- floatified p_scroll.cpp

While testing this it became clear that with the higher precision of doubles it has to be avoided at all costs to compare an actor's z position with a value retrieved from ZatPoint to check if it is standing on a floor. There can be some minor variations, depending on what was done with this value. Added isAbove, isBelow and isAtZ checking methods to AActor which properly deal with the problem.

src/p_mobj.cpp

@@ -3597,7 +3597,8 @@ void AActor::Tick ()
 				}
 				DVector3 pos = PosRelative(sec);
 				height = sec->floorplane.ZatPoint (pos);
-				if (Z() > height)
+				double height2 = sec->floorplane.ZatPoint(this);
+				if (isAbove(height))
 				{
 					if (heightsec == NULL)
 					{