Hi, after sending that email, I thought that it was misleading :)
the problem is rotating around the local up-axis. I will try as you have suggested. Thanks, Keyan On 26 Aug 2011, at 16:06, Carsten Neumann wrote: > Hello Keyan, > > On 08/26/2011 06:10 AM, Keyan wrote: >> in my application, I am currently using the TrackballEngine, but I would >> like to extend it by a simple function. >> >> Let's say, it should be triggered by pressing SHIFT + LeftButton. >> >> What I want to have is the following. While holding down SHIFT + left mouse >> button, the navigator should rotate around it's up vector. Imagine a tripod >> mounted camera, where the cameraman only rotates the camera left and right, >> not up and down. >> >> I tried for a while now, but couldn't find a working solution. > > is the problem with using SHIFT + button to trigger the rotation or > computing the rotation itself? > In the latter case, do you want to rotate around the current (local) up > axis or one defined in world space? > For rotating around the local up axis you just multiply a rotation > around that axis onto the current matrix (_tMatrix for TrackballEngine). > For rotating around an axis defined in world space, multiply it by the > inverse of the current matrix (to bring it from world to local > coordinates) then rotate around that axis. > > Cheers, > Carsten > > ------------------------------------------------------------------------------ > EMC VNX: the world's simplest storage, starting under $10K > The only unified storage solution that offers unified management > Up to 160% more powerful than alternatives and 25% more efficient. > Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev > _______________________________________________ > Opensg-users mailing list > Opensg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/opensg-users ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
