X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FAIModel%2FAIMultiplayer.cxx;h=a9635c5f7b5541902035b8ee508cd6fbda54f294;hb=38226af24ec01e8f0a20d7fd73ef838a69f6ef25;hp=0652dfef73751daf52f67997d72028ef2e6ad916;hpb=6cd0e5aac4b70bc927ad6f3d705a894ba3ee71ba;p=flightgear.git

diff --git a/src/AIModel/AIMultiplayer.cxx b/src/AIModel/AIMultiplayer.cxx
index 0652dfef7..a9635c5f7 100644
--- a/src/AIModel/AIMultiplayer.cxx
+++ b/src/AIModel/AIMultiplayer.cxx
@@ -39,11 +39,11 @@ FGAIMultiplayer::FGAIMultiplayer() : FGAIBase(otMultiplayer) {
    mTimeOffsetSet = false;
    mAllowExtrapolation = true;
    mLagAdjustSystemSpeed = 10;
-
+   mLastTimestamp = 0;
    aip.getSceneGraph()->setNodeMask(~SG_NODEMASK_TERRAIN_BIT);
+   lastUpdateTime = 0;
 
-}
-
+} 
 
 FGAIMultiplayer::~FGAIMultiplayer() {
 }
@@ -417,8 +417,21 @@ void FGAIMultiplayer::update(double dt)
   
   // extract the position
   pos = SGGeod::fromCart(ecPos);
+  double recent_alt_ft = altitude_ft;
   altitude_ft = pos.getElevationFt();
 
+  // expose a valid vertical speed
+  if (lastUpdateTime != 0)
+  {
+      double dT = curtime - lastUpdateTime;
+      double Weighting=1;
+      if (dt < 1.0)
+          Weighting = dt;
+      // simple smoothing over 1 second
+      vs = (1.0-Weighting)*vs +  Weighting * (altitude_ft - recent_alt_ft) / dT * 60;
+  }
+  lastUpdateTime = curtime;
+
   // The quaternion rotating from the earth centered frame to the
   // horizontal local frame
   SGQuatf qEc2Hl = SGQuatf::fromLonLatRad((float)pos.getLongitudeRad(),