"Frederic Bouvier" writes
Norman Vine wrote:
> Frederic Bouvier writes:
> >
> > FG is not using the latest features new cards are offering and the 'old'
> > features are pretty maxed out now. This is not an explanation for
> > worst performance but just for lack of improvement. In the meantime,
> > you probably switched to another setup/resolution that can eat computing
> > power on your back.
>
> Implying that the underlying rendering library is the cause for 'lack of
> improvement' is a little harsh given the *many* changes since the
> last relese that have little to do with rendering :-)
I was not speaking about the underlying library at this point. It could also be our use of it, or the use of it by the model loaders. Otherwise, how could you explain the variations in framerate whether the buildings and the bridges are in view or not. Just as an example, it is not possible to share a set of vertices and vertices attributes between 2 graphic primitives. Indexed arrays are there but are never used, and if they would, the same vertex used by 2 adjacents primitives would have to be pushed twice. I didn't experienced myself what could be the gain yet, but I don't see a potential loss. And all this static data could reside in card memory instead of being sent to the bus every frame.
> Has anyone profiled FGFS recently ?
That is certainly needed. I was very disappointed myself to see that switching from GF3 to GF5900 didn't improve my framerate. I got a small improvement when I upgraded my CPU.
There is another point with graphic cards. On windows, their drivers can switch on several features that are not managed by the application. FSAA and anisotropic filtering come to mind. Unexperienced users can have them to their max ( just because these are default values ) with a significant impact on framerate.
It is just weird that in Innis case, things are getting worse. FX5200 are not top end cards but ATI 9800pro are. Something in the setup of these machines must be wrong.
It is quite possible that the new graphics card/system is not set up for FG.I will have a play with it and see if I can improve the situation.I think anisotropic filtering is on. The point I was trying to make is people trying FG for the first time will be dissuaded from using it because of the poor performance. As you yourself said it is disappointing to spend money on upgrading only to find that the sim runs at the same speed if not slower. With the price of computer hardware getting cheaper all the time I would think most people who are going to use FG would have reasonably new hardware.
You asked what the alpha window was.It is a window that pops up if you are using a JSBSIM FDM. Just says ALPHA and then the rest of sim loads. Well on the version I downloaded yesterday this window did not flash by instead I got a window saying "bad comand or file name" but then the sim continued to load normally. I will look into these things and see if I can find anything out.
-Fred
Cheers Innis
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