// Update is called once per frame
void FixedUpdate()
{
// monitor for engine start (not ideal, but avoids linking to LaunchUI script)
if ((timeStarted < 0) && engine.engineOn)
{
timeStarted = ge.GetPhysicalTime();
float pitch0 = pitchCurve.Evaluate(0);
Vector3 localVertical = Vector3.Normalize(ge.GetPhysicsPosition(ship) - ge.GetPhysicsPosition(earth));
lastAttitude = Vector3.Cross(localVertical, Vector3.forward); // forward = (0,0,1)
lastAttitude = Quaternion.AngleAxis(pitch0, Vector3.forward) * lastAttitude;
}
if (timeStarted > 0)
{
float t = (float)(ge.GetTimeWorldSeconds() - timeStarted) / timeRangePhysical;
t = Mathf.Clamp(t, 0f, 1f);
// pitch in range 0..90 as curve goes 0..1
float pitch = pitchCurve.Evaluate(t) * 90.0f;
// find the local vertical
Vector3 localVertical = Vector3.Normalize(ge.GetPhysicsPosition(ship) - ge.GetPhysicsPosition(earth));
// First get local horizontal (this ordering of cross product assumes we want to go East)
Vector3 attitude = Vector3.Cross(localVertical, Vector3.forward); // forward = (0,0,1)
attitude = Quaternion.AngleAxis(pitch, Vector3.forward) * attitude;
engine.SetThrustAxis(-attitude);
shipModel.RotateToVector(attitude);
// when attitude changes by 1 degree, re-compute trajectories
if (Vector3.Angle(attitude, lastAttitude) > 1f)
{
ge.TrajectoryRestart();
lastAttitude = attitude;
}
// thrust
float thrust = thrustCurve.Evaluate(t);
engine.SetThrottlePercent(100f * thrust);
}
}
