C++ IPhysicsObject类代码示例

Vector Pickup_PhysGunLaunchVelocity( CBaseEntity *pObject, const Vector &vecForward, PhysGunForce_t reason )
{
	// The object must be valid
	if ( pObject == NULL )
	{
		Assert( 0 );
		return vec3_origin;
	}

	// Shouldn't ever get here with a non-vphysics object.
	IPhysicsObject *pPhysicsObject = pObject->VPhysicsGetObject();
	if ( pPhysicsObject == NULL )
	{
		Assert( 0 );
		return vec3_origin;
	}

	// Call the pickup entity's callback
	IPlayerPickupVPhysics *pPickup = dynamic_cast<IPlayerPickupVPhysics *>(pObject);
	if ( pPickup != NULL && pPickup->ShouldPuntUseLaunchForces( reason ) )
		return pPickup->PhysGunLaunchVelocity( vecForward, pPhysicsObject->GetMass() );

	// Do our default behavior
	return Pickup_DefaultPhysGunLaunchVelocity(	vecForward, pPhysicsObject->GetMass() );
}

//-----------------------------------------------------------------------------
// Purpose: Adds the entity's mass to the aggregate mass consumed
//-----------------------------------------------------------------------------
void CGravityVortexController::ConsumeEntity( CBaseEntity *pEnt )
{
	// Get our base physics object
	IPhysicsObject *pPhysObject = pEnt->VPhysicsGetObject();
	if ( pPhysObject == NULL )
		return;

	// Ragdolls need to report the sum of all their parts
	CRagdollProp *pRagdoll = dynamic_cast< CRagdollProp* >( pEnt );
	if ( pRagdoll != NULL )
	{		
		// Find the aggregate mass of the whole ragdoll
		ragdoll_t *pRagdollPhys = pRagdoll->GetRagdoll();
		for ( int j = 0; j < pRagdollPhys->listCount; ++j )
		{
			m_flMass += pRagdollPhys->list[j].pObject->GetMass();
		}
	}
	else
	{
		// Otherwise we just take the normal mass
		m_flMass += pPhysObject->GetMass();
	}

	// Destroy the entity
	UTIL_Remove( pEnt );
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
int CPhysBox::OnTakeDamage( const CTakeDamageInfo &info )
{
	// note: if motion is disabled, OnTakeDamage can't apply physics force
	int ret = BaseClass::OnTakeDamage( info );

	// Check our health against the threshold:
	if( m_damageToEnableMotion > 0 && GetHealth() < m_damageToEnableMotion )
	{
		// only do this once
		m_damageToEnableMotion = 0;

		IPhysicsObject *pPhysicsObject = VPhysicsGetObject();
		if ( pPhysicsObject != NULL )
		{
			pPhysicsObject->Wake();
			pPhysicsObject->EnableMotion( true );
			
			VPhysicsTakeDamage( info );
		}
	}

	if ( info.GetInflictor() )
	{
		m_OnDamaged.FireOutput( info.GetAttacker(), this );
	}

	return ret;
}

void CPhysicsSpring::GetSpringObjectConnections( string_t nameStart, string_t nameEnd, IPhysicsObject **pStart, IPhysicsObject **pEnd )
{
	IPhysicsObject *pStartObject = FindPhysicsObject( STRING(nameStart) );
	IPhysicsObject *pEndObject = FindPhysicsObject( STRING(nameEnd) );

	// Assume the world for missing objects
	if ( !pStartObject )
	{
		pStartObject = g_PhysWorldObject;
	}
	else if ( !pEndObject )
	{
		// try to sort so that the world is always the start object
		pEndObject = pStartObject;
		pStartObject = g_PhysWorldObject;
	}
	else
	{
		CBaseEntity *pEntity0 = (CBaseEntity *) (pStartObject->GetGameData());
		g_pNotify->AddEntity( this, pEntity0 );

		CBaseEntity *pEntity1 = (CBaseEntity *) pEndObject->GetGameData();
		g_pNotify->AddEntity( this, pEntity1 );
	}

	*pStart = pStartObject;
	*pEnd = pEndObject;
}

void C_HL2MPRagdoll::ImpactTrace( trace_t *pTrace, int iDamageType, const char *pCustomImpactName )
{
	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

	if( !pPhysicsObject )
		return;

	Vector dir = pTrace->endpos - pTrace->startpos;

	if ( iDamageType == DMG_BLAST )
	{
		dir *= 4000;  // adjust impact strenght
				
		// apply force at object mass center
		pPhysicsObject->ApplyForceCenter( dir );
	}
	else
	{
		Vector hitpos;  
	
