diff --git a/source/core/coreactor.h b/source/core/coreactor.h
index 17e1bee79..6df662343 100644
--- a/source/core/coreactor.h
+++ b/source/core/coreactor.h
@@ -116,6 +116,10 @@ public:
 		return spr. zvel;
 	}
 
+	void set_int_zvel(int v)
+	{
+		spr. zvel = v;
+	}
 	// Same as above but with inverted y and z axes to match the renderer's coordinate system.
 
 	double interpolatedx(double const smoothratio, int const scale = 16)
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 4adb1ac3b..6f7b5a5bf 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -784,7 +784,7 @@ void movecrane(DDukeActor *actor, int crane)
 
 			Owner->opos = actor->spr.pos;
 
-			actor->spr.zvel = 0;
+			actor->set_int_zvel(0);
 		}
 		else if (actor->IsActiveCrane())
 		{
@@ -4857,7 +4857,7 @@ void makeitfall(DDukeActor* actor)
 	if (actor->spr.pos.Z >= actor->floorz - FOURSLEIGHT_F)
 	{
  		actor->spr.pos.Z = actor->floorz - FOURSLEIGHT_F;
-		actor->spr.zvel = 0;
+		actor->set_int_zvel(0);
 	}
 }
 
@@ -5114,7 +5114,7 @@ void fall_common(DDukeActor *actor, int playernum, int JIBS6, int DRONE, int BLO
 
 					actor->attackertype = SHOTSPARK1;
 					actor->hitextra = 1;
-					actor->spr.zvel = 0;
+					actor->set_int_zvel(0);
 				}
 				else if (actor->int_zvel() > 2048 && actor->sector()->lotag != 1)
 				{
@@ -5129,7 +5129,7 @@ void fall_common(DDukeActor *actor, int playernum, int JIBS6, int DRONE, int BLO
 			}
 			if (actor->sector()->lotag == 1)
 				actor->add_int_z(gs.actorinfo[actor->spr.picnum].falladjustz);
-			else actor->spr.zvel = 0;
+			else actor->set_int_zvel(0);
 		}
 	}
 }
diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 36a0ffa75..2026b4703 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -1605,7 +1605,7 @@ static void weaponcommon_d(DDukeActor* proj)
 				return;
 			}
 			proj->spr.xvel = 0;
-			proj->spr.zvel = 0;
+			proj->set_int_zvel(0);
 		}
 
 		bool fireball = (isWorldTour() && proj->spr.picnum == FIREBALL && (!proj->GetOwner() || proj->GetOwner()->spr.picnum != FIREBALL));
@@ -2349,7 +2349,7 @@ static void greenslime(DDukeActor *actor)
 
 		if (actor->temp_data[0] == 2)
 		{
-			actor->spr.zvel = 0;
+			actor->set_int_zvel(0);
 			actor->spr.cstat &= ~CSTAT_SPRITE_YFLIP;
 
 			if ((sectp->ceilingstat & CSTAT_SECTOR_SKY) || (actor->ceilingz + 24) < actor->spr.pos.Z)
@@ -2388,7 +2388,7 @@ static void greenslime(DDukeActor *actor)
 		if (rnd(4) && (sectp->ceilingstat & CSTAT_SECTOR_SKY) == 0 &&
 			fabs(actor->floorz - actor->ceilingz) < 192)
 		{
-			actor->spr.zvel = 0;
+			actor->set_int_zvel(0);
 			actor->temp_data[0]++;
 		}
 
@@ -2501,7 +2501,8 @@ static void flamethrowerflame(DDukeActor *actor)
 	}
 
 	if (coll.type != 0) {
-		actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+		actor->spr.xvel = actor->spr.yvel = 0;
+		actor->set_int_zvel(0);
 		if (coll.type == kHitSprite)
 		{
 			fi.checkhitsprite(coll.actor(), actor);
@@ -2591,7 +2592,7 @@ static void heavyhbomb(DDukeActor *actor)
 		if (actor->spr.pos.Z < actor->ceilingz) // && sectp->lotag != 2 )
 		{
 			actor->spr.pos.Z = actor->ceilingz + 3;
-			actor->spr.zvel = 0;
+			actor->set_int_zvel(0);
 		}
 	}
 
@@ -3579,13 +3580,13 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 					if (actor->spr.pos.Z > f - 8)
 					{
 						actor->spr.pos.Z = f - 8;
-						actor->spr.zvel = 0;
+						actor->set_int_zvel(0);
 					}
 
 					if (actor->spr.pos.Z < c + 80)
 					{
 						actor->spr.pos.Z = c + 80;
-						actor->spr.zvel = 0;
+						actor->set_int_zvel(0);
 					}
 				}
 				else
@@ -3604,7 +3605,7 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 						if (actor->spr.pos.Z < c + 50)
 						{
 							actor->spr.pos.Z = c + 50;
-							actor->spr.zvel = 0;
+							actor->set_int_zvel(0);
 						}
 					}
 				}
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 1946cf4eb..c106b61f3 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -2370,7 +2370,7 @@ static void heavyhbomb(DDukeActor *actor)
 	if (actor->spr.picnum != CHEERBOMB && actor->spr.pos.Z < actor->ceilingz + 16 && sectp->lotag != 2)
 	{
 		actor->spr.pos.Z = actor->ceilingz + 16;
-		actor->spr.zvel = 0;
+		actor->set_int_zvel(0);
 	}
 
