diff --git a/src/d_player.h b/src/d_player.h
index 19a998f74..b75a6f51f 100644
--- a/src/d_player.h
+++ b/src/d_player.h
@@ -499,6 +499,8 @@ typedef struct player_s
 	fixed_t bob;
 
 	angle_t viewrollangle;
+	// camera tilt
+	// TODO: expose to lua
 	angle_t tilt;
 
 	angle_t angleturn;
@@ -527,6 +529,8 @@ typedef struct player_s
 	tic_t airtime; 		// Keep track of how long you've been in the air
 	boolean driftInput; // Whenever or not try drifting.
 	boolean airFailsafe; // Whenever or not try the air boost
+	INT32 aizDriftTilt;
+	INT32 aizDriftTurn;
 
 	UINT8 trickpanel; 	// Trick panel state
 	boolean trickdelay;	// Prevent tricks until control stick is neutral
diff --git a/src/doomstat.h b/src/doomstat.h
index 522108913..159f83172 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -301,7 +301,6 @@ extern struct quake
 {
 	// camera offsets and duration
 	fixed_t x,y,z;
-	angle_t roll;
 	UINT16 time;
 
 	// location, radius, and intensity...
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index b797a19c4..2c2f21406 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -64,6 +64,7 @@ static void HWR_ProjectSprite(mobj_t *thing);
 #ifdef HWPRECIP
 static void HWR_ProjectPrecipitationSprite(precipmobj_t *thing);
 #endif
+static void HWR_RollTransform(FTransform *tr, angle_t roll);
 
 void HWR_AddTransparentFloor(levelflat_t *levelflat, extrasubsector_t *xsub, boolean isceiling, fixed_t fixedheight, INT32 lightlevel, INT32 alpha, sector_t *FOFSector, FBITFIELD blend, boolean fogplane, extracolormap_t *planecolormap);
 void HWR_AddTransparentPolyobjectFloor(levelflat_t *levelflat, polyobj_t *polysector, boolean isceiling, fixed_t fixedheight,
@@ -5205,7 +5206,8 @@ static void HWR_ProjectSprite(mobj_t *thing)
 	if (spriterotangle != 0
 	&& !(splat && !(thing->renderflags & RF_NOSPLATROLLANGLE)))
 	{
-		rollangle = R_GetRollAngle(spriterotangle);
+		rollangle = R_GetRollAngle(vflip
+				? InvAngle(spriterotangle) : spriterotangle);
 		rotsprite = Patch_GetRotatedSprite(sprframe, (thing->frame & FF_FRAMEMASK), rot, flip, false, sprinfo, rollangle);
 
 		if (rotsprite != NULL)
@@ -5743,14 +5745,8 @@ static void HWR_DrawSkyBackground(player_t *player)
 		dometransform.scalez = 1;
 		dometransform.fovxangle = fpov; // Tails
 		dometransform.fovyangle = fpov; // Tails
-		if (player->viewrollangle != 0)
-		{
-			fixed_t rol = AngleFixed(player->viewrollangle);
-			dometransform.rollangle = FIXED_TO_FLOAT(rol);
-			dometransform.roll = true;
-			dometransform.rollx = 1.0f;
-			dometransform.rollz = 0.0f;
-		}
+		HWR_RollTransform(&dometransform,
+				R_ViewRollAngle(player));
 		dometransform.splitscreen = r_splitscreen;
 
 		HWR_GetTexture(texturetranslation[skytexture]);
@@ -6042,14 +6038,7 @@ void HWR_RenderSkyboxView(player_t *player)
 
 	atransform.fovxangle = fpov; // Tails
 	atransform.fovyangle = fpov; // Tails
-	if (player->viewrollangle != 0)
-	{
-		fixed_t rol = AngleFixed(player->viewrollangle);
-		atransform.rollangle = FIXED_TO_FLOAT(rol);
-		atransform.roll = true;
-		atransform.rollx = 1.0f;
-		atransform.rollz = 0.0f;
-	}
+	HWR_RollTransform(&atransform, R_ViewRollAngle(player));
 	atransform.splitscreen = r_splitscreen;
 