		VectorMA( pTrace->startpos, pTrace->fraction, dir, hitpos );
		VectorNormalize( dir );

		dir *= 4000;  // adjust impact strenght

		// apply force where we hit it
		pPhysicsObject->ApplyForceOffset( dir, hitpos );	

		// Blood spray!
//		FX_CS_BloodSpray( hitpos, dir, 10 );
	}

	m_pRagdoll->ResetRagdollSleepAfterTime();
}

// as CItem, but we don't install the touch function
void CASW_Pickup::Spawn( void )
{
	SetMoveType( MOVETYPE_FLYGRAVITY );
	SetSolid( SOLID_BBOX );
	SetBlocksLOS( false );
	AddEFlags( EFL_NO_ROTORWASH_PUSH );
	
	// This will make them not collide with the player, but will collide
	// against other items + weapons
	SetCollisionGroup( COLLISION_GROUP_WEAPON );
	CollisionProp()->UseTriggerBounds( true, ITEM_PICKUP_BOX_BLOAT );
	//SetTouch(&CItem::ItemTouch);

	if ( CreateItemVPhysicsObject() == false )
		 return;
	
	m_takedamage = DAMAGE_EVENTS_ONLY;

#ifdef HL2MP
	SetThink( &CItem::FallThink );
	SetNextThink( gpGlobals->curtime + 0.1f );
#endif
	
	if ( m_bFreezePickup )
	{
		IPhysicsObject *pPhysicsObject = VPhysicsGetObject();
		if ( pPhysicsObject != NULL )
		{
			pPhysicsObject->EnableMotion( false );
		}
	}
}

void CEnvHeadcrabCanister::TestForCollisionsAgainstWorld( const Vector &vecEndPosition )
{
	// Splash damage!
	// Iterate on all entities in the vicinity.
	float flDamageRadius = m_flDamageRadius;
	float flDamage = m_flDamage;

	CEntity *pEntity;
	for ( CEntitySphereQuery sphere( vecEndPosition, flDamageRadius ); ( pEntity = sphere.GetCurrentEntity() ) != NULL; sphere.NextEntity() )
	{
		if ( pEntity == this )
			continue;

		if ( !pEntity->IsSolid() )
			continue;

		// Get distance to object and use it as a scale value.
		Vector vecSegment;
		VectorSubtract( pEntity->GetAbsOrigin(), vecEndPosition, vecSegment ); 
		float flDistance = VectorNormalize( vecSegment );

		float flFactor = 1.0f / ( flDamageRadius * (INNER_RADIUS_FRACTION - 1) );
		flFactor *= flFactor;
		float flScale = flDistance - flDamageRadius;
		flScale *= flScale * flFactor;
		if ( flScale > 1.0f ) 
		{ 
			flScale = 1.0f; 
		}
		
		// Check for a physics object and apply force!
		Vector vecForceDir = vecSegment;
		IPhysicsObject *pPhysObject = pEntity->VPhysicsGetObject();
		if ( pPhysObject )
		{
			// Send it flying!!!
			float flMass = PhysGetEntityMass( pEntity );
			vecForceDir *= flMass * 750 * flScale;
			pPhysObject->ApplyForceCenter( vecForceDir );
		}

		if ( pEntity->m_takedamage && ( m_flDamage != 0.0f ) )
		{
			CTakeDamageInfo info( BaseEntity(), BaseEntity(), flDamage * flScale, DMG_BLAST );
			CalculateExplosiveDamageForce( &info, vecSegment, pEntity->GetAbsOrigin() );
			pEntity->TakeDamage( info );
		}

		if ( pEntity->IsPlayer() && !(static_cast<CPlayer*>(pEntity)->IsInAVehicle()) )
		{
			if (vecSegment.z < 0.1f)
			{
				vecSegment.z = 0.1f;
				VectorNormalize( vecSegment );					
			}
			float flAmount = SimpleSplineRemapVal( flScale, 0.0f, 1.0f, 250.0f, 1000.0f );
			pEntity->ApplyAbsVelocityImpulse( vecSegment * flAmount );
		}
	}
}

//-----------------------------------------------------------------------------
// Purpose:
// Input  :
// Output :
//-----------------------------------------------------------------------------
int CTDP_NPC_CombineS::TakeDamage( const CTakeDamageInfo &info )
{
	if( info.GetInflictor() && info.GetInflictor()->VPhysicsGetObject() )
	{
		// Hit by a physics object! Was I blocking?
		if( m_fIsBlocking )
		{
			IPhysicsObject *pPhysObject;

			pPhysObject = info.GetInflictor()->VPhysicsGetObject();

			if( pPhysObject )
			{
				// Only deflect objects of relatively low mass
				//DevMsg( "MASS: %f\n", pPhysObject->GetMass() );

				if( pPhysObject->GetMass() <= 30.0 )
				{
					// No damage from light objects (tuned for melons)
					return 0;
				}
			}
		}
	}

