Ok.
Hello Dirk.
Since a week, I start becoming mad with strange values from the
IntersectAction::getNormal() method... It seem there is a bug, this
method does'nt return the normal of the Hit triandle, but a vector
which is the cross product of the ray direction and one once the edges
of the triangle.
I think the return value should be qvec instead of pvec, but I'm not
sure.. (see the above code)
Instead, I'm using this code wich is not optimized but wirks great, so
there should be a problem :
TriangleIterator it(act->getHitObject());
it.seek( act->getHitTriangle() );
Vec3f v1 = it.getPosition(1)-it.getPosition(0);
Vec3f v2 = it.getPosition(2)-it.getPosition(0);
Vec3f norm = v1.cross(v2);
norm.normalize();
So I think there is something.... or maybe we undersdant "Nomal" in a
different way.
Look at the code (OpenSG1.8-Dailybuild 20/06).
OSGLine.cpp
Raphaël Ducom.
00692 bool Line::intersect(const Pnt3f &v0,
00693 const Pnt3f &v1,
00694 const Pnt3f &v2,
00695 Real32 &t,
00696 Vec3f *norm) const
00697 {
00698 // Eps (1E-6f) didn't work with very small geometries!
00699 static const Real32 sEps = 1E-10f;
00700
00701 // find vectors for two edges sharing v0.
00702 Vec3f edge1 = v1 - v0;
00703 Vec3f edge2 = v2 - v0;
00704
00705 // begin calculating determinant - also used to calculate U parameter.
00706 Vec3f pvec = _dir.cross(edge2);
00707
00708 // if determinant is near zero, ray lies in plane of triangle.
00709 Real32 det = edge1.dot(pvec);
00710 Vec3f qvec;
00711
00712 if(det > sEps)
00713 {
00714 // calculate distance from v0 to ray origin.
00715 Vec3f tvec = _pos - v0;
00716
00717 // calculate U parameter and test bounds.
00718 Real32 u = tvec.dot(pvec);
00719
00720 if(u < 0.0 || u > det)
00721 return false;
00722
00723 // prepare to test V parameter.
00724 qvec = tvec.cross(edge1);
00725
00726 // calculate V parameter and test bounds.
00727 Real32 v = _dir.dot(qvec);
00728
00729 if(v < 0.0 || u + v > det)
00730 return false;
00731 }
00732 else if(det < -sEps)
00733 {
00734 // calculate distance from v0 to ray origin.
00735 Vec3f tvec = _pos - v0;
00736
00737 // calculate U parameter and test bounds.
00738 Real32 u = tvec.dot(pvec);
00739
00740 if(u > 0.0 || u < det)
00741 return false;
00742
00743 // prepare to test V parameter.
00744 qvec = tvec.cross(edge1);
00745
00746 // calculate V parameter and test bounds.
00747 Real32 v = _dir.dot(qvec);
00748
00749 if(v > 0.0 || u + v < det)
00750 return false;
00751 }
00752 else
00753 return false; // ray is parallel to the plane of the triangle.
00754
00755 Real32 inv_det = 1.0 / det;
00756
00757 // calculate t, ray intersects triangle.
00758 t = edge2.dot(qvec) * inv_det;
00759
00760 if(norm != NULL)
00761 *norm = pvec;
00762
00763 return true;
00764 }
2007/6/22, Dirk Reiners <[EMAIL PROTECTED]>:
>
> Dear Users,
>
> we're in the process of (finally!) finishing 1.8. it's feature-frozen and
> we're
> fixing the last bugs before release and diving full force in OpenSG 2. To do
> that we need some help from all of you, to make sure that things are working
> the
> way they're supposed to.
>
> The first part is of course to make sure that your code works with the current
> source base. So please download one of the current dailybuilds from
> http://www.opensg.org/dailybuild_logs and test it with your application. If
> you
> have any problems, please open a ticket on the Trac system at
> http://opensg.vrsource.org/trac/newticket (don't forgot to set the milestone
> to
> 1.8 Release and the version to 1.8).
>
> In addition to making sure that the code is working, we need to make sure that
> the distributions are working. So we would appreciate if you could download
> the
> distribution for your environment from the dailybuilds page, install it, and
> run
> a quick test if it works. That includes the installation itself, running the
> precompiled example programs, rebuilding the precompiled example programs, and
> rebuilding the actual OpenSG library from source on your platform. Especially
> the last part can take a while, so if you don't have time to do all of these,
> every single one would be helpful.
>
> If you do try one of these, please let us know if you had a problem (by
> opening
> a ticket), or if just worked. For the latter, please note that on the 1.8
> release planning page at
> http://opensg.vrsource.org/trac/wiki/Planning1_8release .
>
> I would like to get 1.8 out quickly, so please check if you find a little time
> for doing this over the next couple days. Every little bit helps!
>
> Thanks for your support and for making OpenSG the best it can be!
>
> Yours
>
> The OpenSG Team
>
>
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