text: /*
  Copyright (C) 1996-1997 Id Software, Inc.
  
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
  
  See the GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  
  */
  // world.h
  
  typedef struct
  {
  	vec3_t	normal;
  	float	dist;
  } plane_t;
  
  typedef struct
  {
  	qboolean	allsolid;	// if true, plane is not valid
  	qboolean	startsolid;	// if true, the initial point was in a solid area
  	qboolean	inopen, inwater;
  	float	fraction;		// time completed, 1.0 = didn't hit anything
  	vec3_t	endpos;			// final position
  	plane_t	plane;			// surface normal at impact
  	edict_t	*ent;			// entity the surface is on
  } trace_t;
  
  
  #define	MOVE_NORMAL		0
  #define	MOVE_NOMONSTERS	1
  #define	MOVE_MISSILE	2
  
  
  void SV_ClearWorld (void);
  // called after the world model has been loaded, before linking any entities
  
  void SV_UnlinkEdict (edict_t *ent);
  // call before removing an entity, and before trying to move one,
  // so it doesn't clip against itself
  // flags ent->v.modified
  
  void SV_LinkEdict (edict_t *ent, qboolean touch_triggers);
  // Needs to be called any time an entity changes origin, mins, maxs, or solid
  // flags ent->v.modified
  // sets ent->v.absmin and ent->v.absmax
  // if touchtriggers, calls prog functions for the intersected triggers
  
  int SV_PointContents (vec3_t p);
  int SV_TruePointContents (vec3_t p);
  // returns the CONTENTS_* value from the world at the given point.
  // does not check any entities at all
  // the non-true version remaps the water current contents to content_water
  
  edict_t	*SV_TestEntityPosition (edict_t *ent);
  
  trace_t SV_Move (vec3_t start, vec3_t mins, vec3_t maxs, vec3_t end, int type, edict_t *passedict);
  // mins and maxs are reletive
  
  // if the entire move stays in a solid volume, trace.allsolid will be set
  
  // if the starting point is in a solid, it will be allowed to move out
  // to an open area
  
  // nomonsters is used for line of sight or edge testing, where mosnters
  // shouldn't be considered solid objects
  
  // passedict is explicitly excluded from clipping checks (normally NULL)
  