check out this,
http://developer.valvesoftware.com/wiki/Env_beam
Quote:
- 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 <vector> [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 at the time it is attached.
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I'm guessing if you cant do it with the API your using now, you could try a lower level one and set up the parent & attach..
Ive never done this, so maybe it wont work ;]
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