From Mod Wiki
string key -- Key to look up the effect from. vector color -- RGB color components. string joint -- Name of the joint to play the effect on. string surfacetype -- surfaceType to look up any special effect from. boolean loop -- Whether the effect should be once only, or loop. float maxVisDist -- Maximum distance the effect will be visible from. boolean isStatic -- Whether the particle effect is static or not
- If no joint is specified, the joint cannot be found, or the entity does not support animated models, the effect will be played at the entity's origin.
- The key must start with 'fx_'.
Looks up an effect on the entity and plays it at the specified joint, and returns a handle to the effect. If a special version matching that of the surfaceType passed is found, that will be played, otherwise the exact key name will be used.