Sorry, hit send too soon, updated below... Thrall, Bryan wrote on Monday, February 04, 2008 12:21 PM: > Tobias Münch 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
