diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 5c802da29..89265a4f1 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -2173,7 +2173,7 @@ static void greenslime(DDukeActor *actor)
 				return;
 			}
 
-		actor->spr.pos.Z = ps[p].pos.Z + 8 + (ps[p].pyoff - actor->temp_data[2] - (ps[p].horizon.horiz.asq16() >> 12)) * zinttoworld;
+		actor->spr.pos.Z = ps[p].pos.Z + 8 + ps[p].pyoff - (actor->temp_data[2] - (ps[p].horizon.horiz.asq16() >> 12)) * zinttoworld;
 
 		if (actor->temp_data[2] > 512)
 			actor->temp_data[2] -= 128;
diff --git a/source/games/duke/src/gameexec.cpp b/source/games/duke/src/gameexec.cpp
index 53788facd..226ddfa81 100644
--- a/source/games/duke/src/gameexec.cpp
+++ b/source/games/duke/src/gameexec.cpp
@@ -393,13 +393,13 @@ void DoPlayer(bool bSet, int lVar1, int lLabelID, int lVar2, DDukeActor* sActor,
 		break;
 
 	case PLAYER_PYOFF:
-		if (bSet) ps[iPlayer].pyoff = lValue;
-		else SetGameVarID(lVar2, ps[iPlayer].pyoff, sActor, sPlayer);
+		if (bSet) ps[iPlayer].pyoff = lValue * zmaptoworld;
+		else SetGameVarID(lVar2, ps[iPlayer].pyoff / zmaptoworld, sActor, sPlayer);
 		break;
 
 	case PLAYER_OPYOFF:
-		if (bSet) ps[iPlayer].opyoff = lValue;
-		else SetGameVarID(lVar2, ps[iPlayer].opyoff, sActor, sPlayer);
+		if (bSet) ps[iPlayer].opyoff = lValue * zmaptoworld;
+		else SetGameVarID(lVar2, ps[iPlayer].opyoff / zmaptoworld, sActor, sPlayer);
 		break;
 
 	case PLAYER_POSXV:
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index e1e2636f1..23b0aedbd 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -845,7 +845,7 @@ static void shootlaser(DDukeActor* actor, int p, int sx, int sy, int sz, int sa)
 		zvel = -ps[p].horizon.sum().asq16() >> 11;
 	else zvel = 0;
 
-	hitscan(vec3_t( sx, sy, sz - ps[p].pyoff ), sectp, { bcos(sa), bsin(sa), zvel << 6 }, hit, CLIPMASK1);
+	hitscan(vec3_t( sx, sy, sz - ps[p].pyoff * zworldtoint ), sectp, { bcos(sa), bsin(sa), zvel << 6 }, hit, CLIPMASK1);
 
 	j = 0;
 	if (hit.actor()) return;
@@ -1020,7 +1020,7 @@ void shoot_d(DDukeActor* actor, int atwith)
 	{
 		sx = ps[p].player_int_pos().X;
 		sy = ps[p].player_int_pos().Y;
-		sz = ps[p].player_int_pos().Z + ps[p].pyoff + (4 << 8);
+		sz = ps[p].player_int_pos().Z + ps[p].pyoff * zworldtoint + (4 << 8);
 		sa = ps[p].angle.ang.Buildang();
 
 		ps[p].crack_time = CRACK_TIME;
@@ -1680,7 +1680,7 @@ static void operateJetpack(int snum, ESyncBits actions, int psectlotag, int fz,
 
 	p->pycount += 32;
 	p->pycount &= 2047;
-	p->pyoff = bsin(p->pycount, -7);
+	p->pyoff = DAngle::fromBuild(p->pycount).Sin();
 
 	if (p->jetpack_on && S_CheckActorSoundPlaying(pact, DUKE_SCREAM))
 	{
@@ -1763,7 +1763,7 @@ static void movement(int snum, ESyncBits actions, sectortype* psect, int fz, int
 			i = 34;
 			p->pycount += 32;
 			p->pycount &= 2047;
-			p->pyoff = bsin(p->pycount, -6);
+			p->pyoff = DAngle::fromBuild(p->pycount).Sin() * 2;
 		}
 		else i = 12;
 
@@ -1939,7 +1939,7 @@ static void underwater(int snum, ESyncBits actions, int fz, int cz)
 
 	p->pycount += 32;
 	p->pycount &= 2047;
-	p->pyoff = bsin(p->pycount, -7);
+	p->pyoff = DAngle::fromBuild(p->pycount).Sin();
 
 	if (!S_CheckActorSoundPlaying(pact, DUKE_UNDERWATER))
 		S_PlayActorSound(DUKE_UNDERWATER, pact);
@@ -3050,7 +3050,10 @@ HORIZONLY:
 			{
 				p->pycount += 52;
 				p->pycount &= 2047;
-				p->pyoff = abs(pact->spr.xvel * bsin(p->pycount)) / 1596;
+				p->pyoff = DAngle::fromBuild(p->pycount).Sin() * pact->spr.xvel;
+
+				const double factor = 64. / 1596; // What is 1596?
+				p->pyoff = abs(pact->spr.xvel * DAngle::fromBuild(p->pycount).Sin()) * factor;
 			}
 		}
 		else if (psectlotag != 2 && psectlotag != 1)
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 54125f8b6..5ffaa2cc8 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -836,7 +836,7 @@ void shoot_r(DDukeActor* actor, int atwith)
 
 		sx = ps[p].player_int_pos().X;
 		sy = ps[p].player_int_pos().Y;
-		sz = ps[p].player_int_pos().Z + ps[p].pyoff + (4 << 8);
+		sz = ps[p].player_int_pos().Z + ps[p].pyoff * zworldtoint + (4 << 8);
 		sa = ps[p].angle.ang.Buildang();
 
 		if (isRRRA()) ps[p].crack_time = CRACK_TIME;
@@ -2079,7 +2079,7 @@ static void movement(int snum, ESyncBits actions, sectortype* psect, int fz, int
 			i = 34;
 			p->pycount += 32;
 			p->pycount &= 2047;
-			p->pyoff = bsin(p->pycount, -6);
+			p->pyoff = DAngle::fromBuild(p->pycount).Sin() * 2;
 		}
 		else i = 12;
 
