View source for Phys lengthconstraint

{{tabs|main=source|source=1|source2=1|phys_lengthconstraint}}
{{lang|title=phys_lengthconstraint}}
{{CD|CPhysLength|file1=physconstraint.cpp|CPhysConstraint}}
{{this is a|point entity|name=phys_lengthconstraint}} It is a [[:Category:Constraints|constraint]] that restricts the maximum (and optionally minimum) distance two objects are allowed to be from each other. It is most often used to simulate [[move_rope|rope]], though it does not support the "stiffening" of rope attachment points that can be observed in reality; an object can rotate a full 360° in fact, clipping right through any rope that may be attached.

{{Important|The constraint is calculated not from the origin/mass centre of the attached entities, but from the entity's own origin and the location of its Hammer [[Hammer_View_Menu#Show_Helpers|helper]] (attachpoint). Be sure to place them appropriately or the game will crash!}}

The constraint can be made rigid with its [[#Flags|second spawnflag]]. It then behaves much like a [[phys_ballsocket]], except that the objects can freely rotate around their ''own'' centres.

''Example map: sourcesdk_content\hl2\mapsrc\sdk_phys_lengthconstraint.vmf''

{{tip|To suspend a standard wooden crate and allow the player to break its constraint by pulling, use a force limit of 1350.}}

== Keyvalues ==
{{KV|Additional Length|intn=addlength|float|Elasticity of the constraint. It is allowed to stretch this many units over or under its maximum and minimum length. The constraint will try to spring back to its preferred length.}}
{{KV|Minimum Length|intn=minlength|float|Minimum distance between origin and attachpoint. Irrelevant if the constraint is rigid. Default is 0.}}
{{KV|Attached object 2 point|intn=attachpoint|vecline|The second end of the constraint (the other is the origin). The second attached entity will be [[phys_constraint|rigidly constrained]] to this location, and the first to the origin.}}
{{KV TwoObjectPhysics}}

== Flags ==
{{Fl TwoObjectPhysics|Keep Rigid}}

== Inputs ==
{{I TwoObjectPhysics}}

== Outputs ==
{{O TwoObjectPhysics}}

[[Category:Constraints|L]]