Info constraint anchor

From Valve Developer Community

The title given to this article is incorrect due to technical limitations. The correct title is info_constraint_anchor.

This point-based entity is available in all Source games.

Table of contents

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Entity Description

An entity used to attach constraints to a local position on an entity. Usually constraints will attach to the center of mass of an object. Attach the desired constraint to this entity, and then parent this entity to the entity you want the constraint to apply to.

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Availability

This point-based entity is available in: all Source games. In code it is represented by class CConstraintAnchor (http://doxygen.page.needed/class_c_constraint_anchor.html), defined in physconstraint.cpp (http://doxygen.page.needed/physconstraint_8cpp-source.html).

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Keyvalues

targetname <target_source>

Defines the name that other entities refer to this entity by.

hammerid [New with Orange Box]

<integer readonly> This id is used for debugging purposes in Hammer.

parentname <target_destination>

Specifies the targetname of this entity's Parent in a movement hierarchy. Child entities mimic the movements of their Parent.

massScale

<float> Amount to scale the mass of this body in the constraint solver.

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Inputs

Kill

Removes this entity from the world.

KillHierarchy

Removes this entity and all its children from the world.

AddOutput <string>

Evaluates a keyvalue/output on this entity. It can be potentially very dangerous, use with care.

Format: <key> <value>

Format: <output name> <targetname>:<inputname>:<parameter>:<delay>:<max times to fire (-1 == infinite)>

FireUser1-4

Causes this entity's OnUser1-4 outputs to be fired. See User Inputs and Outputs.

SetParent <target_destination>

Changes the entity's parent in the movement hierarchy.

SetParentAttachment <string>

Change this entity to attach to a specific attachment point on its parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment.

SetParentAttachmentMaintainOffset <string> [Episode One Update]

Change this entity to attach to a specific attachment point on it's parent. Entities must be parented before being sent this input. The parameter passed in should be the name of the attachment. The entity will maintain it's position relative to the Parent's Origin and Angles at the time it is attached.