---------- Initial Header ----------- >From : [EMAIL PROTECTED] To : "users" [email protected] Cc : Date : Fri, 25 Nov 2005 11:10:17 -0700 Subject : Re: [Opensg-users] CAVE HUGE PROBLEMS
> > Hi Antonio, > > On Fri, 2005-11-25 at 13:13 +0100, antonio_lioy wrote: > > Sorry for annoying once more. I'm sending pictures of my cave. > > As you can see in one of them there's little distorsion , while in the > > other the red line appears to be broken. > > What's the difference between the two pictures, i.e. what do you do to > get one or the other? The purpose of the two images is just to show that horizontal axis looks good, while the more the inclination of one axis with respect to the floor the more the distorsion. The second image shows the first one after a bit inclination with the navigator... As you can see the more the inclination, the more the distorsion.. Can this mean something?? > > > I realize that probably I'm doing something wrong with the navigation, > > cause I'm a bit confused with coordinate systems. > > Our tracking system has a local coordinate with origin in the center > > of our room and axis that are aligned to the CAVE walls. > > OK. > > > I used a perspective camera that is looking down Z axis position => > > (0,0,10). This camera has four ProjectionCameraDecorator (2 for each > > eye), and I'm passing the decorators the points of CAVE walls in > > tracking coordinates. > > The Camera doesn't really matter, only the beacon is used, the actual > projection is defined by the Decorators. > > > For navigation purposes I'm using a Navigator that acts on the beacon > > of our camera (the user Node of the decorator is initialized to > > identity matrix). > > OK. > > > What I don't understand at the moment is: what is the relation > > between the coordinate system of my tracking system and the > > coordinate systems that OpenSG uses to draw on the screens? I think I > > should think to project the coord system in my cave on the two walls, > > as if the projection plane were the wall of my cave... Uhm, there's > > something wrong but I don't know what it is. > > All that depends on where the head is. Unless the head is exactly in the > origin, you will never see the coordinate axes projected straight onto > the walls. > Uhm, OK. By the way when you say "origin", you mean that of the tracking system, don't you? > Where do you put the matrix that you get from your tracker? You should > have a Node (the User of the Decorator) with a Transform core under your > navigation beacon, which contains the Matrix you get from the tracker, > plus some correction for the offset between tracker and ete position > (see my last mail). > We don't use the tracking system at the moment... (but we should use it soon). The User of the Decorator is set to Identity and doesn't change. We just use the navigator through navigation window to simulate movement of the camera. The navigator works on a global beacon, which is the father of the Decorator User node. > Hope it helps > > Dirk > > Thanks... But i really need more help. What are the coordinate systems involved? The tracker's one, but what about OpenSG? where should I think that OpenSG Axis are placed? This is not very clear... Thanks a lot > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click > _______________________________________________ > Opensg-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/opensg-users > ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_idv37&alloc_id865&op=click _______________________________________________ Opensg-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/opensg-users
