diff --git a/src/g_hexen/a_dragon.cpp b/src/g_hexen/a_dragon.cpp
index d33e7b07b..7b160a689 100644
--- a/src/g_hexen/a_dragon.cpp
+++ b/src/g_hexen/a_dragon.cpp
@@ -60,14 +60,14 @@ static void DragonSeek (AActor *actor, angle_t thresh, angle_t turnMax)
 	actor->velx = FixedMul (actor->Speed, finecosine[angle]);
 	actor->vely = FixedMul (actor->Speed, finesine[angle]);
 	dist = actor->AproxDistance (target) / actor->Speed;
-	if (actor->z+actor->height < target->z ||
-		target->z+target->height < actor->z)
+	if (actor->Top() < target->Z() ||
+		target->Top() < actor->Z())
 	{
 		if (dist < 1)
 		{
 			dist = 1;
 		}
-		actor->velz = (target->z - actor->z)/dist;
+		actor->velz = (target->Z() - actor->Z())/dist;
 	}
 	if (target->flags&MF_SHOOTABLE && pr_dragonseek() < 64)
 	{ // attack the destination mobj if it's attackable
@@ -252,11 +252,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFX2)
 	delay = 16+(pr_dragonfx2()>>3);
 	for (i = 1+(pr_dragonfx2()&3); i; i--)
 	{
-		fixed_t x = self->x+((pr_dragonfx2()-128)<<14);
-		fixed_t y = self->y+((pr_dragonfx2()-128)<<14);
-		fixed_t z = self->z+((pr_dragonfx2()-128)<<12);
+		fixedvec3 pos = self->Vec3Offset(
+			((pr_dragonfx2()-128)<<14),
+			((pr_dragonfx2()-128)<<14),
+			((pr_dragonfx2()-128)<<12));
 
-		mo = Spawn ("DragonExplosion", x, y, z, ALLOW_REPLACE);
+		mo = Spawn ("DragonExplosion", pos, ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->tics = delay+(pr_dragonfx2()&3)*i*2;
@@ -288,7 +289,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonPain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonCheckCrash)
 {
-	if (self->z <= self->floorz)
+	if (self->Z() <= self->floorz)
 	{
 		self->SetState (self->FindState ("Crash"));
 	}
diff --git a/src/g_hexen/a_fighterquietus.cpp b/src/g_hexen/a_fighterquietus.cpp
index 846b30281..ae6df183c 100644
--- a/src/g_hexen/a_fighterquietus.cpp
+++ b/src/g_hexen/a_fighterquietus.cpp
@@ -36,7 +36,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DropWeaponPieces)
 		const PClass *cls = j==0? p1 : j==1? p2 : p3;
 		if (cls)
 		{
-			AActor *piece = Spawn (cls, self->x, self->y, self->z, ALLOW_REPLACE);
+			AActor *piece = Spawn (cls, self->Pos(), ALLOW_REPLACE);
 			if (piece != NULL)
 			{
 				piece->velx = self->velx + finecosine[fineang];
@@ -112,10 +112,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordFlames)
 
 	for (i = 1+(pr_fswordflame()&3); i; i--)
 	{
-		fixed_t x = self->x+((pr_fswordflame()-128)<<12);
-		fixed_t y = self->y+((pr_fswordflame()-128)<<12);
-		fixed_t z = self->z+((pr_fswordflame()-128)<<11);
-		Spawn ("FSwordFlame", x, y, z, ALLOW_REPLACE);
+		fixedvec3 pos = self->Vec3Offset(
+			((pr_fswordflame()-128)<<12),
+			((pr_fswordflame()-128)<<12),
+			((pr_fswordflame()-128)<<11));
+		Spawn ("FSwordFlame", pos, ALLOW_REPLACE);
 	}
 }
 
diff --git a/src/g_hexen/a_firedemon.cpp b/src/g_hexen/a_firedemon.cpp
index c003dc21d..72981df97 100644
--- a/src/g_hexen/a_firedemon.cpp
+++ b/src/g_hexen/a_firedemon.cpp
@@ -32,7 +32,6 @@ static FRandom pr_firedemonsplotch ("FiredSplotch");
 void A_FiredSpawnRock (AActor *actor)
 {
 	AActor *mo;
-	int x,y,z;
 	const PClass *rtype;
 
 	switch (pr_firedemonrock() % 5)
@@ -55,10 +54,11 @@ void A_FiredSpawnRock (AActor *actor)
 			break;
 	}
 
-	x = actor->x + ((pr_firedemonrock() - 128) << 12);
-	y = actor->y + ((pr_firedemonrock() - 128) << 12);
-	z = actor->z + ( pr_firedemonrock() << 11);
-	mo = Spawn (rtype, x, y, z, ALLOW_REPLACE);
+	fixedvec3 pos = actor->Vec3Offset(
+		((pr_firedemonrock() - 128) << 12),
+		((pr_firedemonrock() - 128) << 12),
+		( pr_firedemonrock() << 11));
+	mo = Spawn (rtype, pos, ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = actor;
@@ -97,7 +97,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredRocks)
 DEFINE_ACTION_FUNCTION(AActor, A_SmBounce)
 {
 	// give some more velocity (x,y,&z)
-	self->z = self->floorz + FRACUNIT;
+	self->SetZ(self->floorz + FRACUNIT);
 	self->velz = (2*FRACUNIT) + (pr_smbounce() << 10);
 	self->velx = pr_smbounce()%3<<FRACBITS;
 	self->vely = pr_smbounce()%3<<FRACBITS;
@@ -134,13 +134,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 	if (self->threshold) self->threshold--;
 