 	Collision coll;
@@ -3654,7 +3654,7 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 					if (actor->spr.pos.Z < c + 50)
 					{
 						actor->spr.pos.Z = c + 50;
-						actor->spr.zvel = 0;
+						actor->set_int_zvel(0);
 					}
 				}
 			}
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index 15e9c3c60..255bd9493 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -1065,7 +1065,7 @@ void shoot_d(DDukeActor* actor, int atwith)
 				k->spr.pos = spos;
 				k->spr.angle = sang;
 				k->spr.xvel = 500;
-				k->spr.zvel = 0;
+				k->set_int_zvel(0);
 			}
 			return;
 		}
diff --git a/source/games/duke/src/spawn_d.cpp b/source/games/duke/src/spawn_d.cpp
index 495b53aa4..8a96260ed 100644
--- a/source/games/duke/src/spawn_d.cpp
+++ b/source/games/duke/src/spawn_d.cpp
@@ -900,7 +900,7 @@ DDukeActor* spawninit_d(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 		}
 
 		if (act->spr.picnum == ROTATEGUN)
-			act->spr.zvel = 0;
+			act->set_int_zvel(0);
 
 		break;
 
diff --git a/source/games/duke/src/spawn_r.cpp b/source/games/duke/src/spawn_r.cpp
index 47673cd3c..2c5cf92c9 100644
--- a/source/games/duke/src/spawn_r.cpp
+++ b/source/games/duke/src/spawn_r.cpp
@@ -1160,7 +1160,7 @@ DDukeActor* spawninit_r(DDukeActor* actj, DDukeActor* act, TArray<DDukeActor*>*
 			}
 			else
 			{
-				act->spr.zvel = 0;
+				act->set_int_zvel(0);
 			}
 			ssp(act, CLIPMASK0);
 			act->spr.cstat = randomXFlip();
diff --git a/source/games/exhumed/src/anims.cpp b/source/games/exhumed/src/anims.cpp
index 838e2cae6..f8b01683c 100644
--- a/source/games/exhumed/src/anims.cpp
+++ b/source/games/exhumed/src/anims.cpp
@@ -88,7 +88,7 @@ DExhumedActor* BuildAnim(DExhumedActor* pActor, int val, int val2, const DVector
     pActor->spr.yoffset = 0;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->backuppos();
 
     // CHECKME - where is hitag set otherwise?
diff --git a/source/games/exhumed/src/anubis.cpp b/source/games/exhumed/src/anubis.cpp
index f60ae27ce..740f3c31f 100644
--- a/source/games/exhumed/src/anubis.cpp
+++ b/source/games/exhumed/src/anubis.cpp
@@ -70,7 +70,7 @@ void BuildAnubis(DExhumedActor* ap, const DVector3& pos, sectortype* pSector, in
     ap->spr.yrepeat = 40;
     ap->spr.xvel = 0;
     ap->spr.yvel = 0;
-    ap->spr.zvel = 0;
+    ap->set_int_zvel(0);
     ap->spr.hitag = 0;
     ap->spr.lotag = runlist_HeadRun() + 1;
     ap->spr.extra = -1;
@@ -415,7 +415,7 @@ void AIAnubis::Damage(RunListEvent* ev)
             // he ded.
             ap->spr.xvel = 0;
             ap->spr.yvel = 0;
-            ap->spr.zvel = 0;
+            ap->set_int_zvel(0);
 			ap->spr.pos.Z = ap->sector()->floorz;
             ap->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
diff --git a/source/games/exhumed/src/bullet.cpp b/source/games/exhumed/src/bullet.cpp
index 4056a7085..472c7ed95 100644
--- a/source/games/exhumed/src/bullet.cpp
+++ b/source/games/exhumed/src/bullet.cpp
@@ -620,7 +620,7 @@ DExhumedActor* BuildBullet(DExhumedActor* pActor, int nType, int nZOffset, int n
     pBulletActor->set_int_ang(nAngle);
     pBulletActor->spr.xvel = 0;
     pBulletActor->spr.yvel = 0;
-    pBulletActor->spr.zvel = 0;
+    pBulletActor->set_int_zvel(0);
     pBulletActor->spr.lotag = runlist_HeadRun() + 1;
     pBulletActor->spr.extra = -1;
     pBulletActor->spr.hitag = 0;
diff --git a/source/games/exhumed/src/fish.cpp b/source/games/exhumed/src/fish.cpp
index 6922bc448..7a47c04bc 100644
--- a/source/games/exhumed/src/fish.cpp
+++ b/source/games/exhumed/src/fish.cpp
@@ -106,7 +106,7 @@ void AIFishLimb::Tick(RunListEvent* ev)
 
