Re: [Flightgear-devel] Re: [Flightgear-cvslogs] CVS:

[Josh Babcock]

This has all got me thinking a bit.  This subject seems to come up quite 
a bit, and frankly I have found it a dificult problem too.  In addition, 
there are some related things that can get hard as well like placing the 
wheels right on the ground, and getting the landing gear elements for 
wingtips and other parts that can experience a ground strike positioned 
correctly.  Maybe what we need is the ability to place a visual cursor 
into the scene graph and slave it's position to a set of positional 
properties.  These could come from the FDM or a view definition (think 
how useful it would be to go into helicopter mode and see exactly where 
you put the poilot's head, or some other viewpoint).  The big win IMHO 
is the ability to see where the plane's cg is independant of the model.  
I know that there aren't coordinates for all these things just laying 
around in the property tree, but if the ability to see them is 
implemented, maybe the FDMs will start exporting these coordinates.  The 
big one is the cg position, which is already there.

Josh

Jon S Berndt wrote:

On Thu, 12 Feb 2004 19:50:48 -0000
 "Jim Wilson" <[EMAIL PROTECTED]> wrote:
You actually want to be very exact about matching the model to the 
FDM origin.


...


Jim (or someone ... *anyone*):

Could you summarize the argument taking place here? I seem to only be 
getting parts of it - I guess I didn't get the original question/comment.

Is there now a difference in the way that JSBSim and YASim match up 
the 3D model with the FDM? Have you had a chance to try out the new 
way that JSBSim provides position? Is there anything else we (JSBSim 
and/or FDM developers) need to do?

I would like to get an alpha B747 FDM I have been working on to work 
using the 3D model, but haven't really had time to work on this much. 
When I did try it out initially, it looked like the origin was wrong 
between the 3D model and the FDM.

Jon

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