 	gl_fovlud = (float)(1.0l/tan((double)(fpov*M_PIl/360l)));
@@ -6160,6 +6149,18 @@ void HWR_RenderSkyboxView(player_t *player)
 // ==========================================================================
 //
 // ==========================================================================
+
+static void HWR_RollTransform(FTransform *tr, angle_t roll)
+{
+	if (roll != 0)
+	{
+		tr->rollangle = roll / (float)ANG1;
+		tr->roll = true;
+		tr->rollx = 1.0f;
+		tr->rollz = 0.0f;
+	}
+}
+
 void HWR_RenderPlayerView(void)
 {
 	player_t * player = &players[displayplayers[viewssnum]];
@@ -6249,14 +6250,7 @@ void HWR_RenderPlayerView(void)
 
 	atransform.fovxangle = fpov; // Tails
 	atransform.fovyangle = fpov; // Tails
-	if (player->viewrollangle != 0)
-	{
-		fixed_t rol = AngleFixed(player->viewrollangle);
-		atransform.rollangle = FIXED_TO_FLOAT(rol);
-		atransform.roll = true;
-		atransform.rollx = 1.0f;
-		atransform.rollz = 0.0f;
-	}
+	HWR_RollTransform(&atransform, R_ViewRollAngle(player));
 	atransform.splitscreen = r_splitscreen;
 
 	gl_fovlud = (float)(1.0l/tan((double)(fpov*M_PIl/360l)));
diff --git a/src/k_kart.c b/src/k_kart.c
index fb899360a..ec7166c77 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -1920,6 +1920,15 @@ void K_KartMoveAnimation(player_t *player)
 		turndir = 1;
 	}
 
+	// Use drift frames when sliptiding
+	if (player->aizDriftTurn)
+	{
+		drift = (player->kartstuff[k_aizdriftstrat]);
+
+		if (drift)
+			turndir = 0;
+	}
+
 	if (lookback == true && drift == 0)
 	{
 		// Prioritize looking back frames over turning
@@ -7351,8 +7360,35 @@ static void K_KartDrift(player_t *player, boolean onground)
 			player->kartstuff[k_aizdriftstrat] = ((player->kartstuff[k_drift] > 0) ? 1 : -1);
 	}
 	else if (player->kartstuff[k_aizdriftstrat] && !player->kartstuff[k_drift])
+	{
 		K_SpawnAIZDust(player);
 
+		if (abs(player->aizDriftTilt) < ANGLE_22h)
+		{
+			player->aizDriftTilt =
+				(abs(player->aizDriftTilt) + ANGLE_11hh / 4) *
+				player->kartstuff[k_aizdriftstrat];
+		}
+
+		if (abs(player->aizDriftTurn) < ANGLE_112h)
+		{
+			player->aizDriftTurn =
+				(abs(player->aizDriftTurn) + ANGLE_11hh) *
+				player->kartstuff[k_aizdriftstrat];
+		}
+	}
+
+	if (!K_Sliptiding(player))
+	{
+		player->aizDriftTilt -= player->aizDriftTilt / 4;
+		player->aizDriftTurn -= player->aizDriftTurn / 4;
+
+		if (abs(player->aizDriftTilt) < ANGLE_11hh / 4)
+			player->aizDriftTilt = 0;
+		if (abs(player->aizDriftTurn) < ANGLE_11hh)
+			player->aizDriftTurn = 0;
+	}
+
 	if (player->kartstuff[k_drift]
 		&& ((buttons & BT_BRAKE)
 		|| !(buttons & BT_ACCELERATE))
@@ -7539,6 +7575,12 @@ boolean K_PlayerEBrake(player_t *player)
 	&& player->powers[pw_nocontrol] == 0;
 }
 