         if ((pActor->spr.pos.Z - FloorZ) > 100)
         {
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             runlist_DoSubRunRec(pActor->spr.intowner);
             runlist_FreeRun(pActor->spr.lotag - 1);
             runlist_SubRunRec(pActor->spr.hitag);
@@ -162,7 +162,7 @@ void BuildFish(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->spr.picnum = seq_GetSeqPicnum(kSeqFish, FishSeq[0].a, 0);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->set_int_ang(nAngle);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
diff --git a/source/games/exhumed/src/grenade.cpp b/source/games/exhumed/src/grenade.cpp
index 3a5c520c2..0d2929fd1 100644
--- a/source/games/exhumed/src/grenade.cpp
+++ b/source/games/exhumed/src/grenade.cpp
@@ -116,7 +116,7 @@ void BuildGrenade(int nPlayer)
     pActor->spr.intowner = nPlayer;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.hitag = 0;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
@@ -306,7 +306,7 @@ void AIGrenade::Tick(RunListEvent* ev)
                     D3PlayFX(StaticSound[kSound5], pActor);
                     pActor->nCount = 0;
                     pActor->nHealth = 0;
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                     pActor->nIndex = 1;
                 }
             }
diff --git a/source/games/exhumed/src/items.cpp b/source/games/exhumed/src/items.cpp
index db5fee32f..6ce2c90b5 100644
--- a/source/games/exhumed/src/items.cpp
+++ b/source/games/exhumed/src/items.cpp
@@ -416,7 +416,7 @@ void DoRegenerates()
             }
         }
 
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         pActor->spr.yrepeat = (uint8_t)pActor->spr.xvel;
         pActor->spr.xrepeat = (uint8_t)pActor->spr.xvel;
         pActor->spr.pal  = (uint8_t)pActor->spr.yvel;
diff --git a/source/games/exhumed/src/lavadude.cpp b/source/games/exhumed/src/lavadude.cpp
index d8f850c38..c46fcfb13 100644
--- a/source/games/exhumed/src/lavadude.cpp
+++ b/source/games/exhumed/src/lavadude.cpp
@@ -79,7 +79,7 @@ void AILavaDudeLimb::Tick(RunListEvent* ev)
     {
         pActor->spr.xvel = 0;
         pActor->spr.yvel = 0;
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
 
         runlist_DoSubRunRec(pActor->spr.intowner);
         runlist_FreeRun(pActor->spr.lotag - 1);
@@ -124,7 +124,7 @@ void BuildLava(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->spr.picnum = seq_GetSeqPicnum(kSeqLavag, LavadudeSeq[3].a, 0);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->set_int_ang(nAngle);
     pActor->spr.hitag = 0;
     pActor->spr.lotag = runlist_HeadRun() + 1;
diff --git a/source/games/exhumed/src/lion.cpp b/source/games/exhumed/src/lion.cpp
index 2785e9f52..4044b455e 100644
--- a/source/games/exhumed/src/lion.cpp
+++ b/source/games/exhumed/src/lion.cpp
@@ -67,7 +67,7 @@ void BuildLion(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->set_int_ang(nAngle);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
     pActor->spr.extra = -1;
@@ -121,7 +121,7 @@ void AILion::Damage(RunListEvent* ev)
             // R.I.P.
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             pActor->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
             pActor->nHealth = 0;
diff --git a/source/games/exhumed/src/move.cpp b/source/games/exhumed/src/move.cpp
index 400e9fd88..4a383d848 100644
--- a/source/games/exhumed/src/move.cpp
+++ b/source/games/exhumed/src/move.cpp
@@ -295,7 +295,7 @@ int BelowNear(DExhumedActor* pActor, double walldist)
     {
         pActor->set_int_z(z2);
         overridesect = pSector;
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
 
         bTouchFloor = true;
 
@@ -412,7 +412,7 @@ Collision movespritez(DExhumedActor* pActor, int z, int height, int, int clipdis
                         nRet = loHit;
                     }
 
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                 }
             }
             else
@@ -438,7 +438,7 @@ Collision movespritez(DExhumedActor* pActor, int z, int height, int, int clipdis
                         }
                     }
 
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                 }
             }
         }
@@ -589,14 +589,14 @@ void Gravity(DExhumedActor* pActor)
             {
                 pActor->spr.zvel -= 64;
                 if (pActor->int_zvel() < 0) {
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                 }
             }
             else if (pActor->int_zvel() < 0)
             {
                 pActor->spr.zvel += 64;
                 if (pActor->int_zvel() > 0) {
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                 }
             }
         }
@@ -1111,7 +1111,7 @@ Collision AngleChase(DExhumedActor* pActor, DExhumedActor* pActor2, int ebx, int
 
     if (pActor2 == nullptr)
     {
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         nAngle = pActor->int_ang();
     }
     else
@@ -1361,7 +1361,7 @@ void AICreatureChunk::Tick(RunListEvent* ev)
 
         pActor->spr.xvel = 0;
         pActor->spr.yvel = 0;
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         pActor->spr.pos.Z = pSector->floorz;
     }
     else
diff --git a/source/games/exhumed/src/mummy.cpp b/source/games/exhumed/src/mummy.cpp
index 989669260..2157beac9 100644
--- a/source/games/exhumed/src/mummy.cpp
+++ b/source/games/exhumed/src/mummy.cpp
@@ -55,7 +55,7 @@ void BuildMummy(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->spr.clipdist = 32;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.xrepeat = 42;
     pActor->spr.yrepeat = 42;
     pActor->spr.pal = pActor->sector()->ceilingpal;
@@ -442,7 +442,7 @@ void AIMummy::Damage(RunListEvent* ev)
 
