Vsnap (valve particle snapshot file) that is used by the particle system as a reference for control point data. Generally a .vsnap is a collection of vectors such as vertices from a model, and can be used - for example - to position particles in a certain manner. The .vsnap directory path should be included in the field (ie. particles/particle_snapshots/good_barracks_melee002_lvl1.vsnap). A .vsnap can be generated in the model editor tool after importing a model and specifying a "fx" version of that model (usually a .obj file). Default value is set to blank.