diff --git a/engine/physint.h b/engine/physint.h
new file mode 100644
index 00000000..9f1c00da
--- /dev/null
+++ b/engine/physint.h
@@ -0,0 +1,113 @@
+/*
+physint.h - Server Physics Interface
+Copyright (C) 2011 Uncle Mike
+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 3 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.
+*/
+#pragma once
+#ifndef PHYSINT_H
+#define PHYSINT_H
+
+#define SV_PHYSICS_INTERFACE_VERSION		6
+
+#define STRUCT_FROM_LINK( l, t, m )		((t *)((byte *)l - (int)&(((t *)0)->m)))
+#define EDICT_FROM_AREA( l )			STRUCT_FROM_LINK( l, edict_t, area )
+
+// values that can be returned with pfnServerState
+#define SERVER_DEAD		0
+#define SERVER_LOADING	1
+#define SERVER_ACTIVE	2
+
+typedef struct areanode_s
+{
+	int		axis;		// -1 = leaf node
+	float		dist;
+	struct areanode_s	*children[2];
+	link_t		trigger_edicts;
+	link_t		solid_edicts;
+	link_t		water_edicts;	// func water
+} areanode_t;
+
+typedef struct server_physics_api_s
+{
+	// unlink edict from old position and link onto new
+	void		( *pfnLinkEdict) ( edict_t *ent, qboolean touch_triggers );
+	double		( *pfnGetServerTime )( void ); // unclamped
+	double		( *pfnGetFrameTime )( void );	// unclamped
+	void*		( *pfnGetModel )( int modelindex );
+	areanode_t*	( *pfnGetHeadnode )( void ); // BSP tree for all physic entities
+	int		( *pfnServerState )( void );
+	void		( *pfnHost_Error )( const char *error, ... );	// cause Host Error
+// ONLY ADD NEW FUNCTIONS TO THE END OF THIS STRUCT.  INTERFACE VERSION IS FROZEN AT 6
+	struct triangleapi_s *pTriAPI;	// draw coliisions etc. Only for local system
+
+	// draw debug messages (must be called from DrawOrthoTriangles). Only for local system
+	int		( *pfnDrawConsoleString )( int x, int y, char *string );
+	void		( *pfnDrawSetTextColor )( float r, float g, float b );
+	void		( *pfnDrawConsoleStringLen )( const char *string, int *length, int *height );
+	void		( *Con_NPrintf )( int pos, char *fmt, ... );
+	void		( *Con_NXPrintf )( struct con_nprint_s *info, char *fmt, ... );
+	const char	*( *pfnGetLightStyle )( int style ); // read custom appreance for selected lightstyle
+	void		( *pfnUpdateFogSettings )( unsigned int packed_fog );
+	char		**(*pfnGetFilesList)( const char *pattern, int *numFiles, int gamedironly );
+	struct msurface_s	*(*pfnTraceSurface)( edict_t *pTextureEntity, const float *v1, const float *v2 );
+	const byte	*(*pfnGetTextureData)( unsigned int texnum );
+
+	// static allocations
+	void		*(*pfnMemAlloc)( size_t cb, const char *filename, const int fileline );
+	void		(*pfnMemFree)( void *mem, const char *filename, const int fileline );
+} server_physics_api_t;
+
+// physic callbacks
+typedef struct physics_interface_s
+{
+	int		version;
+	// passed through pfnCreate (0 is attempt to create, -1 is reject)
+	int		( *SV_CreateEntity	)( edict_t *pent, const char *szName );
+	// run custom physics for each entity (return 0 to use built-in engine physic)
+	int		( *SV_PhysicsEntity	)( edict_t *pEntity );
+	// spawn entities with internal mod function e.g. for re-arrange spawn order (0 - use engine parser, 1 - use mod parser)
+	int		( *SV_LoadEntities )( const char *mapname, char *entities );
+	// update conveyor belt for clients
+	void		( *SV_UpdatePlayerBaseVelocity )( edict_t *ent );
+	// The game .dll should return 1 if save game should be allowed
+	int		( *SV_AllowSaveGame )( void );
+// ONLY ADD NEW FUNCTIONS TO THE END OF THIS STRUCT.  INTERFACE VERSION IS FROZEN AT 6
+	// override trigger area checking and touching
+	int		( *SV_TriggerTouch )( edict_t *pent, edict_t *trigger );
+	// some engine features can be enabled only through this function
+	unsigned int	( *SV_CheckFeatures )( void );
+	// used for draw debug collisions for custom physic engine etc
+	void		( *DrawDebugTriangles )( void );
+	// used for draw debug overlay (textured)
+	void		( *DrawNormalTriangles )( void );
+	// used for draw debug messages (2d mode)
+	void		( *DrawOrthoTriangles )( void );
+	// tracing entities with SOLID_CUSTOM mode on a server (not used by pmove code)
+	void		( *ClipMoveToEntity)( edict_t *ent, const float *start, float *mins, float *maxs, const float *end, trace_t *trace );
+	// tracing entities with SOLID_CUSTOM mode on a server (only used by pmove code)
+	void		( *ClipPMoveToEntity)( struct physent_s *pe, const float *start, float *mins, float *maxs, const float *end, struct pmtrace_s *tr );
+	// called at end the frame of SV_Physics call
+	void		( *SV_EndFrame )( void );
+	// called through save\restore process
+	void		(*pfnCreateEntitiesInTransitionList)( SAVERESTOREDATA*, int levelMask );
+	// called through save\restore process
+	void		(*pfnCreateEntitiesInRestoreList)( SAVERESTOREDATA*, int createPlayers );
+	// allocate custom string (e.g. using user implementation of stringtable, not engine strings)
+	string_t		(*pfnAllocString)( const char *szValue );
+	// make custom string (e.g. using user implementation of stringtable, not engine strings)
+	string_t		(*pfnMakeString)( const char *szValue );
+	// read custom string (e.g. using user implementation of stringtable, not engine strings)
+	const char*	(*pfnGetString)( string_t iString );
+	// helper for restore custom decals that have custom message (e.g. Paranoia)
+	int		(*pfnRestoreDecal)( struct decallist_s *entry, edict_t *pEdict, qboolean adjacent );
+} physics_interface_t;
+
+#endif//PHYSINT_H
+