accept(iv);//group of scene 
if (picker->containsIntersections())
{
//
}

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