8

Cache Operator 197
andisabletojumptoanarbitraryframewithout
the need for test results.
Save Cache with File—When on, the software
Includes the cached data with scenes that you sav e
to disk. This can significantly increase the size
of saved fi les, but saves the time of recalculating
theparticlemotionuponreloadingthefile.
Default=off.
N ormally, the cache data is saved o nly in disk
files that you create w ith the Save or Save As
commands. You can a lso inst ruct the sof tware to
include cached data with other types of files using
the two following options.
Save Cache with Hold—Saves cached data in
the Hold file, created with Edit menu > Hold.
Default=off.
Manual Update group
Thesecontrolsletyouupdateorclearthecache
manually within a frame range, or clear the entire
cache.
Update—Calculates particle motion within the
current range (defined below ) and stores it in
the cache, replacing any existing cached data.
Available only when Range is set to Active Segment
or Custom.
During the update, the software temporarily
closes Particle View and displays a Cache Update
Progress bar, while mov ing the t ime slider through
the cached range. At the same time, by default, the
animation plays in the viewports. To prevent this,
and speed calculation, turn off U pdate Viewports.
If the cache runs out of memory during a manual
update,ParticleFlowhaltstheupdateoperation
and displays an alert. Click OK to continue, and
then, if possible, increase the Limit value before
updating the cache again.
Cle ar—Deletes any cached data.
Afteryouclearthecachebuffer,ifyougotoa
different frame or change any action parameters,
the software automatically caches particle motion
even if Update is set to Manually.
Range—Sets the frame range within which the
Cache operator recalculates data when you click
Update. Default=Active Seg ment.
•
Co mplete —The software clears the cache for
entire animation. Choosing Complete makes
theUpdatebuttonunavailable;thisoptionisfor
clearing the cache only.
Toupdatetheentireanimation,settheactive
segment or the custom range to encompass a ll
frames, and then use the corresponding choice
and click Update.
•
Active Segment—Thesoftwareupdatesthe
cacheonlyforframesintheactivesegment,
as defined by the Start Time and En d Time
settings on the Time Configuration dialog. This
istheframerangeshownonthetrackbar.You
can also change the active segment by holding
dow n ALT+CTRL and dragging the track bar
w ith the lef t, midd le, or right mouse button.
•
Custom—Thesoftwareupdatesthecacheonly
for only frames in the custom range, as defined
by the Star t Time and E nd Time settings (see
following).
Start/End T ime—The first and last frames of the
range that’s updated when Range=Custom (see
above). Defaults=0, 30.
Update Viewports—When on, the animation
playsintheviewportsduringmanualupdating
of the cache. Turn this off to disable playing
the animation in the viewports during manual
caching; this can speed up the caching process,
especially with large or complex particle systems.
Default=on.