Hi Peter, What do you mean by a degenerated polytope of volume 0 ? That polytope definitely doesn't have a null volume since I've been using it to select objects in my application and it works.
The four planes all have the same starting point because I want the polytope to be a pyramid coming out from a user's hand, so the planes -should- all intersect at the summit, no ? Julien-Charles On Thu, Feb 4, 2010 at 8:35 AM, Peter Hrenka <[email protected]>wrote: > Hi Julien-Charles, > > Julien-Charles Lévesque schrieb: > >> [...] >> >> >> Here is my code... stripped down to a minimum. I assume that you have a >> 4x4 matrix containing orientation of your selector (lOrientation) and a vec3 >> containing it's position (lPosition). I built the polytope to point in the >> direction of positive y-axis. Sorry for the french variable names and >> comments here and there... I don't think they hurt readability much at this >> level :P >> >> However, I wasn't able to extract a reliable 3x3 rotation matrix from >> mouse coordinates. I can only say that this code works well with the raw 3x3 >> orientation and position provided by my tracker. Do you have any idea for a >> desktop variation ? I can implement it. I could also integrate all this in >> the examplekeyboardmouse, once I've figured out how to do it with a mouse :P >> > > You seem to use the same base-point for all but one > plane: > > lPlane.set(lNorm, lPosition); > > This will give you a degenerated polytope of > volume 0. > Try using > lPlane.set(lNorm, lPosition-radius*lNorm); > with some radius > 0 > > > > Cheers, > > Peter > -- > Vorstand/Board of Management: > Dr. Bernd Finkbeiner, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech > Vorsitzender des Aufsichtsrats/ > Chairman of the Supervisory Board: > Michel Lepert > Sitz/Registered Office: Tuebingen > Registergericht/Registration Court: Stuttgart > Registernummer/Commercial Register No.: HRB 382196 > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Julien-Charles
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