// Update is called once per frame
void Update()
{
// on a deferred add (while running) may get an OP update before actually added to GE. This would be bad.
if (nbody.engineRef == null)
{
return;
}
// TODO: optimize/accuracy: if on rails could use orbitU (or KS) directly
// Now there is MapToRender MUST use physics and not transform position
Vector3 centerPos = GravityEngine.Instance().GetPhysicsPosition(aroundNBody);
// Is the resulting orbit and ellipse or hyperbola?
bool mapToScene = true;
Vector3d pos = ge.GetPositionDoubleV3(nbody);
Vector3d vel;
if (velocityFromScript)
{
vel = new Vector3d(velocity);
}
else
{
vel = ge.GetVelocityDoubleV3(nbody);
}
orbitU.InitFromRVT(pos, vel, ge.GetPhysicalTimeDouble(), aroundNBody, false);
// Add lines to the inclination=0 plane of the orbit
Vector3[] points = orbitU.OrbitPositions(numPoints, centerPos, mapToScene, hyperDisplayRadius);
int totalPoints = numPoints + 2 * numPlaneProjections;
if (numPlaneProjections > 0)
{
Vector3[] pointsWithProj = new Vector3[totalPoints];
int projEvery = numPoints / numPlaneProjections;
int p = 0;
int orbitP = 0;
while (p < totalPoints)
{
pointsWithProj[p++] = points[orbitP];
if ((orbitP % projEvery) == 0)
{
// add a line to plane and back
pointsWithProj[p++] = Vector3.ProjectOnPlane(points[orbitP], planeNormal);
pointsWithProj[p++] = points[orbitP];
}
orbitP++;
}
lineR.SetPositions(pointsWithProj);
}
else
{
lineR.SetPositions(points);
}
}
// Update is called once per frame
void Update()
{
// Now there is MapToRender MUST use physics and not transform position
Vector3 centerPos = GravityEngine.Instance().GetPhysicsPosition(aroundNBody);
// Is the resulting orbit and ellipse or hyperbola?
bool mapToScene = true;
Vector3d pos = ge.GetPositionDoubleV3(nbody);
Vector3d vel;
if (velocityFromScript)
{
vel = new Vector3d(velocity);
}
else
{
vel = ge.GetVelocityDoubleV3(nbody);
}
if (destination != null)
{
// since the segment code just uses this for the angle, the scale does not matter
destPoint = destination.transform.position;
}
orbitU.InitFromRVT(pos, vel, ge.GetPhysicalTimeDouble(), aroundNBody, false);
// TODO: Decide on best segment approach. Common for hyperbola vs ellipse ??
Vector3[] positions;
if (orbitU.eccentricity < 1.0)
{
positions = orbitU.EllipseSegment(numPoints, centerPos, pos.ToVector3(), destPoint, shortPath);
}
else
{
float radius = (pos.ToVector3() - centerPos).magnitude;
positions = orbitU.HyperSegmentSymmetric(numPoints, centerPos, radius, mapToScene);
}
lineR.SetPositions(positions);
}
/// <summary>
/// Computes the transfer and updates all the ghost bodies.
/// </summary>
/// <returns></returns>
private void ComputeTransfer()
{
double timeNow = ge.GetPhysicalTimeDouble();
// First using the transfer time, move the ghost Moon to position at SOI arrival.
// Call evolve via LockAtTime on the ghostMoon to move it. Set position based on this.
double t_flight = tflightFactor * timeHohmann;
double timeatSoi = timeNow + t_flight;
ghostMoonOrbit[MOON_SOI_ENTER].LockAtTime(timeatSoi);
// Determine the moon phase angle
double moonPhase = ghostMoonSoiEnterOrbitPredictor.GetOrbitUniversal().phase;
// Place the TLI ship at the user-requested angle wrt planet-moon line
// Put ghost ship in same orbit geometry as the moon, assuming it is circular. Then
// can use same phase value.
// (Ship needs to reach this departure point, it may not even be on the ship orbit
// in general).
ghostShipOrbit[TLI].phase = shipTLIAngleDeg + (moonPhase + 180f);
ghostShipOrbit[TLI].inclination = ghostMoonOrbit[MOON_SOI_ENTER].inclination;
ghostShipOrbit[TLI].omega_lc = ghostMoonOrbit[MOON_SOI_ENTER].omega_lc;
ghostShipOrbit[TLI].omega_uc = ghostMoonOrbit[MOON_SOI_ENTER].omega_uc;
ghostShipOrbit[TLI].p_inspector = shipOrbit.p;
ghostShipOrbit[TLI].Init();
ghostShipOrbit[TLI].LockAtTime(0);
// Place the SOI enter ship at the user-requested angle in an SOI orbit. Lock at time 0 so the phase
// is held per the user input.
