John Kelso wrote on Monday, February 04, 2008 2:31 PM: > Won't this also remove the scale?
Yes, but only for the X and Y axes :) > 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. -- Bryan Thrall FlightSafety International [EMAIL PROTECTED] _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
