diff --git a/src/p_local.h b/src/p_local.h
index 2fd7bcbe..472c0706 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -234,6 +234,8 @@ void P_SceneryThinker(mobj_t *mobj);
 
 fixed_t P_GetFloorZ(mobj_t *mobj, sector_t *sector, fixed_t x, fixed_t y, line_t *line);
 fixed_t P_GetCeilingZ(mobj_t *mobj, sector_t *sector, fixed_t x, fixed_t y, line_t *line);
+fixed_t P_GetFOFTopZ(mobj_t *mobj, sector_t *sector, ffloor_t *fof, fixed_t x, fixed_t y, line_t *line);
+fixed_t P_GetFOFBottomZ(mobj_t *mobj, sector_t *sector, ffloor_t *fof, fixed_t x, fixed_t y, line_t *line);
 
 boolean P_InsideANonSolidFFloor(mobj_t *mobj, ffloor_t *rover);
 boolean P_CheckDeathPitCollide(mobj_t *mo);
diff --git a/src/p_map.c b/src/p_map.c
index 4b74b0f0..6257ede1 100644
--- a/src/p_map.c
+++ b/src/p_map.c
@@ -1244,15 +1244,8 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 			if (!(rover->flags & FF_EXISTS))
 				continue;
 
-			fixed_t topheight = *rover->topheight;
-			fixed_t bottomheight = *rover->bottomheight;
-
-/*#ifdef ESLOPE
-			if (rover->t_slope)
-				topheight = P_GetZAt(rover->t_slope, thing->x, thing->y);
-			if (rover->b_slope)
-				bottomheight = P_GetZAt(rover->b_slope, thing->x, thing->y);
-#endif*/
+			fixed_t topheight = P_GetFOFTopZ(thing, newsubsec->sector, rover, x, y, NULL);
+			fixed_t bottomheight = P_GetFOFBottomZ(thing, newsubsec->sector, rover, x, y, NULL);
 
 			if (rover->flags & FF_GOOWATER && !(thing->flags & MF_NOGRAVITY))
 			{
@@ -1276,7 +1269,7 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 						if (tmfloorz < topheight - sinklevel) {
 							tmfloorz = topheight - sinklevel;
 #ifdef ESLOPE
-							tmfloorslope = NULL;
+							tmfloorslope = *rover->t_slope;
 #endif
 						}
 					}
@@ -1285,7 +1278,7 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 						if (tmceilingz > bottomheight + sinklevel) {
 							tmceilingz = bottomheight + sinklevel;
 #ifdef ESLOPE
-							tmceilingslope = NULL;
+							tmceilingslope = *rover->b_slope;
 #endif
 						}
 					}
@@ -1327,7 +1320,7 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 			{
 				tmfloorz = tmdropoffz = topheight;
 #ifdef ESLOPE
-				tmfloorslope = NULL;
+				tmfloorslope = *rover->t_slope;
 #endif
 			}
 			if (bottomheight < tmceilingz && abs(delta1) >= abs(delta2)
@@ -1336,7 +1329,7 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 			{
 				tmceilingz = tmdrpoffceilz = bottomheight;
 #ifdef ESLOPE
-				tmceilingslope = NULL;
+				tmceilingslope = *rover->b_slope;
 #endif
 			}
 		}
@@ -4010,12 +4003,12 @@ fixed_t P_FloorzAtPos(fixed_t x, fixed_t y, fixed_t z, fixed_t height)
 			fixed_t topheight = *rover->topheight;
 			fixed_t bottomheight = *rover->bottomheight;
 
-/*#ifdef ESLOPE
-			if (rover->t_slope)
-				topheight = P_GetZAt(rover->t_slope, x, y);
-			if (rover->b_slope)
-				bottomheight = P_GetZAt(rover->b_slope, x, y);
-#endif*/
+#ifdef ESLOPE
+			if (*rover->t_slope)
+				topheight = P_GetZAt(*rover->t_slope, x, y);
+			if (*rover->b_slope)
+				bottomheight = P_GetZAt(*rover->b_slope, x, y);
+#endif
 
 			if (rover->flags & FF_QUICKSAND)
 			{
diff --git a/src/p_maputl.c b/src/p_maputl.c
index b5ac2950..4037d769 100644
--- a/src/p_maputl.c
+++ b/src/p_maputl.c
@@ -659,6 +659,10 @@ void P_LineOpening(line_t *linedef)
 			fixed_t highestfloor = openbottom;
 			fixed_t lowestfloor = lowfloor;
 			fixed_t delta1, delta2;
+#ifdef ESLOPE
+			pslope_t *ceilingslope = opentopslope;
+			pslope_t *floorslope = openbottomslope;
+#endif
 
 			// Check for frontsector's fake floors
 			for (rover = front->ffloors; rover; rover = rover->next)
@@ -672,32 +676,32 @@ void P_LineOpening(line_t *linedef)
 					|| (rover->flags & FF_BLOCKOTHERS && !tmthing->player)))
 					continue;
 
