Hi Mengyu, It's hard to say exactly why it's disappearing but my best guess would be the aliasing of a sub pixel sized object is resulting to appearing/disappearing.
The way I'd tackle it would be to render the object to a texutre wth the camera zoomed into to render the object at a large than pixel size. Then render an oversize quad with this texture on and let OpenGL mipmpa filtering of the texture handle the antialiasing for you. This would be a form of impostor/image based rendering. Another approach would be to scale the object so it's not subpixel in sized. Robert. On 5 July 2013 10:24, Mengyu Yuan <[email protected]> wrote: > Hi, > > I have an object in my scene far from my camera. So far away that I can only > see a single pixel on screen. And it is slowly approaching the camera. Now I > need the camera to constantly render that pixel in the first few seconds. > > The problem is: the pixel disappears once in a while. > > When the object gets closer (about two or three pixels), it doesn't disappear > again. > > I tried to adjust the znear/zfar of the camera manually, but it didn't work. > I tried to set the CullingMode to NO_CULLING, still didn't work. And I'm sure > the object didn't fly out of my view. > > The camera is a RTT camera, but I don't think it's the reason, because no > scaling is performed. > > So I don't know why it's happening. > > Help please? > > ... > > Thank you! > > Cheers, > Mengyu > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=55151#55151 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
