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are part of a collection (not necessarily the same collection) and their collisions
are currently enabled (the default condition).
Define Collisions Dialog
Entities Lists the names of the reactor bodies 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
possible pairs that can be made using only the highlighted objects. When off,
the lists contain 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 Box01 and Box02
in the Entities list, then the only possible pair that just includes your selected
objects is Box01<->Box02.
If you highlight Box01, Box02, 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 with the remaining objects in the
collection. This means that the available pairs would now include
Box01<->Box04, Box02<->Box04 and Box03<->Box04.
This option is on by default.
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