diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index ea458d810..4a3b66355 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -932,7 +932,7 @@ void detonate(DDukeActor *actor, int explosion)
 		}
 	}
 
-	actor->spr.pos.Z -= (32 << 8);
+	actor->add_int_z(-(32 << 8));
 
 	if ((actor->temp_data[3] == 1 && actor->spr.xrepeat) || actor->spr.lotag == -99)
 	{
diff --git a/source/games/duke/src/player.cpp b/source/games/duke/src/player.cpp
index c08eea8b9..c38b341ed 100644
--- a/source/games/duke/src/player.cpp
+++ b/source/games/duke/src/player.cpp
@@ -559,7 +559,7 @@ void playerisdead(int snum, int psectlotag, int fz, int cz)
 		{
 			SetPlayerPal(p, PalEntry(63, 63, 0, 0));
 			p->pos.Z -= (16 << 8);
-			actor->spr.pos.Z -= (16 << 8);
+			actor->add_int_z(-(16 << 8));
 		}
 #if 0
 		if (ud.recstat == 1 && ud.multimode < 2)
diff --git a/source/games/duke/src/player_w.cpp b/source/games/duke/src/player_w.cpp
index 707ffa972..4c1f0f23f 100644
--- a/source/games/duke/src/player_w.cpp
+++ b/source/games/duke/src/player_w.cpp
@@ -128,7 +128,7 @@ void DoSpawn(struct player_struct *p, int snum)
 		j->spr.ang += 1024;
 		j->spr.ang &= 2047;
 		j->spr.xvel += 32;
-		j->spr.pos.Z += (3<<8);
+		j->add_int_z(3<<8);
 		ssp(j,CLIPMASK0);
 	}
 
@@ -361,7 +361,7 @@ void operateweapon_ww(int snum, ESyncBits actions)
 				if (k == 15)
 				{
 					j->spr.yvel = 3;
-					j->spr.pos.Z += (8 << 8);
+					j->add_int_z(8 << 8);
 				}
 
 				k = hits(p->GetActor());
diff --git a/source/games/duke/src/sectors_d.cpp b/source/games/duke/src/sectors_d.cpp
index 916443e19..027b8d9bb 100644
--- a/source/games/duke/src/sectors_d.cpp
+++ b/source/games/duke/src/sectors_d.cpp
@@ -199,7 +199,7 @@ void operaterespawns_d(int low)
 			auto star = spawn(act, TRANSPORTERSTAR);
 			if (star)
 			{
-				star->spr.pos.Z -= (32 << 8);
+				star->add_int_z(-(32 << 8));
 
 				act->spr.extra = 66 - 12;   // Just a way to killit
 			}
@@ -1221,7 +1221,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 		if (targ->spr.cstat & CSTAT_SPRITE_BLOCK)
 		{
 			S_PlayActorSound(GLASS_BREAKING, targ);
-			targ->spr.pos.Z += 16 << 8;
+			targ->add_int_z(16 << 8);
 			targ->spr.cstat = 0;
 			lotsofglass(targ, nullptr, 5);
 		}
@@ -1288,7 +1288,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 		}
 		{
 			auto spawned = spawn(targ, STEAM);
-			if (spawned) spawned->spr.pos.Z = targ->sector()->floorz - (32 << 8);
+			if (spawned) spawned->set_int_z(targ->sector()->floorz - (32 << 8));
 		}
 		break;
 
@@ -1374,7 +1374,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 							{
 								if (proj->spr.pal == 6)
 									spawned->spr.pal = 6;
-								spawned->spr.pos.Z += (4 << 8);
+								spawned->add_int_z(4 << 8);
 								spawned->spr.xvel = 16;
 								spawned->spr.xrepeat = spawned->spr.yrepeat = 24;
 								spawned->spr.ang += 32 - (krand() & 63);
@@ -1398,7 +1398,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 						targ->spr.ang = (proj->spr.ang + 1024) & 2047;
 					targ->spr.xvel = -(proj->spr.extra << 2);
 					auto sp = targ->sector();
-					pushmove(&targ->spr.pos, &sp, 128L, (4 << 8), (4 << 8), CLIPMASK0);
+					pushmove(targ, &sp, 128L, (4 << 8), (4 << 8), CLIPMASK0);
 					if (sp != targ->sector() && sp != nullptr)
 						ChangeActorSect(targ, sp);
 				}
diff --git a/source/games/duke/src/sectors_r.cpp b/source/games/duke/src/sectors_r.cpp
index 85ec558c2..d6bc1a68c 100644
--- a/source/games/duke/src/sectors_r.cpp
+++ b/source/games/duke/src/sectors_r.cpp
@@ -313,7 +313,7 @@ void operaterespawns_r(int low)
 			if (badguypic(act->spr.hitag) && ud.monsters_off) break;
 
 			auto star = spawn(act, TRANSPORTERSTAR);
-			if (star) star->spr.pos.Z -= (32 << 8);
+			if (star) star->add_int_z(-(32 << 8));
 
 			act->spr.extra = 66 - 12;   // Just a way to killit
 			break;
@@ -2284,7 +2284,7 @@ void checkhitsprite_r(DDukeActor* targ, DDukeActor* proj)
 		}
 		{
 			auto spawned = spawn(targ, STEAM);
-			if (spawned) spawned->spr.pos.Z = targ->sector()->floorz - (32 << 8);
+			if (spawned) spawned->set_int_z(targ->sector()->floorz - (32 << 8));
 		}
 		break;
 
