hot to slowly rotate one object towards another

I would like to rotate(aim) one object at another. I don't want to use pointentity because its instant and I want it to be more gradual. Can anyone point me in the right direction? any help would be much appreciated

Function FaceEntity(Source,Target,Rotation_smoothnes#=10)
If rotdone=False
entang#=DeltaYaw#(Source,Target)
If Abs(entang#)>Rotation_smoothnes
TurnEntity Source,0,Rotation_smoothnes*Sgn(entang#),0
Else
xdiff# = EntityX(Source)-EntityX(Target)
ydiff# = EntityY(Source)-EntityY(Target)
zdiff# = EntityZ(Source)-EntityZ(Target)
dist#=Sqr#((xdiff#*xdiff#)+(zdiff#*zdiff#))
pitch# = ATan2(ydiff#,dist#)
yaw# = ATan2(xdiff#,-zdiff#)
RotateEntity Source,0,yaw#,0
rotdone=True
EndIf
End If

End Function

This will rotate your entity only around Y axis, but for X axis just use pitch# if you need it..

Function EntityPoint( Source , Target, MaxYawSpeed# , MaxPitchSpeed# )

  DY# = deltayaw( Source, Target )
  if abs( DY ) > MaxYawSpeed DY# = sgn( DY ) * MaxYawSpeed
  
  DP# = deltapitch( Source, Target )
  if abs( DP ) > MaxPitchSpeed DP = sgn( DP ) * MaxPitchSpeed

  turnentity Source, DP , DY , 0

end function

Thanks guys!