Hi Paul, Thanks for your reply. I need only one explanation about that;
//////////////////////////////////////////////// psudo code Matrix model= identity; Matrix matrix1= identity; matrix1->rotate( 10 degree on LOCAL X axis ) matrix1->rotate( 10 degree on LOCAL Y axis ) matrix1->rotate( -10 degree on LOCAL X axis ) matrix1->rotate( -10 degree on LOCAL Y axis ) model->setMatrix( matrix1 ) matrix1 is NOT IDENTITY at last. ////////////////////////////////////////////////// Do you think it is impossible rotating due to 2 different LOCAL axis on same matrix? I have tried your suggestion but can't resolve; //////////////////////////////////////////////// psudo code Matrix model= identity; Matrix matrix1= identity; Matrix matrix2= identity; matrix1->rotate( 10 degree on LOCAL X axis ) model->setMatrix(matrix1 * matrix2); // Turned Local X axis 10 degree matrix2->rotate( 10 degree on LOCAL Y axis ) model->setMatrix(matrix1 * matrix2); // Turned Global Y axis 10 degree matrix1->rotate( -10 degree on LOCAL X axis ) model->setMatrix(matrix1 * matrix2); // Turned Local X axis -10 degree matrix2->rotate( -10 degree on LOCAL Y axis ) model->setMatrix(matrix1 * matrix2); // Turned Global Y axis -10 degree model is IDENTITY at last. ////////////////////////////////////////////////// As you said I hold different rotation Matrix for each Axis, but as you can see from above code some rotations done on LOCAL and some rotations done on GLOBAL axis. But I want to do all rotations on LOCAL axis without any artifacts. I know below formulation; /////////////////////////////////////////////////// m = rotation * m; // rotate around matrix axis (local space) m = m * rotation; // rotate around fixed axis (global space) /////////////////////////////////////////////////// But if I change " model->setMatrix(matrix1 * matrix2); " formulation for Y Axis to " model->setMatrix(matrix2 * matrix1); ", this time as a result some frame jumping occured on rotation operations. Do you think it is impossible to operate absolute matrix multiplication for 2 different Local axis on one model? If I operate incremental matrix multiplication for 2 different Local axis I can rotate my model pretty easy but this time I might not reach initial rotation state for this model although I rotate reverse direction for each axis but in different order. Am I trying to achieve impossible operation or not? Thanks so much. Regards. Ümit Uzun 30 Aralık 2009 23:48 tarihinde Paul Martz <pma...@skew-matrix.com> yazdı: > I would store the x and y rotations as separate variables. Use them to > compute a single Matrix when you need to update. Test for identity by > checking to see if your x and y variables fall within an epsilon range of > zero. > > Paul Martz > Skew Matrix Software LLC > _http://www.skew-matrix.com_ <http://www.skew-matrix.com/> > +1 303 859 9466 > > > > Ümit Uzun wrote: > >> Hi All, >> >> I have a problem about rotating one MatrixTransform node with 2 different >> Matrix which one of responsible for rotation on X by osg::X_AXIS and one of >> responsible for rotatin by osg::Y_AXIS. >> I have done some rotation to MT node but after this operations I am >> waiting to get Identity matrix for MT which has Identity matrix in initial >> state. >> Some psudo codes; >> >> ------------------------------------------------- >> // Initial states >> osg::MatrixTransform* MT; >> MT->setMatrix( osg::Matrix::identity() ); >> osg::Matrix ang1 = osg::Matrix::identity(); >> osg::Matrix ang2 = osg::Matrix::identity(); >> >> // Updates done with this codes >> ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f), >> osg::X_AXIS))); >> ang2.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f), >> osg::Y_AXIS))); >> >> MT->setMatrix(ang2 * ang1); >> ------------------------------------------------- >> >> if I rotate my MT by above code; model rotated on Y by localCoordinate >> axis and rotated on X fixedCoordinate axis. But I wanted to rotate on X >> local coordınate axis too. >> >> >> If I use one matrix to update rotation; >> ------------------------------------------------- >> // Initial states >> osg::MatrixTransform* MT; >> MT->setMatrix( osg::Matrix::identity() ); >> osg::Matrix ang1 = osg::Matrix::identity(); >> >> // Updates done with this codes >> ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f), >> osg::X_AXIS))); >> ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(10.0f), >> osg::Y_AXIS))); >> ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(-10.0f), >> osg::X_AXIS))); >> ang1.preMult(osg::Matrix::rotate(osg::Quat(osg::DegreesToRadians(-10.0f), >> osg::Y_AXIS))); >> >> MT->setMatrix(ang1); >> ------------------------------------------------- >> >> With above code I can rotate my model X and Y local coordinate axis. But >> this code has lack too. >> >> After apply positive and negative way rotation I am waiting to get >> IdentityMatrix but after all rotation operation my MT->getMatrix() give me >> different from IdentityMatrix. I think I should use inverse matrix instead >> of negative direction rotated matrix to rotate -X or -Y direction. Could it >> solve my problem or not? >> >> By these 2 rotation operations my main goal is that; I want to rotate MT >> by X and Y local coordinate system. And after all rotations I can get >> initial state of MT. I mean I apply to many rotation transformation to my >> unique node and after all dual(for X and -X or for y and -Y with unordered >> queue) operation I want to get first initial matrix for my MT node. >> >> I know this is not hard operations, but I am unstable about choosing which >> one is right way. >> I appreciate any comments. >> Regards. >> >> Ümit Uzun >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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