Jon S Berndt <[EMAIL PROTECTED]> said: > On Mon, 16 Dec 2002 15:30:31 -0000 > "Jim Wilson" <[EMAIL PROTECTED]> wrote: > > > >Yes and we already have that capability. What we don't > >have yet is a way to > >offset what the chase view is looking at, but that won't > >be a problem. > > So, being supplied with the Nose Ref Pt. lat/lon/alt won't > give you anything new? That would be purely for proper > viewing from the chase plane? (A worthy reason in itself).
Yes and no. It should greatly improve the situation as far as keeping the gear above the pavement in an external view. The other issue is the one I described before where it looks odd because the camera tracks the nose as it pitches up and down. That needs to be dealt with in the viewer code. > Another comment (sort of a question): I believe that the > pilot eyepoint supplied in the JSBSim config file is being > used for proper viewpoint positioning(?). Actually I didn't know that existed. Being the last one to rework the viewer code I'm sure we aren't using it. > I can't remember if this is true or not. IIRC, with LaRCSim, the > view was taken from the CG. In a sense we are getting it from the CG under JSBSim because that is where the position data is being derived from on your end. The current view code is simply looking at the position and orientation data coming from the FDM. Position is assumed to be a fixed position on the aircraft. It is not of course, except in the case of YASim (AFAIK). Other things are applied but they are all user input related (things like turning the pilots head with the mouse). > In something like a shuttle, or a 747, > you (the pilot) are still quite a ways above the pavement > when the main gear touches down, and as you rotate the > nose down to likewise place the nosegear on terra firma, > there is not only a rotation that occurs, but a > translation of the pilot eyepoint. The pilot's view is always kept in sync with the 3D model's rotation (we actually start with the same matrices). Except as I noted above, when the user turns the pilots head additional rotations for that are applied. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