         pActor->spr.xvel = 0;
         pActor->spr.yvel = 0;
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         pActor->spr.pos.Z = pActor->sector()->floorz;
     }
     else
diff --git a/source/games/exhumed/src/object.cpp b/source/games/exhumed/src/object.cpp
index fcbfa7e89..6b8c3027a 100644
--- a/source/games/exhumed/src/object.cpp
+++ b/source/games/exhumed/src/object.cpp
@@ -1204,7 +1204,7 @@ int BuildTrap(DExhumedActor* pActor, int edx, int ebx, int ecx)
     pActor->spr.cstat = CSTAT_SPRITE_INVISIBLE;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.extra = -1;
 
     pActor->spr.lotag = runlist_HeadRun() + 1;
@@ -1448,7 +1448,7 @@ void AISpark::Tick(RunListEvent* ev)
 
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
 
     if (pActor->spr.picnum > kTile3000) {
         nSmokeSparks--;
@@ -1585,7 +1585,7 @@ DExhumedActor* BuildEnergyBlock(sectortype* pSector)
     pActor->spr.cstat = CSTAT_SPRITE_INVISIBLE;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.extra = -1;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
@@ -1786,7 +1786,7 @@ DExhumedActor* BuildObject(DExhumedActor* pActor, int nOjectType, int nHitag)
     pActor->spr.cstat = (pActor->spr.cstat | CSTAT_SPRITE_BLOCK_ALL) & ~(CSTAT_SPRITE_TRANSLUCENT | CSTAT_SPRITE_INVISIBLE);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.extra = -1;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
@@ -2033,7 +2033,7 @@ void AIObject::RadialDamage(RunListEvent* ev)
         {
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
         }
         else if (pActor->spr.statnum != kStatAnubisDrum)
         {
diff --git a/source/games/exhumed/src/player.cpp b/source/games/exhumed/src/player.cpp
index 21830edf5..c44fb72b1 100644
--- a/source/games/exhumed/src/player.cpp
+++ b/source/games/exhumed/src/player.cpp
@@ -302,7 +302,7 @@ void RestartPlayer(int nPlayer)
 	int nHeight = GetActorHeight(pActor);
 	pActor->spr.xvel = 0;
 	pActor->spr.yvel = 0;
-	pActor->spr.zvel = 0;
+	pActor->set_int_zvel(0);
 
 	nStandHeight = nHeight;
 
@@ -925,7 +925,7 @@ void AIPlayer::Tick(RunListEvent* ev)
 
             pPlayerActor->spr.xvel = 0;
             pPlayerActor->spr.yvel = 0;
-            pPlayerActor->spr.zvel = 0;
+            pPlayerActor->set_int_zvel(0);
 
             if (nFreeze < 1)
             {
diff --git a/source/games/exhumed/src/queen.cpp b/source/games/exhumed/src/queen.cpp
index e02411900..4bbafe0db 100644
--- a/source/games/exhumed/src/queen.cpp
+++ b/source/games/exhumed/src/queen.cpp
@@ -290,7 +290,7 @@ Collision QueenAngleChase(DExhumedActor* pActor, DExhumedActor* pActor2, int val
 
     if (pActor2 == nullptr)
     {
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         nAngle = pActor->int_ang();
     }
     else
@@ -622,7 +622,7 @@ void AIQueenEgg::Tick(RunListEvent* ev)
             pActor->spr.zvel = -(pActor->spr.zvel - 256);
             if (pActor->int_zvel() < -512)
             {
-                pActor->spr.zvel = 0;
+                pActor->set_int_zvel(0);
             }
         }
 
@@ -802,7 +802,7 @@ void AIQueenHead::Tick(RunListEvent* ev)
                 if (pActor->int_zvel() > -256)
                 {
                     nVelShift = 100;
-                    pActor->spr.zvel = 0;
+                    pActor->set_int_zvel(0);
                 }
             }
 
@@ -1100,7 +1100,7 @@ void BuildQueen(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->set_int_ang(nAngle);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
     pActor->spr.hitag = 0;
@@ -1421,7 +1421,7 @@ void AIQueen::Damage(RunListEvent* ev)
         {
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
 
             QueenList[nQueen].nAction2++;
 