ghostShipOrbit[ENTER_SOI].phase = soiAngleDeg + moonPhase;
ghostShipOrbit[ENTER_SOI].inclination = soiInclination + shipOrbit.inclination;
ghostShipOrbit[ENTER_SOI].omega_lc = ghostMoonOrbit[MOON_SOI_ENTER].omega_lc;
ghostShipOrbit[ENTER_SOI].omega_uc = ghostMoonOrbit[MOON_SOI_ENTER].omega_uc;
ghostShipOrbit[ENTER_SOI].Init();
ghostShipOrbit[ENTER_SOI].LockAtTime(0);
// Find the line to the ENTER_SOI position. Ship departs from that line continued through planet
// at the shipRadius distance (assumes circular ship orbit)
// TODO: Handle planet not at (0,0,0)
Vector3d soiEntryPos = ge.GetPositionDoubleV3(ghostShip[ENTER_SOI]);
Vector3d planetPos = ge.GetPositionDoubleV3(planet);
Vector3d departurePoint = ge.GetPositionDoubleV3(ghostShip[TLI]);
// Use Lambert to find the departure velocity to get from departure to soiEntry
// Since we need 180 degrees from departure to arrival, use LambertBattin
lambertB = new LambertBattin(ghostShip[TO_MOON], planet, departurePoint, soiEntryPos, shipOrbit.GetAxis());
// apply any time of flight change
bool reverse = !shortPath;
const bool df = false;
const int nrev = 0;
int error = lambertB.ComputeXfer(reverse, df, nrev, t_flight);
if (error != 0)
{
Debug.LogWarning("Lambert failed to find solution. error=" + error);
return;
}
// Check Lambert is going in the correct direction
//Vector3 shipOrbitAxis = Vector3.Cross(ge.GetPhysicsPosition(spaceship), ge.GetVelocity(spaceship) ).normalized;
//Vector3 tliOrbitAxis = Vector3.Cross(departurePoint.ToVector3(), lambertB.GetTransferVelocity().ToVector3()).normalized;
Vector3 shipOrbitAxis = Vector3.Cross(ge.GetVelocity(spaceship), ge.GetPhysicsPosition(spaceship)).normalized;
Vector3 tliOrbitAxis = Vector3.Cross(lambertB.GetTransferVelocity().ToVector3(), departurePoint.ToVector3()).normalized;
if (Vector3.Dot(shipOrbitAxis, tliOrbitAxis) < 0)
{
error = lambertB.ComputeXfer(!reverse, df, nrev, t_flight);
if (error != 0)
{
Debug.LogWarning("Lambert failed to find solution for reverse path. error=" + error);
return;
}
}
Debug.LogFormat("tli_vel={0}", lambertB.GetTransferVelocity());
ghostShipOrbit[TO_MOON].InitFromRVT(departurePoint, lambertB.GetTransferVelocity(), timeNow, planet, false);
// Set velocity for orbit around moon. Will be updated every frame
ghostShipOrbit[SOI_HYPER].InitFromRVT(soiEntryPos, lambertB.GetFinalVelocity(), timeNow, ghostMoon[MOON_SOI_ENTER], false);
// Find the exit point of the hyperbola in the SOI
OrbitUtils.OrbitElements oe = OrbitUtils.RVtoCOE(soiEntryPos, lambertB.GetFinalVelocity(), ghostMoon[MOON_SOI_ENTER], false);
Vector3d soiExitR = new Vector3d();
Vector3d soiExitV = new Vector3d();
OrbitUtils.COEtoRVMirror(oe, ghostMoon[MOON_SOI_ENTER], ref soiExitR, ref soiExitV, false);
// Find time to go around the moon. TOF requires relative positions!!
Vector3d ghostSoiEnterPos = ge.GetPositionDoubleV3(ghostMoon[MOON_SOI_ENTER]);
Vector3d soiEnterRelative = soiEntryPos - ghostSoiEnterPos;
Vector3d soiExitRelative = soiExitR - ghostSoiEnterPos;
Vector3d soiExitVelRelative = soiExitV - ge.GetVelocityDoubleV3(ghostMoon[MOON_SOI_ENTER]);
double hyperTOF = ghostShipOrbit[SOI_HYPER].TimeOfFlight(soiEnterRelative, soiExitRelative);
// Position the ghost moon for SOI exit (timeAtSoi includes timeNow)
t_soiExit = timeatSoi + hyperTOF;
ghostMoonOrbit[MOON_SOI_EXIT].LockAtTime(t_soiExit);
// Set position and vel for exit ship, so exit orbit predictor can run.
Vector3d ghostMoonSoiExitPos = ge.GetPositionDoubleV3(ghostMoon[MOON_SOI_EXIT]);
Vector3d ghostMoonSoiExitVel = ge.GetVelocityDoubleV3(ghostMoon[MOON_SOI_EXIT]);
ghostShipOrbit[EXIT_SOI].InitFromRVT(soiExitRelative + ghostMoonSoiExitPos,
soiExitVelRelative + ghostMoonSoiExitVel,
timeNow, planet, false);
}
