Harald JOHNSEN:

Harald JOHNSEN:

I did some profiling of the code and found a few interessant things. Some corrections are obvious like the one in the multiplayer code, the fps is no more divided by 2 or 3 when another plane is on screen.

Other things like collision detection and computation of agl can not really be optimized. I changed a few things in hitlist.cxx but this only give a very low increase of fps. The groundcache eats a lot of cpu but I think that the real way to do it is to use a real collision system like OPCODE or something like that.

And I added an option to disable the recording of replay data. It takes more cpu than we can think.

Changes
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- panel.cxx :
  moved the computation of the instruments diffuse color outside the texturelayer code
  since this is constant during a frame, this is a big speedup for 2D panels ;

- hitlist.cxx :
  changed the computation of the intersection between ray and triangle, optimized
  the sphere culling by using a normalized direction vector. This can give a
  35% speedup on the computation of elevation in some situations ;

- renderer.cxx, acmodel.cxx :
  call ssgDrawAndCull with plane scene graph in external or internal view,
  calling ssgDrawAndCull with the root scene graph was drawing other players plane
  a second time in multiplayer mode ;

- mplayer.cxx :
  removed the calls to ssgFlatten and ssgStripify because it was degenerating models,
  causing a massive drop in frame rate ;

- replay.cxx :
  added an option to disable the recording of the flight

- fgclouds.cxx :
  changed the path of cloudlayer properties to match preferences.xml ;
  set the altitude of clouds from scenarios to a more correct value if metar is not enabled ;