@@ -2297,7 +2297,7 @@ static void underwater(int snum, ESyncBits actions, int fz, int cz)
 
 	p->pycount += 32;
 	p->pycount &= 2047;
-	p->pyoff = bsin(p->pycount, -7);
+	p->pyoff = DAngle::fromBuild(p->pycount).Sin();
 
 	if (!S_CheckActorSoundPlaying(pact, DUKE_UNDERWATER))
 		S_PlayActorSound(DUKE_UNDERWATER, pact);
@@ -3603,7 +3603,7 @@ void processinput_r(int snum)
 	{
 		p->pycount += 32;
 		p->pycount &= 2047;
-		p->pyoff = bsin(p->pycount, -(p->SeaSick ? 2 : 7));
+		p->pyoff = DAngle::fromBuild(p->pycount).Sin() * (p->SeaSick? 32 : 1);
 	}
 
 	if (psectlotag == ST_2_UNDERWATER)
@@ -3886,8 +3886,8 @@ HORIZONLY:
 			{
 				p->pycount += 52;
 				p->pycount &= 2047;
-				p->pyoff =
-					abs(pact->spr.xvel * bsin(p->pycount)) / 1596;
+				const double factor = 64. / 1596; // What is 1596?
+				p->pyoff = abs(pact->spr.xvel * DAngle::fromBuild(p->pycount).Sin()) * factor;
 			}
 		}
 		else if (psectlotag != ST_2_UNDERWATER && psectlotag != 1 && (!isRRRA() || !p->sea_sick_stat))
diff --git a/source/games/duke/src/render.cpp b/source/games/duke/src/render.cpp
index ccaf0ee88..56d299ef1 100644
--- a/source/games/duke/src/render.cpp
+++ b/source/games/duke/src/render.cpp
@@ -339,7 +339,7 @@ void displayrooms(int snum, double smoothratio, bool sceneonly)
 		}
 		else if (p->over_shoulder_on == 0)
 		{
-			if (cl_viewbob) cposz += interpolatedvalue(p->opyoff, p->pyoff, smoothratio);
+			if (cl_viewbob) cposz += interpolatedvaluef(p->opyoff, p->pyoff, smoothratio) * zworldtoint;
 			viewer = p->GetActor();
 		}
 		else
diff --git a/source/games/duke/src/spawn.cpp b/source/games/duke/src/spawn.cpp
index 133dd7042..4f37d1d7d 100644
--- a/source/games/duke/src/spawn.cpp
+++ b/source/games/duke/src/spawn.cpp
@@ -439,7 +439,7 @@ void initshell(DDukeActor* actj, DDukeActor* act, bool isshell)
 			ang = ps[snum].angle.ang - DAngle::fromBuild((krand() & 63) + 8);  //Fine tune
 
 			act->temp_data[0] = krand() & 1;
-			act->spr.pos.Z = 3 + ps[snum].pos.Z + ps[snum].pyoff * zinttoworld - (ps[snum].horizon.sum().asbuildf() * (1/16.)) + (!isshell ? 3 : 0);
+			act->spr.pos.Z = 3 + ps[snum].pos.Z + ps[snum].pyoff - (ps[snum].horizon.sum().asbuildf() * (1/16.)) + (!isshell ? 3 : 0);
 			act->spr.zvel = -(krand() & 255);
 		}
 		else
diff --git a/source/games/duke/src/types.h b/source/games/duke/src/types.h
index 6c69b67f9..8eaf42cfb 100644
--- a/source/games/duke/src/types.h
+++ b/source/games/duke/src/types.h
@@ -229,7 +229,6 @@ struct player_struct
 	// From here on it is unaltered from JFDuke with the exception of a few fields that are no longer needed and were removed.
 	int numloogs, oloogcnt, loogcnt;
 	int invdisptime;
-	int pyoff, opyoff;
 	int last_pissed_time;
 	int player_par, visibility;
 	int bobcounter;
@@ -237,6 +236,7 @@ struct player_struct
 
 	int aim_mode, ftt;
 
+	double pyoff, opyoff;
 	double truefz, truecz;
 	sectortype* cursector;
 	sectortype* one_parallax_sectnum; // wall + sector references.
diff --git a/wadsrc/static/zscript/games/duke/dukegame.zs b/wadsrc/static/zscript/games/duke/dukegame.zs
index c9b4512ca..e00799c86 100644
--- a/wadsrc/static/zscript/games/duke/dukegame.zs
+++ b/wadsrc/static/zscript/games/duke/dukegame.zs
@@ -159,7 +159,7 @@ struct DukePlayer
 	// From here on it is unaltered from JFDuke with the exception of a few fields that are no longer needed and were removed.
 	native int numloogs, loogcnt;
 	native int invdisptime;
-	native int pyoff, opyoff;
+	native double pyoff, opyoff;
 	native int last_pissed_time;
 	native double truefz, truecz;
 	native int player_par, visibility;