diff --git a/source/games/exhumed/src/ra.cpp b/source/games/exhumed/src/ra.cpp
index 1d766f0f6..2c6bcb676 100644
--- a/source/games/exhumed/src/ra.cpp
+++ b/source/games/exhumed/src/ra.cpp
@@ -92,7 +92,7 @@ void BuildRa(int nPlayer)
     pActor->spr.cstat = CSTAT_SPRITE_INVISIBLE;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.extra = -1;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
diff --git a/source/games/exhumed/src/rat.cpp b/source/games/exhumed/src/rat.cpp
index fef45e96d..1ad08fc6c 100644
--- a/source/games/exhumed/src/rat.cpp
+++ b/source/games/exhumed/src/rat.cpp
@@ -99,7 +99,7 @@ void BuildRat(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector, i
     pActor->spr.yrepeat = 50;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.hitag = 0;
     pActor->spr.extra = -1;
diff --git a/source/games/exhumed/src/rex.cpp b/source/games/exhumed/src/rex.cpp
index 4543de956..bc3f2795b 100644
--- a/source/games/exhumed/src/rex.cpp
+++ b/source/games/exhumed/src/rex.cpp
@@ -63,7 +63,7 @@ void BuildRex(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector, i
     pActor->set_int_ang(nAngle);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
     pActor->spr.hitag = 0;
@@ -124,7 +124,7 @@ void AIRex::Damage(RunListEvent* ev)
             {
                 pActor->spr.xvel = 0;
                 pActor->spr.yvel = 0;
-                pActor->spr.zvel = 0;
+                pActor->set_int_zvel(0);
                 pActor->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
                 pActor->nHealth = 0;
diff --git a/source/games/exhumed/src/roach.cpp b/source/games/exhumed/src/roach.cpp
index fdff70c0d..658204659 100644
--- a/source/games/exhumed/src/roach.cpp
+++ b/source/games/exhumed/src/roach.cpp
@@ -61,7 +61,7 @@ void BuildRoach(int nType, DExhumedActor* pActor, const DVector3& pos, sectortyp
     pActor->spr.yrepeat = 40;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.hitag = 0;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
@@ -132,7 +132,7 @@ void AIRoach::Damage(RunListEvent* ev)
         {
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             pActor->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
             pActor->nHealth = 0;
diff --git a/source/games/exhumed/src/scorp.cpp b/source/games/exhumed/src/scorp.cpp
index c5c97721a..cb3459efe 100644
--- a/source/games/exhumed/src/scorp.cpp
+++ b/source/games/exhumed/src/scorp.cpp
@@ -64,7 +64,7 @@ void BuildScorp(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector,
     pActor->set_int_ang(nAngle);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
     pActor->spr.hitag = 0;
@@ -129,7 +129,7 @@ void AIScorp::Damage(RunListEvent* ev)
 
         pActor->spr.xvel = 0;
         pActor->spr.yvel = 0;
-        pActor->spr.zvel = 0;
+        pActor->set_int_zvel(0);
         pActor->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
         nCreaturesKilled++;
diff --git a/source/games/exhumed/src/set.cpp b/source/games/exhumed/src/set.cpp
index 9a36b1d39..94abb74d3 100644
--- a/source/games/exhumed/src/set.cpp
+++ b/source/games/exhumed/src/set.cpp
@@ -58,7 +58,7 @@ void BuildSet(DExhumedActor* pActor, const DVector3& pos, sectortype* pSector, i
     pActor->spr.clipdist = 110;
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.xrepeat = 87;
     pActor->spr.yrepeat = 96;
     pActor->spr.pal = pActor->sector()->ceilingpal;
@@ -187,7 +187,7 @@ void AISet::Damage(RunListEvent* ev)
         {
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             pActor->spr.cstat &= ~CSTAT_SPRITE_BLOCK_ALL;
 
             pActor->nHealth = 0;
diff --git a/source/games/exhumed/src/snake.cpp b/source/games/exhumed/src/snake.cpp
index fb9a86fd5..99a2fbe28 100644
--- a/source/games/exhumed/src/snake.cpp
+++ b/source/games/exhumed/src/snake.cpp
@@ -217,7 +217,7 @@ void BuildSnake(int nPlayer, int zVal)
             pActor->spr.angle = pPlayerActor->spr.angle;
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             pActor->spr.hitag = 0;
             pActor->spr.extra = -1;
             pActor->spr.lotag = runlist_HeadRun() + 1;
diff --git a/source/games/exhumed/src/spider.cpp b/source/games/exhumed/src/spider.cpp
index 4ba6f414d..96bc3db86 100644
--- a/source/games/exhumed/src/spider.cpp
+++ b/source/games/exhumed/src/spider.cpp
@@ -56,7 +56,7 @@ DExhumedActor* BuildSpider(DExhumedActor* spp, const DVector3& pos, sectortype*
     spp->spr.clipdist = 15;
     spp->spr.xvel = 0;
     spp->spr.yvel = 0;
-    spp->spr.zvel = 0;
+    spp->set_int_zvel(0);
     spp->spr.xrepeat = 40;
     spp->spr.yrepeat = 40;
     spp->spr.pal = spp->sector()->ceilingpal;
@@ -174,7 +174,7 @@ void AISpider::Tick(RunListEvent* ev)
 
             if (spp->spr.cstat & CSTAT_SPRITE_YFLIP)
             {
-                spp->spr.zvel = 0;
+                spp->set_int_zvel(0);
                 spp->spr.pos.Z = pSector->ceilingz + (tileHeight(spp->spr.picnum) / 8.); // was << 5 in Build coordinates
 
                 if (pSector->ceilingstat & CSTAT_SECTOR_SKY)
@@ -287,7 +287,7 @@ void AISpider::Tick(RunListEvent* ev)
     {
         spp->spr.cstat |= CSTAT_SPRITE_YFLIP;
 		spp->spr.pos.Z = spp->sector()->ceilingz + GetActorHeightF(spp);
-        spp->spr.zvel = 0;
+        spp->set_int_zvel(0);
 
