Hi Tom, thanks a lot for your answer!
Tom Pearce wrote: > > In the step where you're calculating m, it looks like you're applying the > rotation to the original matrix, which includes a translation already. > Yes, this is (perhap) what i want. I try to be less ambiguous: my scene is a small room with a table at the center. The table, how you can see in pics has 8 rods, The table is translated by (0, 0, -309) to be placed on the floor My goal is to rotate a rdd using the mouse wheel: when i pick & scroll up on a rod it should rotate the related rod by +angle (the variable rotation in code) on Y axis (-rotation if i scroll down). This is why (in my reasoning) i use the original matrix for rotate: i should not know how much rotated is the rod. The rod only need to be rotated on its Y axis, it should not be translated Tom Pearce wrote: > > I'm not sure why you say that the rotation and translation is formally right > - the final translation should be equal to the original translation if you're > rotating about a local axis, but it isn't. > I said "formally right" because reading the output it seems that the rod is positioned right, but i'm not sure of this, since visually the rod is bad positioned after the rotation. Sincerely, more time I spend on this issue, more I feel confused :-)) However, to understand better how rods have to work (for rotating) , look some seconds of the following video: http://www.youtube.com/watch?v=p06NT8M5cKU PS: excuse my archaic English! ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=35602#35602 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
