9

Collisions Rollout 811
Filter B efore Storing—
See Storing and Accessi ng
Collisions (page 2–774).
Define Collision Pairs—Opens the Define Collisions
dialog (page 2–811) . Thisallowsyoutotoggle
collision detection between specified pairs of
objects. Pairs of objects with disabled collisions
pass through each other during the simulation.
Selected Pair: Enable—Lets you quickly enable
collisions between the selected pair of objects. This
button is available only when both objects are part
of a collection (not necessarily the same collection)
and their collisions are cur rently disabled.
Selected Pair: Disable—Click this button to quickly
disable collisions between the selected pair of
objects. This button is available only when both
objects are part of a collection (not necessarily the
same collection) and their collisions are currently
enabled (the default condition).
Define Collisions Dialog
Entities—Liststhenamesofthereactorbodies
in the scene (any object added to a collection).
Highlighting one object populates the Enabled
Collisions and Disabled Collisions lists for that
object with respect to the other bodies in the scene.
If you select more than one object in this list, how
the Enabled/Disabled lists are populated depends
on the value of Common Collisions.
Common Collisions—When on, if more than
one object is highlighted in the Entities list, the
Enabled and Disabled lists are populated from the
list of poss ible pairs that c an be made us ing only
thehighlightedobjects.Whenoff,thelistscontain
all possible pairs from the scene that contain at
least one of your selected objects.
For example, take a scene containing four bodies:
Box01, Box02, Box03, and Box04. If Common
Collisions is on, and you then highlight B ox01 and
Box02 in the Entities list, then the only p o ssible
pair that just includes your selected objects is
Box01<->Box02.
If you high lig ht Box01, B ox02, and Box03,
the possible pairs using these objects are
Box01<->Box02, Box02<->Box03 and
Box01<->Box03. If you highlight the same
objects with Common Collisions off, then the
lists also include the highlighted objects paired
w ith the remaining objects in the collection.
This means that the available pairs would now
include Box01<->Box04, B ox02<->Box04 and
Box03<->Box04.
This option is on by default.
Enabled Collisions—Lists pairs with collisions
enabled.
Disabled Collisions—Lists pairs with collisions
disabled.
Disa ble Sel ection (R ight Ar r ow)—Moves pairs
high lighted in the Enabled list to the Disabled list.
Disabl e A ll (Double R ight Ar row)—Moves all pairs
in the Enabled list to the Disabled list.
Enable S election (Left Arr ow)—Moves the pairs
highlighted in the Disabled list to the Enabled list.
Enable All (Double Left Ar row)—Movesallpairsin
the Disabled list to the Enabled list.
OK —Closes the dialog, saving any changes carried
out while the dialog was open.
Cance l—Closes the dia log without saving changes.