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Replay parameters |
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Replay parameters |
The replay can be controlled by the following parameters that can be set on the replay parameters form, accessed using the edit replay parameters button.
The part of the simulation that the replay covers.
For time domain analyses, you can select to replay the whole simulation, just one simulation stage (an asterisk * denotes an incomplete stage), the latest wave period or a user-specified period. If you select user-specified, then you can enter your own start and end times for the replay period. These can be set to ~ which is interpreted as simulation start time and simulation finish time respectively.
To synthesise a replay following a frequency domain solve, the start and end times must be specified.
The simulation time step size between frames of the replay. Using shorter intervals means that you see a smoother animation (though the extra drawing required may slow the animation).
For time domain analyses, the value ~ is interpreted as the actual sample interval, i.e. the smallest possible interval.
For synthesised replays following a frequency domain solve, the value ~ is interpreted as the sample interval for time history synthesis.
| Example: | For a time domain simulation with stages of 8 seconds each, selecting stage 2 and a replay time step of 0.5 seconds causes the replay to show 16 frames, corresponding to times 8.0, 8.5, 9.0, …, 15.5. |
For regular-spaced time replays, there is a well-defined relationship between replay frame rate and real time. For snapshot replays, however, there is no such relationship, so in order to make the replay speed setting meaningful, we introduce an artificial frame interval. For example, if the replay speed is set to 100%, then the replay frame rate is equal to $1/T$ where $T$ is the specified frame interval. If the replay speed is set to 200%, then the frame rate is $2/T$, and so on.
Determines how fast the replay is played. It is specified as a percentage of real time, so 100% means at real time, 200% means twice as fast etc.
Continuous means replaying like an endless film loop, automatically cycling back to the first frame after the last frame has been shown; this is suitable for replays of whole cycles of regular cyclic motion. Non-continuous means that there will be a pause at the end of the replay, before it starts again at the beginning; this is more suitable for non-cyclic motion.
If this is selected, then the replay is shown in all 3D views simultaneously, allowing motion to be viewed from several different viewpoints. Otherwise the replay is played in the currently selected view window only.
If this is selected, then when each frame of the replay is drawn the previous frame is first overdrawn in grey – this results in grey trails showing the path of each object.