ORBITER User Manual
Contents
1. is only possible if the Play at recording speed option is deactivated in the Player dialog ct Fs Otherwise Orbiter sets the time compression directly from the recorded data Recorded flights can be annotated with onscreen notes which appear on the simula tion window at predefined times This opens an exciting new way to write tutorials and space flight demonstrations The annotations can be turned off from the re corder dialog during a playback by deactivating the Show inflight notes option The data for recorded simulation sessions are stored under the Flights subdirectory Orbiter creates a new folder for each recording using the same name as the recorded scenario Each vessel in the scenario writes three data streams to this folder includ ing t position and velocity pos At the moment these data are recorded relative to the reference planet either in a non rotating reference system ecliptic and equinox of J2000 or a rotating equatorial reference system As a result trajecto ries are recorded in an absolute time frame Samples are written in regular inter vals currently 4 seconds or if the velocity vector rotates by more than 5 degrees attitude att Attitude data are saved in terms of the Euler angles of the space craft with respect to the ecliptic reference frame or local horizon frame Samples are written whenever one of the angles has changed by more than a predefined threshold limit F articulation even2. 18 Flight recorder You can record and play back your Orbiter si Flight recorder player mulation sessions with the built in flight re Recoder options corder feature To access the recorder during a REG e aao simulation open the Flight recorder player ae dialog with cu J s You can now select a name Adwanced recorder options for the recorded scenario By default the re Record time acceleration di il ne lt toredcunderin t H Record focus events cor ing will be stored under the curren scena ee a a tops rio name Then press the REC button to begin oy ces asp recording the flight to disc Press the STOP ae ude data button to turn the recorder off again You can ee E chotic frame also start and stop the recorder directly from Local horizon frame the simulation with the keyboard shortcut PET dn ct c An active recorder is indicated by a C Ecliptic fame Record box in the simulation window Equatorial frame frame Some additional recorder options can be ac cessed by pressing the V button These in clude t Record time acceleration this option records any changes in time compres sion during the recording During playback the user has then the option to set time compression automatically from the recorded data P Sampling in system time steps If ticked the intervals between recorded data samples are determined in system time otherwise in simulation time In system time sampling is less den
3. se during time compression This allows to reduce the size of the data files when recording over long periods of time by fast forwarding through less critical parts of a mission P Sampling intervals Currently not used t Attitude data Can be recorded either with respect to the global ecliptic frame of reference or with respect to the local horizon of the current reference celestial body To play back a previously recorded session launch the scenario under the Playback scenario folder During playback all vessels will follow their pre recorded trajectories and will not respond to manual user control At the end of the playback the simula tion will automatically switch back to manual mode and the user can take over con trol You can terminate the playback before the end of the recorded data is reached by pressing ct c or by pressing the STOP button in the Recorder dialog In that case control returns immediately to the user During playback the user has still various op Flight recorder player x tions to interact with the simulation For E Replay options example it is possible to move the camera T aeree e change between internal and external views Staus V Use recorded camera settings and even manipulate the MFD instruments to Playing 7 Use recorded focus events access more flight data Manual control of time ae ee ORBITER User Manual c 2000 2010 Martin Schweiger 103 compression
4. separate Orbiter Technical Note Doc Technotes RecorderRef ORBITER User Manual c 2000 2010 Martin Schweiger 104 18 1 Playback event editor After recording a flight you have the option of using the Playback editor to enhance the playback You can Add annotations which appear on the simulation window at particular times dur ing the replay Change camera positions P Modify the time compression applied during the playback However you can not modify the recorded simulation itself such as changing vessel trajectories engine burn times animations etc To access the Playback editor start a previously recorded scenario then open the playback dialog with ct Fs and click the Playback editor button This will open the playback editor dialog box Event list The top part of the dialog box contains the event list for the scenario Initially this may be empty or contain some event tags that were inserted during the original re cording Each line of the list represents an event Each event contains F atime stamp simulation time since the start of the playback in seconds P an event tag defining the type of event F and event type specific parameters The current simulation time is indicated by a blinking line lt lt lt lt As the playback progresses the current time marker is moving through the event list Sometimes it may be useful to pause a playback ct P in the simulation window to have more time for edi
5. ting the event list Adding a new event Events are always added at the current simulation time that is at the position of the time marker You can however later edit the time stamps of events to move them to a different time First select an event type from the drop down list below the event list The most im portant event types have entries in the list For less frequently used items select the entry and enter the event tag manually Then press the Insert button A new event line will appear in the list and the Edit area in the lower part of the di alog box will allow to define any required parameters Editing an existing event If you want to modify the parameters of an event already in the list simply highlight it by clicking on a line in the list The event parameters will appear in the Edit area and you can modify them Deleting events To delete an event highlight it by clicking on a line in the list Then press the Delete button ORBITER User Manual c 2000 2010 Martin Schweiger 105 Committing changes To commit the changes you have made to the event list press the Commit button at the bottom of the dialog box This will save the modified event list in the playback file Orbiter will immediately re scan the file up to the current simulation time so that any changes can be examined at once ORBITER User Manual c 2000 2010 Martin Schweiger 106
6. ts atc This stream contains changes in thrust levels of spacecraft engines and other types of events e g change of RCS mode activa tion deactivation of navigation modes etc It can also be used by individual ves sel modules to record custom events such as animations Further time compres sion events can be recorded here This data stream can also contain timed anno tations that are displayed on top of the simulation window during replay Anno tations must be added manually to the atc file after the recording is completed A complete recording session consists of the playback scenario in the Scenar ios playback folder and the corresponding flight data folder under the Flights direc tory To share a playback with other Orbiter users these files must be copied Note that the scenario file can be moved to a different Scenario folder but no two playback scenarios can have the same name Be aware that long simulation sessions in particular during time acceleration may lead to very large data files if the Sampling in system time steps option is not used Note that the recorder feature is still under development Future versions may intro duce changes to the recording mechanism and file formats Certain features such as the recording of animations require modifications to the vessel plugin modules and may not be available for all vessel types Implementation details and flight recorder file format specifications can be found in a
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