Length()

Built-in (engine) Server + client Math

Returns the length of the given vector

Signature

Length(<vector>)

Parameters

Name	Required?	Details
vector	Required	A vector

Example (from Treyarch's docs)

dist = Length(models[j].origin - center)

Real uses in BO3's scripts

Called 88 times in the decompiled scripts. A few, zombies first:

scripts/zm/_zm_unitrigger.gsc, line 178 box_radius = length((unitrigger_stub.script_width / 2, unitrigger_stub.script_length / 2, unitrigger_stub.script_height / 2));
scripts/zm/_zm_weap_ball.gsc, line 2156 bounceforce = length(vel) / 10;
scripts/zm/_zm_weap_castle_rocketshield.gsc, line 409 len = length(lateral);
scripts/zm/_zm_weap_elemental_bow_storm.gsc, line 697 n_length = length(v_away_from_source);
scripts/zm/_zm_weap_elemental_bow_wolf_howl.gsc, line 170 var_f35778e8 = length(var_307bab92 - self geteye());

Related built-ins

Int()
Casts a floating point number or a string to an integer
RandomFloatRange()
Returns a random floating point number r, where min <= r < max
DistanceSquared()
Returns the squared distance between two points - this is cheaper than the actual distance as it doesn't involve a square root
RandomInt()
Returns a random integer between 0 and max-1 inclusive
RandomIntRange()
Returns a random integer r, where min <= r < max
AnglesToForward()
Returns the forward vector corresponding to a set of angles.
VectorNormalize()
Returns a normalized copy of this vector
Abs()
Returns the absolute value of a float
Distance2DSquared()
Returns the squared distance between two points, ignores height difference.
Distance()
Returns the distance between two points
VectorDot()
Returns the dot product of two vectors
VectortoAngles()
Returns a set of angles corresponding to the given vector.

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Built-in descriptions, parameters and examples come from Treyarch's BO3 mod tools docs. Usage links point at shiversoftdev/t7-source (decompiled BO3 scripts).