Lowering your weapon on sprint

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This article will deal with lowering your weapon while sprinting and disable the ability to shoot at the same time. This was based on a topic on the Steam Forums

Note:This has only been tested with the latest HL2MP OB engine code.
Note:This will not work if your weapon doesn't have the ACT_VM_IDLE_LOWERED animation in its .qc file (The Viewmodel). To fix this install Studio Compiler and decompile your Viewmodel and decompile one of your other models which has this animation, then add that animation into your decompiled .qc file. To find out how to add the animation just copy the animation from the working viewmodel .qc file.
Note:If your weapon_yourweaponname.cpp is overriding ItemPostFrame then you have to place BaseClass::ProcessAnimationEvents(); in the ItemPostFrame of that class but only if you aren't calling BaseClass::ItemPostFrame();. For example in the weapon_shotgun.cpp it has an override of ItemPostFrame which means that the lowering weapon code will not be called for this weapon unless you add a call to it! Remember to put the Basecombatweapon_Shared.h declarations under public or protected so that you can make use of these variables in classes which inherit basecombatweapon_shared, like the weapon_shotgun.cpp's ItemPostFrame. If you don't do this you will get undeclared identifier errors
Note:Download the Studio Compiler here [1] (only necessary if your weapon doesn't have the ACT_VM_IDLE_LOWERED animation!)

The Code

Note:In this Tutorial you will do this by coding only, so open up your basecombatweapon_shared.cpp and basecombatweapon_shared.h

BASECOMBATWEAPON_SHARED.CPP

Hit CTRL+F and search for this code:

void CBaseCombatWeapon::ItemPostFrame( void )

Then copy and paste this above it:

void CBaseCombatWeapon::ProcessAnimationEvents(void)
{
	CBasePlayer *pOwner = ToBasePlayer( GetOwner() );
	if (!pOwner)
		return;

	if ( !m_bWeaponIsLowered && (pOwner->m_nButtons & IN_SPEED ) )
	{
		m_bWeaponIsLowered = true;
		SendWeaponAnim( ACT_VM_IDLE_LOWERED );
		m_flNextPrimaryAttack = gpGlobals->curtime + GetViewModelSequenceDuration();
	        m_flNextSecondaryAttack = m_flNextPrimaryAttack;
	}
	else if ( m_bWeaponIsLowered && !(pOwner->m_nButtons & IN_SPEED ) )
	{
		m_bWeaponIsLowered = false;
		SendWeaponAnim( ACT_VM_IDLE );
		m_flNextPrimaryAttack = gpGlobals->curtime + GetViewModelSequenceDuration();
 	        m_flNextSecondaryAttack = m_flNextPrimaryAttack;
	}

	if ( m_bWeaponIsLowered )
	{
		if ( gpGlobals->curtime > m_flNextPrimaryAttack )
		{
			SendWeaponAnim( ACT_VM_IDLE_LOWERED );
			m_flNextPrimaryAttack = gpGlobals->curtime + GetViewModelSequenceDuration();
			m_flNextSecondaryAttack = m_flNextPrimaryAttack;
		}
	}
}

Now to make sure our code gets called we add ProcessAnimationEvents(); here:

void CBaseCombatWeapon::ItemPostFrame( void )
{
      //Add this underneath the pOwner accessor check.
      ProcessAnimationEvents();
}

BASECOMBATWEAPON_SHARED.H

Add these declarations under public at line 211 below bool IsViewModelSequenceFinished( void ); // Returns if the viewmodel's current animation is finished:

Note:We make ProcessAnimationEvents virtual so that we can override it in classes which inherit this class.
	virtual void            ProcessAnimationEvents(void);
	bool                    m_bWeaponIsLowered;

Finish

Now your weapon should be lowered when you hit the sprint button and you will not be able to shoot until you release the button!