phys_lengthconstraint
phys_lengthconstraint is a point entity available in all 
Source 2 games. It is a constraint that preserves the distance between two entities. If the 'Keep Rigid' flag is set, think of it as a rod. If not, think off it as a virtual rope.
Contents
Keyvalues
- Name
(targetname)<string> - The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g.
parentnameortarget).
Also displayed in Hammer's 2D views and Entity Report.See also: Generic Keyvalues, Inputs and Outputs available to all entities
- Additional Length
(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.
- Minimum Length
(minlength)<float> - Minimum distance between origin and attachpoint. Irrelevant if the constraint is rigid. Default is 0.
- Attached object 2 point
(attachpoint)<vector> - The second end of the constraint (the other is the origin). The second attached entity will be rigidly constrained to this location, and the first to the origin.
- Enable Collision
(enablecollision)<boolean> - Constraints disable collision between the attached entities. In some rare cases we want to enable this collision.
TwoObjectPhysics:
- Entity 1
(attach1)<targetname> - Entity 2
(attach2)<targetname> - The entities to constrain. Leave one or the other field blank to constrain to the world.
Note:Only one entity will be constrained, even if several share the given targetname. - Constraint System Manager
(constraintsystem)<targetname> - A
phys_constraintsystemthat this constraint should be a part of. This avoids the "jiggling" caused by constraints applied to the same set of entities fighting with each other. - Force Limit to Break
(forcelimit)<float> - Impact force required to break the constraint, in pounds. 0 means infinite. A way of calculating this is to set it to the weight of an object that would break the constraint if it were resting on its objects.
- Torque Limit to Break
(torquelimit)<float> - Torque required to break the constraint, in pounds*inches. 0 means infinite. A way of calculating this is to multiply any reference mass by the resting distance (from the center of mass of the object) needed to break the constraint.
- Play Sound on Break
(breaksound)<string> - A sound played when the constraint is broken.
- Follow teleport distance
(teleportfollowdistance)<float> - If one constrained object teleports more than this many units away, the other will teleport with it.
- Name
(targetname)<string> - The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g.
parentnameortarget).
Also displayed in Hammer's 2D views and Entity Report.See also: Generic Keyvalues, Inputs and Outputs available to all entities
Flags
No Collision until break : [1]
Keep Rigid : [2]
Inputs
TwoObjectPhysics:
Break- Force the constraint to break.
TurnOn- Enable the constraint; do this if the constrained objects don't exist when it spawns. Note that broken constraints cannot be turned back on as they have been deleted.
TurnOff- Disable the constraint.
Outputs
TwoObjectPhysics:
OnBreak- Fired when the constraint breaks.