	BaseClass::TakeDamage( info );
	return 0;
}

//-----------------------------------------------------------------------------
// Step iteratively toward a destination position
//-----------------------------------------------------------------------------
AIMotorMoveResult_t CAI_Motor::MoveGroundStep( const Vector &newPos, CBaseEntity *pMoveTarget, float yaw, bool bAsFarAsCan, AIMoveTrace_t *pTraceResult )
{
	// By definition, this will produce different results than GroundMoveLimit() 
	// because there's no guarantee that it will step exactly one step 

	// See how far toward the new position we can step...
	// But don't actually test for ground geometric validity;
	// if it isn't valid, there's not much we can do about it
	AIMoveTrace_t moveTrace;
	GetMoveProbe()->TestGroundMove( GetLocalOrigin(), newPos, MASK_NPCSOLID, AITGM_IGNORE_FLOOR, &moveTrace );
	if ( pTraceResult )
	{
		*pTraceResult = moveTrace;
	}

	bool bHitTarget = (moveTrace.pObstruction && (pMoveTarget == moveTrace.pObstruction ));

	// Move forward either if there was no obstruction or if we're told to
	// move as far as we can, regardless
	bool bIsBlocked = IsMoveBlocked(moveTrace.fStatus);
	if ( !bIsBlocked || bAsFarAsCan || bHitTarget )
	{
		// The true argument here causes it to touch all triggers
		// in the volume swept from the previous position to the current position
		UTIL_SetOrigin(GetOuter(), moveTrace.vEndPosition, true);
		
		// skip tiny steps, but notify the shadow object of any large steps
		if ( moveTrace.flStepUpDistance > 0.1f )
		{
			float height = clamp( moveTrace.flStepUpDistance, 0, StepHeight() );
			IPhysicsObject *pPhysicsObject = GetOuter()->VPhysicsGetObject();
			if ( pPhysicsObject )
			{
				IPhysicsShadowController *pShadow = pPhysicsObject->GetShadowController();
				if ( pShadow )
				{
					pShadow->StepUp( height );
				}
			}
		}
		if ( yaw != -1 )
		{
			QAngle angles = GetLocalAngles();
			angles.y = yaw;
			SetLocalAngles( angles );
		}
		if ( bHitTarget )
			return AIM_PARTIAL_HIT_TARGET;
			
		if ( !bIsBlocked )
			return AIM_SUCCESS;
			
		if ( moveTrace.fStatus == AIMR_BLOCKED_NPC )
			return AIM_PARTIAL_HIT_NPC;

		return AIM_PARTIAL_HIT_WORLD;
	}
	return AIM_FAILED;
}

//-----------------------------------------------------------------------------
// Purpose: 
//-----------------------------------------------------------------------------
bool CPropJeep::CheckWater( void )
{
	bool bInWater = false;

	// Check all four wheels.
	for ( int iWheel = 0; iWheel < JEEP_WHEEL_COUNT; ++iWheel )
	{
		// Get the current wheel and get its contact point.
		IPhysicsObject *pWheel = m_VehiclePhysics.GetWheel( iWheel );
		if ( !pWheel )
			continue;

		// Check to see if we hit water.
		if ( pWheel->GetContactPoint( &m_WaterData.m_vecWheelContactPoints[iWheel], NULL ) )
		{
			m_WaterData.m_bWheelInWater[iWheel] = ( UTIL_PointContents( m_WaterData.m_vecWheelContactPoints[iWheel] ) & MASK_WATER ) ? true : false;
			if ( m_WaterData.m_bWheelInWater[iWheel] )
			{
				bInWater = true;
			}
		}
	}

