Won't this also remove the scale? -John
On Mon, 4 Feb 2008, Thrall, Bryan wrote: > > Sorry, hit send too soon, updated below... > > Thrall, Bryan wrote on Monday, February 04, 2008 12:21 PM: >> Tobias M?nch wrote on Monday, February 04, 2008 11:29 AM: >>> Hello at all, >>> >>> I have osg::Matrixd view matrix and want to remove the rotation >>> around x- and y-axis. Only rotation around z-axis should stay in the >>> matrix. I try a lot of possibilties but couldn't find a solution. >>> >>> When I make the following steps, the rotation around all axis is >>> removed, not only the two specified axis. The same with >>> osg::Matrixd::makeRotate(..); >>> >>> matrix = osg::Matrixd::rotate(osg::DegreesToRadians(0.0), >>> osg::Vec3(0,1,0)); >>> >>> matrix = osg::Matrixd::rotate(osg::DegreesToRadians(0.0), >>> osg::Vec3(1,0,0)); >>> >>> >>> I also tried to set the matrix with complete new values and to take >>> given value for z-rotation, but therefore I miss a function to read >>> the one rotation part (around the z-axis). >>> >>> How can help me? >> >> Both of those lines *set* matrix to a non-rotating matrix; what you >> want is to *modify* the matrix to remove the X and Y rotations. >> >> The easiest way is to modify the matrix directly: >> > > matrix(0,0) = 1; > matrix(0,1) = 0; > matrix(0,2) = 0; > matrix(1,0) = 0; > matrix(1,1) = 1; > matrix(1,2) = 0; > > If I didn't mess up my indices, this zeroes out the X and Y rotations while > leaving the Z intact. > > HTH, > -- > Bryan Thrall > FlightSafety International > [EMAIL PROTECTED] > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