+SINT8 K_Sliptiding(player_t *player)
+{
+	const INT32 *p = player->kartstuff;
+	return p[k_drift] ? 0 : p[k_aizdriftstrat];
+}
+
 static void K_KartSpindashDust(mobj_t *parent)
 {
 	fixed_t rad = FixedDiv(FixedHypot(parent->radius, parent->radius), parent->scale);
diff --git a/src/k_kart.h b/src/k_kart.h
index da40df761..8a862ba71 100644
--- a/src/k_kart.h
+++ b/src/k_kart.h
@@ -96,6 +96,7 @@ UINT16 K_GetKartButtons(player_t *player);
 SINT8 K_GetForwardMove(player_t *player);
 fixed_t K_3dKartMovement(player_t *player);
 boolean K_PlayerEBrake(player_t *player);
+SINT8 K_Sliptiding(player_t *player);
 void K_AdjustPlayerFriction(player_t *player);
 void K_MoveKartPlayer(player_t *player, boolean onground);
 void K_CheckSpectateStatus(void);
diff --git a/src/p_local.h b/src/p_local.h
index a04f1f197..7c71c7ebf 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -523,6 +523,7 @@ void P_Thrust(mobj_t *mo, angle_t angle, fixed_t move);
 void P_ExplodeMissile(mobj_t *mo);
 void P_CheckGravity(mobj_t *mo, boolean affect);
 void P_SetPitchRollFromSlope(mobj_t *mo, pslope_t *slope);
+void P_SetPitchRoll(mobj_t *mo, angle_t pitch, angle_t yaw);
 fixed_t P_ScaleFromMap(fixed_t n, fixed_t scale);
 fixed_t P_GetMobjHead(const mobj_t *);
 fixed_t P_GetMobjFeet(const mobj_t *);
diff --git a/src/p_mobj.c b/src/p_mobj.c
index fff2a78f1..49165162d 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -1250,6 +1250,17 @@ void P_SetPitchRollFromSlope(mobj_t *mo, pslope_t *slope)
 	}
 }
 
+//
+// P_SetPitchRoll
+//
+void P_SetPitchRoll(mobj_t *mo, angle_t pitch, angle_t yaw)
+{
+	pitch = InvAngle(pitch);
+	yaw >>= ANGLETOFINESHIFT;
+	mo->roll  = FixedMul(pitch, FINESINE   (yaw));
+	mo->pitch = FixedMul(pitch, FINECOSINE (yaw));
+}
+
 #define STOPSPEED (FRACUNIT)
 
 //
@@ -1662,6 +1673,10 @@ void P_XYMovement(mobj_t *mo)
 					{
 						mo->momz = transfermomz;
 						mo->standingslope = NULL;
+						P_SetPitchRoll(mo, ANGLE_90,
+								transferslope->xydirection
+								+ (transferslope->zangle
+									& ANGLE_180));
 						if (player)
 						{
 							player->powers[pw_justlaunched] = 2;
diff --git a/src/p_tick.c b/src/p_tick.c
index ca02b1513..b79a1fa29 100644
--- a/src/p_tick.c
+++ b/src/p_tick.c
@@ -657,17 +657,10 @@ void P_Ticker(boolean run)
 			quake.z = M_RandomRange(-ir,ir);
 			if (cv_windowquake.value)
 				I_CursedWindowMovement(FixedInt(quake.x), FixedInt(quake.y));
-			ir >>= 2;
-			ir = M_RandomRange(-ir,ir);
-			if (ir < 0)
-				ir = ANGLE_MAX - FixedAngle(-ir);
-			else
-				ir = FixedAngle(ir);
-			quake.roll = ir;
 			--quake.time;
 		}
 		else
-			quake.x = quake.y = quake.z = quake.roll = 0;
+			quake.x = quake.y = quake.z = 0;
 
 		if (metalplayback)
 			G_ReadMetalTic(metalplayback);
diff --git a/src/p_user.c b/src/p_user.c
index 09b8865fd..938d0956f 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -2223,7 +2223,11 @@ void P_MovePlayer(player_t *player)
 		{
 			player->drawangle = player->mo->angle;
 
-			if (player->kartstuff[k_drift] != 0)
+			if (player->aizDriftTurn)
+			{
+				player->drawangle += player->aizDriftTurn;
+			}
+			else if (player->kartstuff[k_drift] != 0)
 			{
 				INT32 a = (ANGLE_45 / 5) * player->kartstuff[k_drift];
 				player->drawangle += a;
@@ -4251,11 +4255,7 @@ Quaketilt (player_t *player)
 	INT32 delta = (INT32)( player->mo->angle - moma );
 	fixed_t speed;
 
