[Source 2013 MP] Wanna edit how your weapon bobs when moving? Lookie here.

weapon_hl2mpbasehlmpcombatweapon.cpp

#if defined( CLIENT_DLL )

//here for compatability purposes
#define	HL2_BOB_CYCLE_MIN	1.5f
#define	HL2_BOB_CYCLE_MAX	0.45f
#define	HL2_BOB			0.002f
#define	HL2_BOB_UP		0.5f

extern float	g_lateralBob;
extern float	g_verticalBob;

static ConVar	cl_bobcyclemin( "cl_bobcyclemin","1.5" );
static ConVar	cl_bobcyclemax("cl_bobcyclemax", "0.45");
static ConVar	cl_bob( "cl_bob","1" );
static ConVar	cl_bobroll("cl_bobroll", "1");
static ConVar	cl_bobpitch("cl_bobpitch", "1");
static ConVar	cl_bobyaw("cl_bobyaw", "1");
static ConVar	cl_bobup( "cl_bobup","0.5" );

// Register these cvars if needed for easy tweaking
static ConVar	v_iyaw_cycle( "v_iyaw_cycle", "2", FCVAR_REPLICATED | FCVAR_CHEAT );
static ConVar	v_iroll_cycle( "v_iroll_cycle", "0.5", FCVAR_REPLICATED | FCVAR_CHEAT );
static ConVar	v_ipitch_cycle( "v_ipitch_cycle", "1", FCVAR_REPLICATED | FCVAR_CHEAT );
static ConVar	v_iyaw_level( "v_iyaw_level", "0.3", FCVAR_REPLICATED | FCVAR_CHEAT );
static ConVar	v_iroll_level( "v_iroll_level", "0.1", FCVAR_REPLICATED | FCVAR_CHEAT );
static ConVar	v_ipitch_level( "v_ipitch_level", "0.3", FCVAR_REPLICATED | FCVAR_CHEAT );

//-----------------------------------------------------------------------------
// Purpose: 
// Output : float
//-----------------------------------------------------------------------------
float CBaseHL2MPCombatWeapon::CalcViewmodelBob( void )
{
	static	float bobtime;
	static	float lastbobtime;
	float	cycle;
	
	CBasePlayer *player = ToBasePlayer( GetOwner() );
	//Assert( player );

	//NOTENOTE: For now, let this cycle continue when in the air, because it snaps badly without it

	if ( ( !gpGlobals->frametime ) || ( player == NULL ) )
	{
		//NOTENOTE: We don't use this return value in our case (need to restructure the calculation function setup!)
		return 0.0f;// just use old value
	}

	//Find the speed of the player
	float speed = player->GetLocalVelocity().Length2D();

	//FIXME: This maximum speed value must come from the server.
	//		 MaxSpeed() is not sufficient for dealing with sprinting - jdw

	speed = clamp( speed, -320, 320 );

	float bob_offset = RemapVal( speed, 0, 320, 0.0f, 1.0f );
	
	bobtime += ( gpGlobals->curtime - lastbobtime ) * bob_offset;
	lastbobtime = gpGlobals->curtime;

	//Calculate the vertical bob
	cycle = bobtime - (int)(bobtime/cl_bobcyclemax.GetFloat())*cl_bobcyclemax.GetFloat();
	cycle /= cl_bobcyclemax.GetFloat();

	if ( cycle < cl_bobup.GetFloat() )
	{
		cycle = M_PI * cycle / cl_bobup.GetFloat();
	}
	else
	{
		cycle = M_PI + M_PI*(cycle-cl_bobup.GetFloat())/(1.0 - cl_bobup.GetFloat());
	}
	
	g_verticalBob = speed*0.005f;
	g_verticalBob = g_verticalBob*0.3 + g_verticalBob*0.7*sin(cycle);

	g_verticalBob = clamp( g_verticalBob, -7.0f, 4.0f );

	//Calculate the lateral bob
	cycle = bobtime - (int)(bobtime/cl_bobcyclemax.GetFloat()*2)*cl_bobcyclemax.GetFloat()*2;
	cycle /= cl_bobcyclemax.GetFloat()*2;

	if ( cycle < cl_bobup.GetFloat() )
	{
		cycle = M_PI * cycle / cl_bobup.GetFloat();
	}
	else
	{
		cycle = M_PI + M_PI*(cycle-cl_bobup.GetFloat())/(1.0 - cl_bobup.GetFloat());
	}

	g_lateralBob = speed*0.005f;
	g_lateralBob = g_lateralBob*0.3 + g_lateralBob*0.7*sin(cycle);
	g_lateralBob = clamp( g_lateralBob, -7.0f, 4.0f );
	
	//NOTENOTE: We don't use this return value in our case (need to restructure the calculation function setup!)
	return 0.0f;
}

//-----------------------------------------------------------------------------
// Purpose: 
// Input  : &origin - 
//			&angles - 
//			viewmodelindex - 
//-----------------------------------------------------------------------------
void CBaseHL2MPCombatWeapon::AddViewmodelBob( CBaseViewModel *viewmodel, Vector &origin, QAngle &angles )
{
	Vector	forward, right;
	AngleVectors( angles, &forward, &right, NULL );

	CalcViewmodelBob();

	// Apply bob, but scaled down to 40%
	VectorMA( origin, g_verticalBob * 0.1f, forward, origin );
	
	// Z bob a bit more
	origin[2] += g_verticalBob * 0.1f;
	
	// bob the angles
	if (cl_bob.GetInt() > 0){
		angles[ROLL] += g_verticalBob * 0.5f * cl_bobroll.GetFloat();
		angles[PITCH] -= g_verticalBob * 0.4f * cl_bobpitch.GetFloat();

		angles[YAW] -= g_lateralBob  * 0.6f * cl_bobyaw.GetFloat();
	}

	VectorMA( origin, g_lateralBob * 0.8f, right, origin );
}