Hal V. Engel wrote: > >I am not sure if the invisible tail is a flightgear problem, a problem with >the PC-7 model or if it is related to OpenGL or the nvidia drivers. What I >am seeing is that as I get closer to the aircraft ahead of me it's tail >starts to disappear and as I get even closer more of it will disappear until >it is totally gone. At one point I actually got in a position where all I >could see was the propeller and spinner which was kind of interesting since I >was behind the other aircraft. I would estimate that my apparent distance >from the closest part of the other PC-7 when this screen shot was taken to be >50 to 75 feet. Since the view is at a very wide angle things are much >closer than they appear. > >I tried some tests with objects on the ground such as the hanger and the two >static aircraft (IE. the 747 that sits on the ground at KSFO) and these did >not show the issue. Then I tried the C172 that is always located just off >the end of 28L (mpdummy) and it also did not show any signs of this issue. > > > Hi,
this is not a problem with the multiplayer aircrafts. You can see the same thing with your own aircraft. Change the view (v key), then adjust the view distance (with the dialog box). Your tail willl disapear, or your wing if you rotate the view. You did not witness this effect on the ground. I think that the code that computes the zbuffer range (http://www.sjbaker.org/steve/omniv/love_your_z_buffer.html) is outdated. The near clipping plane is set too far away and that's why the view is cut when in air. The problem is not visible when on ground because FG sets a 'better' Z-near value when under like 40 ft agl. Choosing values for the near/far clipping plane is not easy because this can lead to lots of visual artifacts. But I think that we could enhance the rendering a bit by reducing both the znear and the zfar values, zfar is set to a big number today for no apparent reason (why have a zfar set to 120km when the visibility is set to 17km ?). Sorry for the technical rambling... HJ. ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
