enum
{
	ASW_COLLISION_GROUP_GRUBS = LAST_SHARED_COLLISION_GROUP,
	ASW_COLLISION_GROUP_PARASITE,
	ASW_COLLISION_GROUP_ALIEN,

	// HOUNDEYE = grubs
	ASW_COLLISION_GROUP_MARINE_POSITION_PREDICTION,		// asw
	ASW_COLLISION_GROUP_SHOTGUN_PELLET,		// asw
	ASW_COLLISION_GROUP_EGG,		// asw (alien eggs)
	ASW_COLLISION_GROUP_BLOCK_DRONES,		// asw
	ASW_COLLISION_GROUP_BIG_ALIEN,			// asw (shieldbug, queen)
	ASW_COLLISION_GROUP_BUZZER,
	ASW_COLLISION_GROUP_BODY_SNATCHER,				// asw (shieldbug, queen)
	ASW_COLLISION_GROUP_GRENADES,					// doesn't collide with marines
	ASW_COLLISION_GROUP_NPC_GRENADES,				// doesn't collide with npcs
	ASW_COLLISION_GROUP_BLOB_TINY,
	ASW_COLLISION_GROUP_ALIEN_MISSILE,				// collides with non-alien NPCs
	ASW_COLLISION_GROUP_PLAYER_MISSILE,				// collides with aliens, not players
	ASW_COLLISION_GROUP_SENTRY,						// collides with aliens
	ASW_COLLISION_GROUP_SENTRY_PROJECTILE,			// collides with aliens, marines and doors - nothing else (this is used for the sentry particles)

	ASW_COLLISION_GROUP_BLOCK_ALIENS,				// asw
	ASW_COLLISION_GROUP_IGNORE_NPCS,		// asw (fire walls spreading, collides with everything but aliens, marines) NOTE: Has to be after any NPC collision groups
	ASW_COLLISION_GROUP_FLAMER_PELLETS,		// the pellets that the flamer shoots.  Doesn not collide with small aliens or marines, DOES collide with doors and shieldbugs
	ASW_COLLISION_GROUP_EXTINGUISHER_PELLETS,	// the pellets that the extinguisher shoots. Hits lots of things, but not other weapons
	ASW_COLLISION_GROUP_PASSABLE,		// asw (stuff you can walk through) NOTE: Has to be LAST!

	HL2COLLISION_GROUP_COMBINE_BALL_NPC,
};