Hi, I am trying to solve a problem we posted before here (http://forum.openscenegraph.org/viewtopic.php?p=47733#47733).
My application starts without touching the zoom level only setting the camera projection and view matrices (frustum and look-at position). My program then adds an 'x' made out of 2 lines to the scene, but the 'x' does not show until I zoom out and another object appears in the view. I am using orthographic projection, and zooming is done by adjusting the camera's frustum (right left top bottom) by a factor. Here is a picture (ignore the green cross-hair): [Image: http://img839.imageshack.us/img839/1662/disappearingobj.jpg ] (http://imageshack.us/photo/my-images/839/disappearingobj.jpg/) If I zoom in - it goes away ... zoom out, shows the moment the other object is in the view. If I play with the zoom for a while, eventually the 'x' does not go away anymore. I also tried it with another graphic object (not an 'x') to make sure it is not the lines of the 'x', but the problem shows also in the other objects. Things I tried to fix the problem (and did not work): - As to Paul Martz's suggestion - tried turning off AutoTransform. - Also tried Paul's second suggestion - debugging the projection and view matrices of our camera. I found out we were using a child class of TrackballManipulator, and that the projection and view matrices were modified by the manipulator in each frame call ... So I went and quickly wrote my own manipulator (inheriting from StandardManipulator). I looked at FirstPersonManipulator for help in implementing the get\set matrix\transformation methods. In my implementation, the graphics camera should be looking at the z = 0 plane at any time (perpendicular to the plane), and the position is somewhere above the z=0 plane (these values are set by the application).Debugged this, and I noticed something (not me) is also changing the right,left,bottom,top of the camera's frustum. I am OK with this since the view matrix (camera location and orientation) is correct and not changed between frames. But still I could not understand why I can't see the 'x'! - I thought the 'x' may be clipped out of the near\far of the frustum, so I tried setComputeNearFarMode(osg::CullSettings:O_NOT_COMPUTE_NEAR_FAR). Any help is appreciated Thank you! Ron[/img] ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48873#48873 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