 	// Float up and down
-	self->z += finesine[weaveindex << BOBTOFINESHIFT] * 8;
+	self->SetZ(self->Z() + finesine[weaveindex << BOBTOFINESHIFT] * 8);
 	self->special1 = (weaveindex + 2) & 63;
 
 	// Ensure it stays above certain height
-	if (self->z < self->floorz + (64*FRACUNIT))
+	if (self->Z() < self->floorz + (64*FRACUNIT))
 	{
-		self->z += 2*FRACUNIT;
+		self->SetZ(self->Z() + 2*FRACUNIT);
 	}
 
 	if(!self->target || !(self->target->flags&MF_SHOOTABLE))
@@ -219,14 +219,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredSplotch)
 {
 	AActor *mo;
 
-	mo = Spawn ("FireDemonSplotch1", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("FireDemonSplotch1", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velx = (pr_firedemonsplotch() - 128) << 11;
 		mo->vely = (pr_firedemonsplotch() - 128) << 11;
 		mo->velz = (pr_firedemonsplotch() << 10) + FRACUNIT*3;
 	}
-	mo = Spawn ("FireDemonSplotch2", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("FireDemonSplotch2", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velx = (pr_firedemonsplotch() - 128) << 11;
diff --git a/src/g_hexen/a_flechette.cpp b/src/g_hexen/a_flechette.cpp
index 1a9461ae8..47869c48a 100644
--- a/src/g_hexen/a_flechette.cpp
+++ b/src/g_hexen/a_flechette.cpp
@@ -51,10 +51,10 @@ bool AArtiPoisonBag1::Use (bool pickup)
 	angle_t angle = Owner->angle >> ANGLETOFINESHIFT;
 	AActor *mo;
 
-	mo = Spawn ("PoisonBag",
-		Owner->x+16*finecosine[angle],
-		Owner->y+24*finesine[angle], Owner->z-
-		Owner->floorclip+8*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn ("PoisonBag", Owner->Vec3Offset(
+		16*finecosine[angle],
+		24*finesine[angle], 
+		-Owner->floorclip+8*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = Owner;
@@ -79,10 +79,10 @@ bool AArtiPoisonBag2::Use (bool pickup)
 	angle_t angle = Owner->angle >> ANGLETOFINESHIFT;
 	AActor *mo;
 
-	mo = Spawn ("FireBomb",
-		Owner->x+16*finecosine[angle],
-		Owner->y+24*finesine[angle], Owner->z-
-		Owner->floorclip+8*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn ("FireBomb", Owner->Vec3Offset(
+		16*finecosine[angle],
+		24*finesine[angle], 
+		-Owner->floorclip+8*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = Owner;
@@ -106,8 +106,7 @@ bool AArtiPoisonBag3::Use (bool pickup)
 {
 	AActor *mo;
 
-	mo = Spawn("ThrowingBomb", Owner->x, Owner->y, 
-		Owner->z-Owner->floorclip+35*FRACUNIT + (Owner->player? Owner->player->crouchoffset : 0), ALLOW_REPLACE);
+	mo = Spawn("ThrowingBomb", Owner->PosPlusZ(-Owner->floorclip+35*FRACUNIT + (Owner->player? Owner->player->crouchoffset : 0)), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->angle = Owner->angle + (((pr_poisonbag()&7) - 4) << 24);
@@ -133,7 +132,7 @@ bool AArtiPoisonBag3::Use (bool pickup)
 		mo->velz = FixedMul(speed, finesine[modpitch]);
 		mo->velx = FixedMul(xyscale, finecosine[angle]) + (Owner->velx >> 1);
 		mo->vely = FixedMul(xyscale, finesine[angle]) + (Owner->vely >> 1);
-		mo->z += FixedMul(mo->Speed, finesine[orgpitch]);
+		mo->SetZ(mo->Z() + FixedMul(mo->Speed, finesine[orgpitch]));
 
 		mo->target = Owner;
 		mo->tics -= pr_poisonbag()&3;
@@ -159,7 +158,7 @@ bool AArtiPoisonBagGiver::Use (bool pickup)
 	const PClass *MissileType = PClass::FindClass((ENamedName) this->GetClass()->Meta.GetMetaInt (ACMETA_MissileName, NAME_None));
 	if (MissileType != NULL)
 	{
-		AActor *mo = Spawn (MissileType, Owner->x, Owner->y, Owner->z, ALLOW_REPLACE);
+		AActor *mo = Spawn (MissileType, Owner->Pos(), ALLOW_REPLACE);
 		if (mo != NULL)
 		{
 			if (mo->IsKindOf(RUNTIME_CLASS(AInventory)))
@@ -385,7 +384,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagInit)
 {
 	AActor *mo;
 	
-	mo = Spawn<APoisonCloud> (self->x, self->y, self->z+28*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn<APoisonCloud> (self->PosPlusZ(28*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = self->target;
@@ -422,7 +421,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagDamage)
 	
 	P_RadiusAttack (self, self->target, 4, 40, self->DamageType, RADF_HURTSOURCE);
 	bobIndex = self->special2;
-	self->z += finesine[bobIndex << BOBTOFINESHIFT] >> 1;
+	self->SetZ(self->Z() + finesine[bobIndex << BOBTOFINESHIFT] >> 1);
 	self->special2 = (bobIndex + 1) & 63;
 }
 
@@ -456,7 +455,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb2)
 		< (3*3)/(2*2))
 	{
 		self->SetState (self->SpawnState + 6);
-		self->z = self->floorz;
+		self->SetZ(self->floorz);
 		self->velz = 0;
 		self->BounceFlags = BOUNCE_None;
 		self->flags &= ~MF_MISSILE;