-	boolean sliptiding =
-		(
-				player->kartstuff[k_aizdriftstrat] != 0 &&
-				player->kartstuff[k_drift]         == 0
-		);
+	boolean sliptiding = K_Sliptiding(player);
 
 	if (delta == (INT32)ANGLE_180)/* FUCK YOU HAVE A HACK */
 	{
@@ -4299,52 +4299,37 @@ DoABarrelRoll (player_t *player)
 	angle_t slope;
 	angle_t delta;
 
+	fixed_t smoothing;
+
 	if (player->exiting)
 	{
 		return;
 	}
 
-	if (player->mo->standingslope)
-	{
-		slope = player->mo->standingslope->zangle;
-	}
-	else
+	slope = InvAngle(R_GetPitchRollAngle(player->mo));
+
+	if (AbsAngle(slope) < ANGLE_11hh)
 	{
 		slope = 0;
 	}
 
-	if (abs((INT32)slope) > ANGLE_11hh)
+	if (AbsAngle(slope) > ANGLE_45)
 	{
-		delta = ( player->mo->angle - player->mo->standingslope->xydirection );
-		slope = -(FixedMul(FINESINE (delta>>ANGLETOFINESHIFT), slope));
-	}
-	else
-	{
-		slope = 0;
+		slope = slope & ANGLE_180 ? InvAngle(ANGLE_45) : ANGLE_45;
 	}
 
 	slope -= Quaketilt(player);
 
-	delta = (INT32)( slope - player->tilt )/ 32;
+	delta = slope - player->tilt;
+	smoothing = FixedDiv(AbsAngle(slope), ANGLE_45);
+
+	delta = FixedDiv(delta, 33 *
+			FixedDiv(FRACUNIT, FRACUNIT + smoothing));
 
 	if (delta)
 		player->tilt += delta;
 	else
 		player->tilt  = slope;
-
-	if (cv_tilting.value)
-	{
-		player->viewrollangle = player->tilt;
-
-		if (cv_actionmovie.value)
-		{
-			player->viewrollangle += quake.roll;
-		}
-	}
-	else
-	{
-		player->viewrollangle = 0;
-	}
 }
 
 //
diff --git a/src/r_main.c b/src/r_main.c
index d895c4e10..d8b93144d 100644
--- a/src/r_main.c
+++ b/src/r_main.c
@@ -629,7 +629,7 @@ void R_CheckViewMorph(int s)
 	float fisheyemap[MAXVIDWIDTH/2 + 1];
 #endif
 
-	angle_t rollangle = players[displayplayers[s]].viewrollangle;
+	angle_t rollangle = R_ViewRollAngle(&players[displayplayers[s]]);
 #ifdef WOUGHMP_WOUGHMP
 	fixed_t fisheye = cv_cam2_turnmultiplier.value; // temporary test value
 #endif
@@ -936,6 +936,30 @@ void R_ApplyViewMorph(int s)
 			width*vid.bpp, height, width*vid.bpp, vid.width);
 }
 
+static inline int intsign(int n) {
+	return n < 0 ? -1 : n > 0 ? 1 : 0;
+}
+
+angle_t R_ViewRollAngle(const player_t *player)
+{
+	angle_t roll = player->viewrollangle;
+
+	if (cv_tilting.value)
+	{
+		roll += player->tilt;
+
+		if (cv_actionmovie.value)
+		{
+			int xs = intsign(quake.x),
+				 ys = intsign(quake.y),
+				 zs = intsign(quake.z);
+			roll += (xs ^ ys ^ zs) * ANG1;
+		}
+	}
+
+	return roll;
+}
+
 
 //
 // R_SetViewSize
diff --git a/src/r_main.h b/src/r_main.h
index d58773a73..49e028149 100644
--- a/src/r_main.h
+++ b/src/r_main.h
@@ -115,6 +115,7 @@ void R_Init(void);
 
 void R_CheckViewMorph(int split);
 void R_ApplyViewMorph(int split);
+angle_t R_ViewRollAngle(const player_t *player);
 