	// Check the body and the BONNET.
	int iEngine = LookupAttachment( "vehicle_engine" );
	Vector vecEnginePoint;
	QAngle vecEngineAngles;
	GetAttachment( iEngine, vecEnginePoint, vecEngineAngles );

	m_WaterData.m_bBodyInWater = ( UTIL_PointContents( vecEnginePoint ) & MASK_WATER ) ? true : false;
	if ( m_WaterData.m_bBodyInWater )
	{
		if ( m_bHasPoop )
		{
			RemoveAllDecals();
			m_bHasPoop = false;
		}

		if ( !m_VehiclePhysics.IsEngineDisabled() )
		{
			m_VehiclePhysics.SetDisableEngine( true );
		}
	}
	else
	{
		if ( m_VehiclePhysics.IsEngineDisabled() )
		{
			m_VehiclePhysics.SetDisableEngine( false );
		}
	}

	if ( bInWater )
	{
		// Check the player's water level.
		CheckWaterLevel();
	}

	return bInWater;
}

//-----------------------------------------------------------------------------
// Purpose: Input handler for waking up the cannister if it is sleeping.
//-----------------------------------------------------------------------------
void CPhysicsCannister::InputWake( inputdata_t &data )
{
	IPhysicsObject *pPhys = VPhysicsGetObject();
	if ( pPhys != NULL )
	{
		pPhys->Wake();
	}
}

void CTripwireHook::SetVelocity( const Vector &velocity, const AngularImpulse &angVelocity )
{
	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();
	if ( pPhysicsObject )
	{
		pPhysicsObject->AddVelocity( &velocity, &angVelocity );
	}
}

void CGETKnife::SetVelocity( const Vector &velocity, const AngularImpulse &angVelocity )
{
	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();
	if ( pPhysicsObject )
	{
		pPhysicsObject->SetVelocityInstantaneous( &velocity, &angVelocity );
	}
}

	void CBaseGrenadeProjectile::SetVelocity( const Vector &velocity, const AngularImpulse &angVelocity )
	{
		IPhysicsObject *pPhysicsObject = VPhysicsGetObject();
		if ( pPhysicsObject )
		{
			pPhysicsObject->AddVelocity( &velocity, &angVelocity );
		}
	}

void CRagdollPropAttached::InitRagdollAttached( IPhysicsObject *pAttached, const Vector &forceVector, int forceBone, matrix3x4_t *pPrevBones, matrix3x4_t *pBoneToWorld, float dt, int collisionGroup, CBaseAnimating *pFollow, int boneIndexRoot, const Vector &boneLocalOrigin, int parentBoneAttach, const Vector &worldAttachOrigin )
{
	int ragdollAttachedIndex = 0;
	if ( parentBoneAttach > 0 )
	{
		studiohdr_t *pStudioHdr = GetModelPtr();
		mstudiobone_t *pBone = pStudioHdr->pBone( parentBoneAttach );
		ragdollAttachedIndex = pBone->physicsbone;
	}

	InitRagdoll( forceVector, forceBone, vec3_origin, pPrevBones, pBoneToWorld, dt, collisionGroup, false );
	
	IPhysicsObject *pRefObject = m_ragdoll.list[ragdollAttachedIndex].pObject;

	Vector attachmentPointRagdollSpace;
	pRefObject->WorldToLocal( attachmentPointRagdollSpace, worldAttachOrigin );

	constraint_ragdollparams_t constraint;
	constraint.Defaults();
	matrix3x4_t tmp, worldToAttached, worldToReference, constraintToWorld;

	Vector offsetWS;
	pAttached->LocalToWorld( offsetWS, boneLocalOrigin );

	AngleMatrix( QAngle(0, pFollow->GetAbsAngles().y, 0 ), offsetWS, constraintToWorld );

	constraint.axes[0].SetAxisFriction( -2, 2, 20 );
	constraint.axes[1].SetAxisFriction( 0, 0, 0 );
	constraint.axes[2].SetAxisFriction( -15, 15, 20 );
	
	pAttached->GetPositionMatrix( tmp );
	MatrixInvert( tmp, worldToAttached );

	pRefObject->GetPositionMatrix( tmp );
	MatrixInvert( tmp, worldToReference );

	ConcatTransforms( worldToReference, constraintToWorld, constraint.constraintToReference );
	ConcatTransforms( worldToAttached, constraintToWorld, constraint.constraintToAttached );

	// for now, just slam this to be the passed in value
	MatrixSetColumn( attachmentPointRagdollSpace, 3, constraint.constraintToReference );

	DisableCollisions( pAttached );
	m_pAttachConstraint = physenv->CreateRagdollConstraint( pRefObject, pAttached, m_ragdoll.pGroup, constraint );

	FollowEntity( pFollow );
	SetOwnerEntity( pFollow );
	RagdollActivate( m_ragdoll );

	Relink();
	m_boneIndexAttached = boneIndexRoot;
	m_ragdollAttachedObjectIndex = ragdollAttachedIndex;
	m_attachmentPointBoneSpace = boneLocalOrigin;
	
	Vector vTemp;
	MatrixGetColumn( constraint.constraintToReference, 3, vTemp );
	m_attachmentPointRagdollSpace = vTemp;
}