Simplify lots of code in the launch sequence.

lib/navigation.ks

@@ -6,6 +6,18 @@ function GetPitch {
   return 90 - vectorangle(SHIP:UP:FOREVECTOR, v).
 }
 
+function GetAscentVector {
+  parameter minPitch.
+  // face prograde, but hold a solid eastern heading and don't
+  // rotate the ship
+  local newHeading is lookdirup(SHIP:SRFPROGRADE:FOREVECTOR,
+    heading(90, 0, 270):TOPVECTOR).
+  if GetPitch(newHeading:FOREVECTOR) < minPitch {
+    set newHeading to heading(90, minPitch, 270).
+  }
+  return newHeading.
+}
+
 function AddCircularizationNode {
   parameter usePeriapsis is false.
   local target is SHIP:ORBIT:APOAPSIS.

lib/throttle.ks

@@ -2,14 +2,7 @@
 @lazyglobal off.
 
 local G is 9.81.
-lock G to GetGravAcc().
-
-function GetGravAcc {
-  if HAS_GRAV_SENSOR = true {
-    return SHIP:SENSORS:GRAV:MAG.
-  }
-  return SHIP:BODY:MU / ((SHIP:BODY:RADIUS+SHIP:ALTITUDE)^2).
-}
+lock G to SHIP:BODY:MU / ((SHIP:BODY:RADIUS+SHIP:ALTITUDE)^2).
 
 // Returns the throttle value you should use to achieve the
 // target TWR. If TWR can't be achieved, returns 1.0. (full throttle)
@@ -27,22 +20,6 @@ function TWR {
   return t/(m*G).
 }
 
-// Check for various sensors and set appropriate global constants.
-// Currently only checks for grav sensor, as that's the only one used by this library.
-global HAS_GRAV_SENSOR is false.
-function SensorCheck {
-  local SensorList is 0.
-  list SENSORS in SensorList.
-  for s in SensorList {
-    if s:type = "grav" {
-      print "Gravometric sensor detected".
-      set HAS_GRAV_SENSOR to true.
-      return.
-    }
-  }
-  set HAS_GRAV_SENSOR to false.
-}
-
 function BurnTime {
   parameter dV.