 // just sets setsizeneeded true
 extern boolean setsizeneeded;
diff --git a/src/r_patch.h b/src/r_patch.h
index c04a3b275..c6d222617 100644
--- a/src/r_patch.h
+++ b/src/r_patch.h
@@ -39,6 +39,7 @@ patch_t *Patch_GetRotatedSprite(
 	boolean flip, boolean adjustfeet,
 	void *info, INT32 rotationangle);
 INT32 R_GetRollAngle(angle_t rollangle);
+angle_t R_GetPitchRollAngle(mobj_t *mobj);
 angle_t R_SpriteRotationAngle(mobj_t *mobj);
 #endif
 
diff --git a/src/r_patchrotation.c b/src/r_patchrotation.c
index 769e4c92b..6149bab24 100644
--- a/src/r_patchrotation.c
+++ b/src/r_patchrotation.c
@@ -14,12 +14,13 @@
 #include "z_zone.h"
 #include "w_wad.h"
 #include "r_main.h" // R_PointToAngle
+#include "k_kart.h" // K_Sliptiding
 
 #ifdef ROTSPRITE
 fixed_t rollcosang[ROTANGLES];
 fixed_t rollsinang[ROTANGLES];
 
-angle_t R_SpriteRotationAngle(mobj_t *mobj)
+angle_t R_GetPitchRollAngle(mobj_t *mobj)
 {
 	angle_t viewingAngle = R_PointToAngle(mobj->x, mobj->y);
 
@@ -28,7 +29,30 @@ angle_t R_SpriteRotationAngle(mobj_t *mobj)
 
 	angle_t rollOrPitch = FixedMul(mobj->pitch, pitchMul) + FixedMul(mobj->roll, rollMul);
 
-	return (rollOrPitch + mobj->rollangle);
+	return rollOrPitch;
+}
+
+angle_t R_SpriteRotationAngle(mobj_t *mobj)
+{
+	angle_t viewingAngle = R_PointToAngle(mobj->x, mobj->y);
+	angle_t angleDelta = (viewingAngle - mobj->angle);
+
+	angle_t sliptideLift = mobj->player
+		? mobj->player->aizDriftTilt : 0;
+
+	angle_t rollOrPitch = R_GetPitchRollAngle(mobj);
+	angle_t rollAngle = (rollOrPitch + mobj->rollangle);
+
+	if (sliptideLift)
+	{
+		/* (from side) tilt downward if turning
+		   toward camera, upward if away. */
+		rollAngle +=
+			FixedMul(sliptideLift, FINESINE(AbsAngle(angleDelta) >> ANGLETOFINESHIFT)) +
+			FixedMul(sliptideLift, FINECOSINE(angleDelta >> ANGLETOFINESHIFT));
+	}
+
+	return rollAngle;
 }
 
 INT32 R_GetRollAngle(angle_t rollangle)
diff --git a/src/r_things.c b/src/r_things.c
index 4713fd61b..bb848a679 100644
--- a/src/r_things.c
+++ b/src/r_things.c
@@ -1581,7 +1581,8 @@ static void R_ProjectSprite(mobj_t *thing)
 	if (spriterotangle
 	&& !(splat && !(thing->renderflags & RF_NOSPLATROLLANGLE)))
 	{
-		rollangle = R_GetRollAngle(spriterotangle);
+		rollangle = R_GetRollAngle(vflip
+				? InvAngle(spriterotangle) : spriterotangle);
 		rotsprite = Patch_GetRotatedSprite(sprframe, (thing->frame & FF_FRAMEMASK), rot, flip, false, sprinfo, rollangle);
 
 		if (rotsprite != NULL)
diff --git a/src/tables.h b/src/tables.h
index a34b95ad2..e9ce14484 100644
--- a/src/tables.h
+++ b/src/tables.h
@@ -93,6 +93,12 @@ FUNCMATH FUNCINLINE static ATTRINLINE angle_t InvAngle(angle_t a)
 {
 	return (ANGLE_MAX-a)+1;
 }
+
+// 315 = 45
+FUNCMATH FUNCINLINE static ATTRINLINE angle_t AbsAngle(angle_t a)
+{
+	return a & ANGLE_180 ? InvAngle(a) : a;
+}
 // angle_t to fixed_t f(ANGLE_45) = 45*FRACUNIT
 FUNCMATH fixed_t AngleFixed(angle_t af);
 // fixed_t to angle_t f(45*FRACUNIT) = ANGLE_45