         spp->nAction = 1;
         spp->nFrame = 0;
diff --git a/source/games/exhumed/src/wasp.cpp b/source/games/exhumed/src/wasp.cpp
index dadc844b5..fda6fcd5c 100644
--- a/source/games/exhumed/src/wasp.cpp
+++ b/source/games/exhumed/src/wasp.cpp
@@ -76,7 +76,7 @@ DExhumedActor* BuildWasp(DExhumedActor* pActor, const DVector3& pos, sectortype*
     pActor->set_int_ang(nAngle);
     pActor->spr.xvel = 0;
     pActor->spr.yvel = 0;
-    pActor->spr.zvel = 0;
+    pActor->set_int_zvel(0);
     pActor->spr.hitag = 0;
     pActor->spr.lotag = runlist_HeadRun() + 1;
     pActor->spr.extra = -1;
@@ -242,7 +242,7 @@ void AIWasp::Tick(RunListEvent* ev)
             }
             else
             {
-                pActor->spr.zvel = 0;
+                pActor->set_int_zvel(0);
                 pActor->nAction = 1;
                 pActor->nFrame = 0;
                 pActor->nVel = 1500;
@@ -344,7 +344,7 @@ void AIWasp::Tick(RunListEvent* ev)
 
             pActor->spr.xvel = 0;
             pActor->spr.yvel = 0;
-            pActor->spr.zvel = 0;
+            pActor->set_int_zvel(0);
             pActor->nAction = 6;
             pActor->nFrame = 0;
             runlist_SubRunRec(pActor->nRun);
diff --git a/source/games/sw/src/jweapon.cpp b/source/games/sw/src/jweapon.cpp
index b5750d39b..cc13ecac8 100644
--- a/source/games/sw/src/jweapon.cpp
+++ b/source/games/sw/src/jweapon.cpp
@@ -1336,7 +1336,8 @@ int InitChemBomb(DSWActor* actor)
     if (actor->user.ID == MUSHROOM_CLOUD || actor->user.ID == 3121 || actor->user.ID == SUMO_RUN_R0) // 3121 == GRENADE_EXP
     {
 		actor->user.change.Zero();
-        actorNew->spr.xvel = actorNew->spr.yvel = actorNew->spr.zvel = 0;
+        actorNew->spr.xvel = actorNew->spr.yvel = 0;
+        actorNew->set_int_zvel(0);
         // Smoke will come out for this many seconds
         actorNew->user.WaitTics = 40*120;
     }
diff --git a/source/games/sw/src/miscactr.cpp b/source/games/sw/src/miscactr.cpp
index efc62f86b..e4ac3988f 100644
--- a/source/games/sw/src/miscactr.cpp
+++ b/source/games/sw/src/miscactr.cpp
@@ -131,7 +131,8 @@ int  SetupToiletGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 38;
     actor->spr.yrepeat = 32;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = TOILETGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = TOILETGIRL_R0;
@@ -189,7 +190,8 @@ int DoToiletGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -351,7 +353,8 @@ int SetupWashGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 28;
     actor->spr.yrepeat = 24;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = WASHGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = WASHGIRL_R0;
@@ -418,7 +421,8 @@ int DoWashGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -545,7 +549,8 @@ int SetupTrashCan(DSWActor* actor)
 
     actor->spr.xrepeat = 46;
     actor->spr.yrepeat = 42;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->user.ID = TRASHCAN;
 
     actor->user.Flags &= ~(SPR_XFLIP_TOGGLE);
@@ -565,7 +570,8 @@ int DoTrashCan(DSWActor* actor)
         KeepActorOnFloor(actor);
     }
 
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -636,7 +642,8 @@ int SetupPachinkoLight(DSWActor* actor)
     actor->user.RotNum = 0;
     actor->user.ID = PACHINKOLIGHT_R0;
 
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = TAG_PACHINKOLIGHT;
     actor->spr.shade = -2;
     actor->user.spal = actor->spr.pal;
@@ -726,7 +733,8 @@ int SetupPachinko1(DSWActor* actor)
     actor->user.RotNum = 0;
     actor->user.ID = PACHINKO1;
 
-    actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = PACHINKO1;
 
     actor->user.Flags &= ~(SPR_XFLIP_TOGGLE);
@@ -878,7 +886,8 @@ int SetupPachinko2(DSWActor* actor)
     actor->user.RotNum = 0;
     actor->user.ID = PACHINKO2;
 
-    actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = PACHINKO2;
 
     actor->user.Flags &= ~(SPR_XFLIP_TOGGLE);
@@ -954,7 +963,8 @@ int SetupPachinko3(DSWActor* actor)
     actor->user.RotNum = 0;
     actor->user.ID = PACHINKO3;
 
-    actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = PACHINKO3;
 
     actor->user.Flags &= ~(SPR_XFLIP_TOGGLE);
@@ -1031,7 +1041,7 @@ int SetupPachinko4(DSWActor* actor)
     actor->user.RotNum = 0;
     actor->user.ID = PACHINKO4;
 
