Model animation events #

The model animations in Half-Life can have events attached to specific frames.
Data-wise event is just a number with optional options string.
In the game events are different effects played along with the model animation when it reaches the frame the event resides on.
The events are handled and processed by the game logic. Entity implementations are responsible for handling the events, but there’s a number of shared events, recognized by all monster entities.

The incomplete list of shared events:

1004 - play a sound provided in the options data of the event on the body channel and idle attenuation.
1008 - play a sound provided in the options data of the event on the voice channel and idle attenuation.
1011 - play a sound provided in the options data of the event on the body channel and norm attenuation. Opposing Force compatible.
1012 - play a sound provided in the options data of the event on the voice channel and norm attenuation. Opposing Force compatible.
1013 - play a sound provided in the options data of the event on the weapon channel and norm attenuation. Opposing Force compatible.
1014 - play a soundscript provided in the options data of the event. Featureful SDK specific.
2001 - play the NPC.BodyDrop_Light soundscript.
2002 - play the NPC.BodyDrop_Heavy soundscript.
2010 - play the NPC.SwishSound soundscript.

Clientside events #

The events 5000 and above are considered to be clientside events - they’re playing on client. These are used by weapon viewmodels for playing muzzle flashes and sounds.

New client animation events introduced in Featureful SDK:

5005 - muzzleflash on the first attachment. This is practically the same as event 5001 with the event options set to 31. This is currently a stub for Sven Co-op weapon models. In Sven Co-op the options for event 5005 refer to the txt file that defines the muzzleflash properties. The support for such files might be implemented later.