Improve simulation timing at low frame rates.

Increased kDefaultMaxDelta to 0.15.
Added a small bias to combat a truncation issue.

Sources/Plasma/PubUtilLib/plPhysX/plSimulationMgr.cpp

@@ -193,7 +193,7 @@ class ErrorStream : public NxUserOutputStream
 //
 /////////////////////////////////////////////////////////////////
 
-#define kDefaultMaxDelta    (0.1)         // if the step is greater than .1 seconds, clamp to that
+#define kDefaultMaxDelta    (0.15)        // if the step is greater than .15 seconds, clamp to that
 #define kDefaultStepSize    (1.f / 60.f)  // default simulation freqency is 60hz
 
 /////////////////////////////////////////////////////////////////
@@ -469,7 +469,7 @@ void plSimulationMgr::Advance(float delSecs)
     }
 
     // Perform as many whole substeps as possible saving the remainder in our accumulator.
-    int numSubSteps = (int)(fAccumulator / kDefaultStepSize);
+    int numSubSteps = (int)(fAccumulator / kDefaultStepSize + 0.000001f);
     float delta = numSubSteps * kDefaultStepSize;
     fAccumulator -= delta;