Hi Dirk, ok i try again. I have a volumemodel of certain points which are shown on the screen with coordinates for example from -128 to 128 for XYZ. Then there is a "viewpoint" from which I look on this model. The viewpoint has at the beginning the same coordinates like the from-point in the Look-At definition.
Then i use the Navigator to rotate around the model or to zoom in or to change the at point. As long as I dont change at point or rotate an do just a zoom, everything is fine an i can just use the from-coordinates to set them for my viewpoint. The problem are the rotations and the move of the at-point because this changes not only the from coordinates but as well the up-vector and the at-point-coordinates. I need the viewpoint to send rays on the volumemodel. Since i use the navigator an do no model transformation my "viewpoint" needs to be recalculate instead. Now i need either a method how to recalculate my "viewpoint" with the from, at and up values or a method which does it for me this or another way. Hope this helps? Simon -------- Original-Nachricht -------- > Datum: Fri, 12 Oct 2007 08:28:03 -0500 > Von: Dirk Reiners <[EMAIL PROTECTED]> > An: [email protected] > Betreff: Re: [Opensg-users] How to get correct viewpoint from Look-At > > Hi Simon, > > Simon Beisel wrote: > > Hello everybody, i am currently working on my masters thesis and have > > some problems calculating the right viewpoint on a volumemodel which > > is implemented in OpenSG. > > > > For my Calculations i need the viewpoint on the volume. > > Can you define what that is? Is it the from point, the at point, or > (most likely) the point in the model that's in the middle of the screen > or under the mouse cursor? > > > the from-point is only the viewpoint as long as the at-point and the > > up-vector stay unchanged. After rotating for example it is no longer > > correct. > > Rotating how? Using a Navigator? > > > Is there a way to get directly the corresponding viewpoint or does it > > have to be computed manually? In the second case, how can I compute > > the viewpoint correct with the from, at and up values? > > > > I would really appreciate if someone could help me or even post a > > chunk of code which manages that problem. > > Let's try the other way around: what do you want to do, what do you need > the viewpoint for? There might be an easy way to do what you want, if we > knew what you want. ;) > > Dirk > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Opensg-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/opensg-users -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Opensg-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/opensg-users
