Re: [osg-users] Please mirro187, work on your communication

[mirr...@gmail.com]

Sorry, I don't have Internet in my work environment.Unable to provide 
complete test information

在2021年3月16日星期二 UTC+8 下午5:20:25 写道：

> Do you not wonder yourself, why hardy anyone answers to you?
>
> If you put a bit more work into your messages, then this might change
> quite a bit, because currently they're hard to understand at all.
>
> Most of the time you don't add any context to your problem, e.g. what
> you're trying to achieve from a high level point of view.
>
> Also how you write your messages isn't really reader friendly. Don't
> put your whole question into the subject line and only code into the
> message itself. Put only a very short summary into the subject line
> and then interleave the code example with explaining the problem you have
> with it. Also saying what you would have expected might help.
>
> You can't expect others to put work into solving your problems if you
> put almost no effort into it explaining them.
>
> Greetings,
> Daniel
>

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

[mirr...@gmail.com]

win10
// 
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 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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[osg-users] Please mirro187, work on your communication

[Daniel Trstenjak]

Do you not wonder yourself, why hardy anyone answers to you?

If you put a bit more work into your messages, then this might change
quite a bit, because currently they're hard to understand at all.

Most of the time you don't add any context to your problem, e.g. what
you're trying to achieve from a high level point of view.

Also how you write your messages isn't really reader friendly. Don't
put your whole question into the subject line and only code into the
message itself. Put only a very short summary into the subject line
and then interleave the code example with explaining the problem you have
with it. Also saying what you would have expected might help.

You can't expect others to put work into solving your problems if you
put almost no effort into it explaining them.

Greetings,
Daniel

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