Hi, I'm trying to implement VR application where head tracking will be used to create the 3D illusion by changing the perspective in 3D scene.
The idea is very similar to the one implemented by Johny Lee in his 'Head Tracking for Desktop VR Displays' project using WiiRemote. The head tracking part works fine, I have got the 3D point corresponding to my head's position, the problem is when I move my head in horizontal or vertical direction it behaves ok, apart from the fact that objects - in my case cubes, are stretched in the z-axis. Secondly when I move my head in the z-axis in other words - closer to and further away from the screen I can see the back wall of my virtual room moves but the objects seem to be fixed and they do not change in size at all when I get closer to the screen. Below are 3 images: First one, head is in the original position. [Image: http://obrazki.elektroda.pl/6286372200_1333477477_thumb.jpg ] (http://obrazki.elektroda.pl/6286372200_1333477477.png) Second one, I moved my head right so I can see more of the left side of the room. [Image: http://obrazki.elektroda.pl/6130984900_1333477478_thumb.jpg ] (http://obrazki.elektroda.pl/6130984900_1333477478.png) Third one, I moved closer to the screen, but objects did not change their sizes but the back wall is closer now. [Image: http://obrazki.elektroda.pl/1229996500_1333477477_thumb.jpg ] (http://obrazki.elektroda.pl/1229996500_1333477477.png) I'm using the following code to render my scene: Code: ... float nearPlane = 0.0f; float farPlane = 20.0f; mOsgViewer.getCamera()->setProjectionMatrixAsFrustum( -0.5 + x, 0.5 + x, -0.5 + y, 0.5 + y, nearPlane - z, farPlane); osg::Matrixd cameraTrans; cameraTrans.makeTranslate(x, y, z); mOsgViewer.getCamera()->setViewMatrix(cameraTrans); mOsgViewer.frame(); ... I've created a widget in Qt which inherits from QGLWidget, to render my OSG scene. I added all cubes and room inside the constructor and in paintGL() I'm setting up glFrustum using the above code. I'm not using any camera manipulators. Is anyone familiar with VR displays. What should be the behaviour of a 3D scene rendered in such a way? I'm not sure if I'm doing this the right way. There are numerous projects using OpenGL and where glFrustum is set in the same way and then the head's movement is compensated with glTranslate. I will be very happy if someone could give me some hints as I think I'm doing something wrong. Thank you! Cheers, Chris Code: ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=46775#46775 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
