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Because it's more interesting to learn the programming at least copying a code from spirit to hl.
Oh and all that I wrote above is WORKING!! The problem was that I compiled cl_DLL to wrong folder.
So, now admin of this site can add my tutor to tutors page if u want.

Hi Guys! I'm not native speaker of english, so excuses if i have some mistakes

I'm making a mod for HL1 based on SDK2.3 and i need to insert the 3dskybox ability. I tried to copy it from Spirit, but it doesnt work, cause i'm not a coder, and may be i missed some little things. If here are some experienced guys, can you help me please to complete my task.
I show below what exactly i did, if you'll see something missing, gratefuly if you correct it

THIS below IS IN HL.DLL

effects.cpp added a class:
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class CEnvSky : public CBaseEntity
{
public:

void Activate( void );
void Think( void );

};

void CEnvSky :: Activate ( void )
{

pev->effects |= EF_NODRAW;
pev->nextthink = gpGlobals->time + 1.0;

}

extern int gmsgSetSky;

void CEnvSky :: Think ()
{

MESSAGE_BEGIN(MSG_BROADCAST, gmsgSetSky, NULL);
WRITE_BYTE(1); // mode
WRITE_COORD(pev->origin.x); // view position
WRITE_COORD(pev->origin.y);
WRITE_COORD(pev->origin.z);
MESSAGE_END();

}

LINK_ENTITY_TO_CLASS( env_sky, CEnvSky );

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then i went toplayer.cpp and after line

int gmsgTeamNames = 0;

i put:

int gmsgSetSky = 0;

In same file, i found:
gmsgSelAmmo = REG_USER_MSG("SelAmmo", sizeof(SelAmmo));

and put nearby:
gmsgSetSky = REG_USER_MSG( "SetSky", 7 );

At this i've finished working in hl.dll

Go to c_dll.dll

Open hud.cpp
find:
//DECLARE_MESSAGE(m_Logo, Logo)
int __MsgFunc_ResetHUD(const char *pszName, int iSize, void *pbuf)
{

return gHUD.MsgFunc_ResetHUD(pszName, iSize, pbuf );

}

and put after that this new code:

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int __MsgFunc_SetSky(const char *pszName, int iSize, void *pbuf)
{

gHUD.MsgFunc_SetSky( pszName, iSize, pbuf );
return 1;

}
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In same file find this line:

HOOK_MESSAGE( Concuss );

and put neraby:
HOOK_MESSAGE( SetSky );

Now i go to hud.h
and before this line:

class CHud

i put:

#define SKY_OFF 0
#define SKY_ON 1

in same file, after this line:

int GetNumWidth(int iNumber, int iFlags);

i put:
Vector m_vecSkyPos;
int m_iSkyMode;

next, i find this existing line:

int _cdecl MsgFunc_Concuss( const char *pszName, int iSize, void *pbuf );

and put nearby:
void _cdecl MsgFunc_SetSky( const char *pszName, int iSize, void *pbuf );

now i go to hud_msg.cpp
find:

void CHud :: MsgFunc_InitHUD( const char *pszName, int iSize, void *pbuf )
{

and after braket i put:
m_iSkyMode = SKY_OFF;

it must come like that:
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void CHud :: MsgFunc_InitHUD( const char *pszName, int iSize, void *pbuf )
{

m_iSkyMode = SKY_OFF;

// prepare all hud data
HUDLIST *pList = m_pHudList;

while (pList)
{
    if ( pList->p )
        pList->p->InitHUDData();
    pList = pList->pNext;
}

//Probably not a good place to put this.
pBeam = pBeam2 = NULL;

}
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and below i put:
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void CHud :: MsgFunc_SetSky( const char *pszName, int iSize, void *pbuf )
{

//  CONPRINT("MSG:SetSky");
BEGIN_READ( pbuf, iSize );

m_iSkyMode = READ_BYTE();
m_vecSkyPos.x = READ_COORD();
m_vecSkyPos.y = READ_COORD();
m_vecSkyPos.z = READ_COORD();

}
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open view.cpp
find:

void V_CalcNormalRefdef ( struct ref_params_s *pparams )

and in the end of it i put this:

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if (gHUD.m_iSkyMode == SKY_ON && pparams->nextView == 0)
{

pparams->vieworg[0] = gHUD.m_vecSkyPos.x;
pparams->vieworg[1] = gHUD.m_vecSkyPos.y;
pparams->vieworg[2] = gHUD.m_vecSkyPos.z;
pparams->nextView = 1;

}

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in the same file find this:

view = gEngfuncs.GetViewModel();

and after i put this:

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if (gHUD.m_iSkyMode == SKY_ON)
{

savedviewmodel = view->model;
view->model = NULL;

}
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Im really noob in the programming and need your help!
It could be nice tutor for newbies like me if to finish it with help of expirienced dads