Phys spring

From Valve Developer Community

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

Table of contents

1 Entity Description 2 Keyvalues 3 Flags 4 Inputs 5 Outputs

Entity Description

A physically simulated spring. length is what's known as the "natural spring length". This is how long the spring would be if it was at rest (nothing hanging on it or attached). When you attach something to the spring, it will stretch longer than its natural length. The amount of stretch is determined by the spring constant constant. The larger the spring constant the less stretch in the spring.

Keyvalues

• targetname <target_source>

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

• hammerid [Episode Two Update]

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

• attach1

<target_destination>

• attach2

<target_destination>

• springaxis

<vecline> Use the helper. Drag it out to match the virtual spring.

• length

<float> How long the spring would be if it was at rest (nothing hanging on it or attached). 0 means the length of the brush.

• constant

<float> Stiffness of the spring. The larger the number the less the spring will stretch.

• damping

<float> Damping constant: how much energy the spring loses. The larger the number, the less bouncy the spring.

• relativedamping

<float> Relative damping constant: the amount of energy the spring loses proportional to the relative velocity of the two objects the spring is attached to.

• breaklength

<float> If the spring's length ever exceeds this length, the spring breaks.

Flags

• 1 : Force only on stretch - This flag will make the spring act like a bungee cord or springy rope.

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.

• SetSpringConstant <float>

Set the Spring Constant.

• SetSpringLength <float>

Set the Spring Length.

• SetSpringDamping <float>

Set the Spring Damping.

Outputs

• OnUser1-4

Fired in response to FireUser1-4 inputs. See User Inputs and Outputs.

!activator = activator