Info particle system

Keyvalues

Particle System Name <string>: The name of the particle system to spawn. NOT the name of a PCF file!
Start Active? <bool>: Whether the particle system should begin as soon as the entity spawns.
Control Point 1 to Control Point 63 <targetname>: Sets the CP to the given entity's location.
Todo: Updated after spawn?

Warning:If a field is left blank, all those following it will be ignored.
Control Point 1's Parent to Control Point 7's Parent <int>: The CP to act as a parent to this CP.

Parentname:

Parent (parentname) <targetname>: Specifies a movement parent. An entity will maintain its initial offset from its parent. An attachment point can be added to the end of the name, separated by a comma.

Pitch Yaw Roll (Y Z X) (angles) <QAngle>: This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.

Name (targetname) <string>[ Edit ]: The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g. parentname or target).
Also displayed in Hammer's 2D views and Entity Report. See also: Generic Keyvalues, Inputs and Outputs available to all entities

Parentname:

SetParent <stringRedirectInput/string>: Move with this entity. See Entity Hierarchy (parenting).

SetParentAttachment <stringRedirectInput/string>: Change this entity to attach to a specific attachment point on its parent. The entity will teleport so that the position of its root bone matches that of the attachment. Entities must be parented before being sent this input.

SetParentAttachmentMaintainOffset <stringRedirectInput/string>: As above, but without teleporting. The entity retains its position relative to the attachment at the time of the input being received.

ClearParent: Removes this entity from the the movement hierarchy, leaving it free to move independently.