@@ -2330,7 +2330,7 @@ void checkhitsprite_r(DDukeActor* targ, DDukeActor* proj)
 							{
 								if (proj->spr.pal == 6)
 									spawned->spr.pal = 6;
-								spawned->spr.pos.Z += (4 << 8);
+								spawned->add_int_z(4 << 8);
 								spawned->spr.xvel = 16;
 								spawned->spr.xrepeat = spawned->spr.yrepeat = 24;
 								spawned->spr.ang += 32 - (krand() & 63);
diff --git a/source/games/duke/src/spawn.cpp b/source/games/duke/src/spawn.cpp
index cf43477e5..b376d430d 100644
--- a/source/games/duke/src/spawn.cpp
+++ b/source/games/duke/src/spawn.cpp
@@ -317,7 +317,7 @@ void spawntransporter(DDukeActor *actj, DDukeActor* act, bool beam)
 			act->spr.xrepeat = 48;
 			act->spr.yrepeat = 64;
 			if (actj->spr.statnum == 10 || badguy(actj))
-				act->spr.pos.Z -= (32 << 8);
+				act->add_int_z(-(32 << 8));
 		}
 	}
 
diff --git a/source/games/duke/src/spawn_r.cpp b/source/games/duke/src/spawn_r.cpp
index 4630fe091..961516385 100644
--- a/source/games/duke/src/spawn_r.cpp
+++ b/source/games/duke/src/spawn_r.cpp
@@ -212,11 +212,11 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 		{
 			if (actj->sector()->lotag == 2)
 			{
-				act->spr.pos.Z = getceilzofslopeptr(act->sector(), act->spr.pos.X, act->spr.pos.Y) + (16 << 8);
+				act->set_int_z(getceilzofslopeptr(act->sector(), act->spr.pos.X, act->spr.pos.Y) + (16 << 8));
 				act->spr.cstat |= CSTAT_SPRITE_YFLIP;
 			}
 			else if (actj->sector()->lotag == 1)
-				act->spr.pos.Z = getflorzofslopeptr(act->sector(), act->spr.pos.X, act->spr.pos.Y);
+				act->set_int_z(getflorzofslopeptr(act->sector(), act->spr.pos.X, act->spr.pos.Y));
 		}
 
 		if (sectp->floorpicnum == FLOORSLIME ||
@@ -284,7 +284,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 	case TONGUE:
 		if (actj)
 			act->spr.ang = actj->spr.ang;
-		act->spr.pos.Z -= PHEIGHT_RR;
+		act->add_int_z(-PHEIGHT_RR);
 		act->spr.zvel = 256 - (krand() & 511);
 		act->spr.xvel = 64 - (krand() & 127);
 		ChangeActorStat(act, 4);
@@ -324,7 +324,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 
 	case BLOOD:
 		act->spr.xrepeat = act->spr.yrepeat = 4;
-		act->spr.pos.Z -= (26 << 8);
+		act->add_int_z(-(26 << 8));
 		ChangeActorStat(act, STAT_MISC);
 		break;
 	case BLOODPOOL:
@@ -353,7 +353,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 		act->spr.cstat |= CSTAT_SPRITE_ALIGNMENT_WALL;
 		act->spr.xrepeat = 7 + (krand() & 7);
 		act->spr.yrepeat = 7 + (krand() & 7);
-		act->spr.pos.Z -= (16 << 8);
+		act->add_int_z(-(16 << 8));
 		if (actj && actj->spr.pal == 6)
 			act->spr.pal = 6;
 		insertspriteq(act);
@@ -554,7 +554,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 		if (act->spr.picnum == RESPAWNMARKERRED)
 		{
 			act->spr.xrepeat = act->spr.yrepeat = 8;
-			if (actj) act->spr.pos.Z = actj->floorz;
+			if (actj) act->set_int_z(actj->floorz);
 		}
 		else
 		{
@@ -651,7 +651,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 		{
 			int x = getflorzofslopeptr(act->sector(), act->spr.pos.X, act->spr.pos.Y);
 			if (act->spr.pos.Z > x - (12 << 8))
-				act->spr.pos.Z = x - (12 << 8);
+				act->set_int_z(x - (12 << 8));
 		}
 
 		ChangeActorStat(act, STAT_MISC);
@@ -684,7 +684,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 	}
 	case WATERBUBBLE:
 		if (actj && actj->spr.picnum == APLAYER)
-			act->spr.pos.Z -= (16 << 8);
+			act->add_int_z(-(16 << 8));
 		if (act->spr.picnum == WATERBUBBLE)
 		{
 			if (actj)
@@ -905,9 +905,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 			act->spr.yrepeat = 64;
 			act->spr.cstat = CSTAT_SPRITE_TRANSLUCENT;
 			act->spr.cstat |= CSTAT_SPRITE_TRANS_FLIP;
-			act->spr.pos.X += (krand() & 2047) - 1024;
-			act->spr.pos.Y += (krand() & 2047) - 1024;
-			act->spr.pos.Z += (krand() & 2047) - 1024;
+			act->add_int_pos({ (krand() & 2047) - 1024, (krand() & 2047) - 1024, (krand() & 2047) - 1024 });
 			break;
 		case MAMA:
 			if (act->spr.pal == 30)
@@ -1157,7 +1155,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 			act->spr.lotag = 0;
 			if (act->spr.picnum != BOWLINGBALLSPRITE)
 			{
-				act->spr.pos.Z -= (32 << 8);
+				act->add_int_z(-(32 << 8));
 				act->spr.zvel = -(4 << 8);
 			}
 			else