Object that specifies the collision filtering properties of this body.
Collisions between two bodies will obey the following rules:
collisionFilter.group, they will always collide if the value is positive, and they will never collide if the value is negative.
collisionFilter.groupor if one (or both) of the bodies has a value of 0, then the category/mask rules apply as follows:
Each body belongs to a collision category, given by
value is used as a bit field and the category should have only one bit set, meaning that
the value of this property is a power of two in the range [1, 2^31]. Thus, there are 32
different collision categories available.
Each body also defines a collision bitmask, given by
collisionFilter.mask which specifies
the categories it collides with (the value is the bitwise AND value of all these categories).
Using the category/mask rules, two bodies
B collide if each includes the other's
category in its mask, i.e.
(categoryA & maskB) !== 0 and
(categoryB & maskA) !== 0
are both true.
A bit field that specifies the collision category this body belongs to. The category value should have only one bit set, for example
A bit mask that specifies the collision categories this body may collide with.