Huron & SNAP Documentation

↓ Exporting a trajectory to a
Locator script
↓ To change a trajectory’s
properties
↓ Manipulating trajectories by
clicking and dragging
Sequencing Functions
↓ To play the current scene
↓ More on recording
THE SIMULATION TOOLS
• Select Export from the Edit menu and then choose a
filename for the script in the file dialog.
The trajectory will be written into a new Locator script,
beginning at time 0.
• Select Properties from the Edit menu.
As well as using the formal methods of trajectory manipulation,
it is also possible to move trajectories by clicking on them and
dragging them to a new desired position. Use the Ctrl key
while releasing the mouse to copy the selected trajectories
rather than move them.
• Click the Play button or select Play from the Sequence
menu.
If using internal synchronisation, the scene will begin playing
from the time marker position. Sonic Animator uses the PCs
internal timer mechanisms to generate a timer message
whenever the interval specified in the Scene Properties dialog
has elapsed.
At this stage, two things may happen. If a track is interpolated
and the current time is corresponds to somewhere inside a
trajectory, then the sequencer will find the two events on either
side of this time and linearly interpolate between them to give a
position to output. If the time does not fall within a trajectory
then no messages will be sent and the location will remain
where it was at the end of the last trajectory. Conversely, if the
track is not interpolated, then the sequencer will play all events
that have become due since the last timer message.
The time marker will move along as the scene is played.
However, updating the time marker is a low priority task and
only happens when the system is idle. Thus, when the
sequencer is using a lot of CPU time sending events, the time
marker won’t move.
Recording uses a similar mechanism to playing but is slightly
more complex. The same timer mechanism is used to update
the current time and the time marker. When a message arrives,
the sequencer finds the time of the last timer message and
applies this to the received message when writing it into the
scene. If multiple messages arrive between timer updates then
the later events are discarded.
HURON TECHNICAL MANUAL PAGE 130