-    actor->spr.yvel = actor->spr.zvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = PACHINKO4;
 
     actor->user.Flags &= ~(SPR_XFLIP_TOGGLE);
@@ -1138,7 +1148,8 @@ int SetupCarGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 29;
     actor->spr.yrepeat = 25;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = CARGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = CARGIRL_R0;
@@ -1188,7 +1199,8 @@ int DoCarGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -1339,7 +1351,8 @@ int SetupMechanicGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 27;
     actor->spr.yrepeat = 26;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = MECHANICGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = MECHANICGIRL_R0;
@@ -1388,7 +1401,8 @@ int DoMechanicGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -1539,7 +1553,8 @@ int SetupSailorGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 28;
     actor->spr.yrepeat = 26;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = SAILORGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = SAILORGIRL_R0;
@@ -1593,7 +1608,8 @@ int DoSailorGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
@@ -1733,7 +1749,8 @@ int SetupPruneGirl(DSWActor* actor)
 
     actor->spr.xrepeat = 33;
     actor->spr.yrepeat = 28;
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
     actor->spr.lotag = PRUNEGIRL_R0;
     actor->user.FlagOwner = 0;
     actor->user.ID = PRUNEGIRL_R0;
@@ -1798,7 +1815,8 @@ int DoPruneGirl(DSWActor* actor)
 
     // take damage from environment
     DoActorSectorDamage(actor);
-    actor->spr.xvel = actor->spr.yvel = actor->spr.zvel = 0;
+    actor->spr.xvel = actor->spr.yvel = 0;
+    actor->set_int_zvel(0);
 
     return 0;
 }
diff --git a/source/games/sw/src/track.cpp b/source/games/sw/src/track.cpp
index ede152c28..15fea3a4b 100644
--- a/source/games/sw/src/track.cpp
+++ b/source/games/sw/src/track.cpp
@@ -3250,7 +3250,7 @@ bool ActorTrackDecide(TRACK_POINT* tpoint, DSWActor* actor)
         {
             actor->user.Flags &= ~(SPR_ZDIFF_MODE);
             actor->spr.pos.Z = actor->sector()->floorz;
-            actor->spr.zvel = 0;
+            actor->set_int_zvel(0);
         }
         else
         {
@@ -3468,7 +3468,7 @@ int ActorFollowTrack(DSWActor* actor, short locktics)
             {
                 actor->user.Flags &= ~(SPR_CLIMBING);
 
-                actor->spr.zvel = 0;
+                actor->set_int_zvel(0);
 
                 actor->spr.angle = VecToAngle(tpoint->pos - actor->spr.pos);
 
diff --git a/source/games/sw/src/weapon.cpp b/source/games/sw/src/weapon.cpp
index 5bc1b81cb..f4b0a7790 100644
--- a/source/games/sw/src/weapon.cpp
+++ b/source/games/sw/src/weapon.cpp
@@ -10849,7 +10849,7 @@ int DoMirv(DSWActor* actor)
             actorNew->spr.xrepeat = 40;
             actorNew->spr.yrepeat = 40;
             actorNew->spr.clipdist = 32L >> 2;
-            actorNew->spr.zvel = 0;
+            actorNew->set_int_zvel(0);
             actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
 
             actorNew->user.ceiling_dist = (16);
@@ -11066,7 +11066,7 @@ void InitSpellRing(PLAYER* pp)
         actorNew->spr.shade = -40;
         actorNew->spr.xrepeat = 32;
         actorNew->spr.yrepeat = 32;
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
 
         actorNew->user.pos.Z = 20;
         actorNew->user.Dist = RING_INNER_DIST;
@@ -11226,7 +11226,7 @@ int InitLavaThrow(DSWActor* actor)
     actorNew->spr.yrepeat = 72;
     actorNew->spr.xrepeat = 72;
     actorNew->spr.shade = -15;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
 
     if (RANDOM_P2(1024) > 512)
@@ -13800,7 +13800,7 @@ int InitSerpSpell(DSWActor* actor)
         actorNew->spr.xrepeat = 64;
         actorNew->spr.yrepeat = 64;
         actorNew->spr.clipdist = 32L >> 2;
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
         actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
 
         actorNew->user.ceiling_dist = (16);
@@ -13891,7 +13891,7 @@ int InitSerpMonstSpell(DSWActor* actor)
         actorNew->spr.xrepeat = 122;
         actorNew->spr.yrepeat = 116;
         actorNew->spr.clipdist = 32L >> 2;
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
         actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
 
         actorNew->user.ceiling_dist = (16);
@@ -13957,7 +13957,7 @@ int InitEnemyRocket(DSWActor* actor)
     actorNew->spr.yrepeat = 28;
     actorNew->spr.xrepeat = 28;
     actorNew->spr.shade = -15;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
     actorNew->spr.clipdist = 64L>>2;
 
@@ -14026,7 +14026,7 @@ int InitEnemyRail(DSWActor* actor)
     actorNew->spr.yrepeat = 52;
     actorNew->spr.xrepeat = 52;
     actorNew->spr.shade = -15;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
 
     actorNew->user.RotNum = 5;
     NewStateGroup(actorNew, &sg_Rail[0]);
@@ -14085,7 +14085,7 @@ int InitZillaRocket(DSWActor* actor)
         actorNew->spr.yrepeat = 28;
         actorNew->spr.xrepeat = 28;
         actorNew->spr.shade = -15;
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
         actorNew->spr.angle = actor->spr.angle;
         actorNew->spr.clipdist = 64 >>2;
 
@@ -14136,7 +14136,7 @@ int InitEnemyStar(DSWActor* actor)
     actorNew->spr.yrepeat = 16;
     actorNew->spr.xrepeat = 16;
     actorNew->spr.shade = -25;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
     actorNew->spr.clipdist = 64L>>2;
 
@@ -14166,7 +14166,7 @@ int InitEnemyCrossbow(DSWActor* actor)
     actorNew->spr.xrepeat = 16;
     actorNew->spr.yrepeat = 26;
     actorNew->spr.shade = -25;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
     actorNew->spr.clipdist = 64>>2;
 
@@ -14203,7 +14203,7 @@ int InitSkelSpell(DSWActor* actor)
     actorNew->spr.xrepeat -= 20;
     actorNew->spr.yrepeat -= 20;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
     actorNew->spr.clipdist = 64L>>2;
     actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
@@ -14238,7 +14238,7 @@ int InitCoolgFire(DSWActor* actor)
     actorNew->spr.yrepeat = 18;
     actorNew->spr.xrepeat = 18;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.angle = actor->spr.angle;
     actorNew->spr.clipdist = 32>>2;
     actorNew->user.ceiling_dist = (4);
@@ -14286,7 +14286,7 @@ int InitCoolgDrip(DSWActor* actor)
     SetOwner(actor, actorNew);
     actorNew->spr.yrepeat = actorNew->spr.xrepeat = 20;
     actorNew->spr.shade = -5;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 16L>>2;
     actorNew->user.ceiling_dist = (4);
     actorNew->user.floor_dist = (4);
@@ -14319,7 +14319,7 @@ int GenerateDrips(DSWActor* actor)
         SetOwner(actor, actorNew);
         actorNew->spr.yrepeat = actorNew->spr.xrepeat = 20;
         actorNew->spr.shade = -10;
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
         actorNew->spr.clipdist = 16L>>2;
         actorNew->user.ceiling_dist = (4);
         actorNew->user.floor_dist = (4);
@@ -14381,7 +14381,7 @@ void InitFireballTrap(DSWActor* actor)
     actorNew->spr.yrepeat -= 20;
     actorNew->spr.shade = -40;
     actorNew->spr.clipdist = 32>>2;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
     actorNew->user.WeaponNum = WPN_HOTHEAD;
 
@@ -14401,7 +14401,7 @@ void InitBoltTrap(DSWActor* actor)
     actorNew->spr.yrepeat = 32;
     actorNew->spr.xrepeat = 32;
     actorNew->spr.shade = -15;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.cstat |= (CSTAT_SPRITE_YCENTER);
 
     actorNew->user.RotNum = 5;
@@ -14469,7 +14469,7 @@ int InitTracerUzi(PLAYER* pp)
     actorNew->spr.yrepeat = 10;
     actorNew->spr.xrepeat = 10;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     //actorNew->spr.zvel = -pp->horizon.horiz.asq16() >> 9;
     actorNew->spr.clipdist = 32 >> 2;
 
@@ -14529,7 +14529,7 @@ int InitTracerTurret(DSWActor* actor, DSWActor* Operator, fixed_t q16horiz)
     actorNew->spr.yrepeat = 10;
     actorNew->spr.xrepeat = 10;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 8 >> 2;
 
     actorNew->user.WeaponNum = actor->user.WeaponNum;
@@ -14565,7 +14565,7 @@ int InitTracerAutoTurret(DSWActor* actor, int xchange, int ychange, int zchange)
     actorNew->spr.yrepeat = 10;
     actorNew->spr.xrepeat = 10;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 8 >> 2;
 
     actorNew->user.WeaponNum = actor->user.WeaponNum;
@@ -14913,7 +14913,7 @@ int InitTankShell(DSWActor* actor, PLAYER* pp)
     actorNew->spr.yrepeat = 8;
     actorNew->spr.xrepeat = 8;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 32 >> 2;
 
     actorNew->user.WeaponNum = actor->user.WeaponNum;
@@ -15046,7 +15046,7 @@ int InitTurretRocket(DSWActor* actor, PLAYER* pp)
     actorNew->spr.yrepeat = 40;
     actorNew->spr.xrepeat = 40;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 32 >> 2;
 
     actorNew->user.WeaponNum = actor->user.WeaponNum;
@@ -15080,7 +15080,7 @@ int InitTurretFireball(DSWActor* actor, PLAYER* pp)
     actorNew->spr.yrepeat = 40;
     actorNew->spr.xrepeat = 40;
     actorNew->spr.shade = -40;
-    actorNew->spr.zvel = 0;
+    actorNew->set_int_zvel(0);
     actorNew->spr.clipdist = 32 >> 2;
 
     actorNew->user.WeaponNum = actor->user.WeaponNum;
@@ -16207,7 +16207,7 @@ int InitEnemyFireball(DSWActor* actor)
         actorNew->spr.shade = -40;
 
         SetOwner(actor, actorNew);
-        actorNew->spr.zvel = 0;
+        actorNew->set_int_zvel(0);
         actorNew->spr.clipdist = 16>>2;
 
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang() + lat_ang[i]));