-				fixed_t topheight = *rover->topheight;
-				fixed_t bottomheight = *rover->bottomheight;
-
-/*#ifdef ESLOPE
-				if (rover->t_slope)
-					topheight = P_GetZAt(rover->t_slope, camera.x, camera.y);
-
-				if (rover->b_slope)
-					bottomheight = P_GetZAt(rover->b_slope, camera.x, camera.y);
-#endif*/
+				fixed_t topheight = P_GetFOFTopZ(tmthing, front, rover, tmx, tmy, linedef);
+				fixed_t bottomheight = P_GetFOFBottomZ(tmthing, front, rover, tmx, tmy, linedef);
 
 				delta1 = abs(tmthing->z - (bottomheight + ((topheight - bottomheight)/2)));
 				delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (bottomheight < lowestceiling)
+					if (bottomheight < lowestceiling) {
 						lowestceiling = bottomheight;
+#ifdef ESLOPE
+						ceilingslope = *rover->b_slope;
+#endif
+					}
 					else if (bottomheight < highestceiling)
 						highestceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (topheight > highestfloor)
+					if (topheight > highestfloor) {
 						highestfloor = topheight;
+#ifdef ESLOPE
+						floorslope = *rover->t_slope;
+#endif
+					}
 					else if (topheight > lowestfloor)
 						lowestfloor = topheight;
 				}
@@ -715,32 +719,32 @@ void P_LineOpening(line_t *linedef)
 					|| (rover->flags & FF_BLOCKOTHERS && !tmthing->player)))
 					continue;
 
-				fixed_t topheight = *rover->topheight;
-				fixed_t bottomheight = *rover->bottomheight;
-
-/*#ifdef ESLOPE
-				if (rover->t_slope)
-					topheight = P_GetZAt(rover->t_slope, tmthing->x, tmthing->y);
-
-				if (rover->b_slope)
-					bottomheight = P_GetZAt(rover->b_slope, tmthing->x, tmthing->y);
-#endif*/
+				fixed_t topheight = P_GetFOFTopZ(tmthing, back, rover, tmx, tmy, linedef);
+				fixed_t bottomheight = P_GetFOFBottomZ(tmthing, back, rover, tmx, tmy, linedef);
 
 				delta1 = abs(tmthing->z - (bottomheight + ((topheight - bottomheight)/2)));
 				delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (bottomheight < lowestceiling)
+					if (bottomheight < lowestceiling) {
 						lowestceiling = bottomheight;
+#ifdef ESLOPE
+						ceilingslope = *rover->b_slope;
+#endif
+					}
 					else if (bottomheight < highestceiling)
 						highestceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (topheight > highestfloor)
+					if (topheight > highestfloor) {
 						highestfloor = topheight;
+#ifdef ESLOPE
+						floorslope = *rover->t_slope;
+#endif
+					}
 					else if (topheight > lowestfloor)
 						lowestfloor = topheight;
 				}
@@ -754,13 +758,21 @@ void P_LineOpening(line_t *linedef)
 
 				delta1 = abs(tmthing->z - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
 				delta2 = abs(thingtop - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
-				if (polysec->floorheight < lowestceiling && delta1 >= delta2)
+				if (polysec->floorheight < lowestceiling && delta1 >= delta2) {
 					lowestceiling = polysec->floorheight;
+#ifdef ESLOPE
+					ceilingslope = NULL;
+#endif
+				}
 				else if (polysec->floorheight < highestceiling && delta1 >= delta2)
 					highestceiling = polysec->floorheight;
 
-				if (polysec->ceilingheight > highestfloor && delta1 < delta2)
+				if (polysec->ceilingheight > highestfloor && delta1 < delta2) {
 					highestfloor = polysec->ceilingheight;
+#ifdef ESLOPE
+					floorslope = NULL;
+#endif
+				}
 				else if (polysec->ceilingheight > lowestfloor && delta1 < delta2)
 					lowestfloor = polysec->ceilingheight;
 			}
@@ -771,14 +783,14 @@ void P_LineOpening(line_t *linedef)
 			if (highestfloor > openbottom) {
 				openbottom = highestfloor;
 #ifdef ESLOPE
-				openbottomslope = NULL;
+				openbottomslope = floorslope;
 #endif
 			}
 
 			if (lowestceiling < opentop) {
 				opentop = lowestceiling;
 #ifdef ESLOPE
-				opentopslope = NULL;
+				opentopslope = ceilingslope;
 #endif
 			}
 
diff --git a/src/p_mobj.c b/src/p_mobj.c
index af832d58..421ec400 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -706,12 +706,12 @@ boolean P_InsideANonSolidFFloor(mobj_t *mobj, ffloor_t *rover)
 	fixed_t topheight = *rover->topheight;
 	fixed_t bottomheight = *rover->bottomheight;
 
-/*#ifdef ESLOPE
-	if (rover->t_slope)
-		topheight = P_GetZAt(rover->t_slope, mobj->x, mobj->y);
-	if (rover->b_slope)
-		bottomheight = P_GetZAt(rover->b_slope, mobj->x, mobj->y);
-#endif*/
+#ifdef ESLOPE
+	if (*rover->t_slope)
+		topheight = P_GetZAt(*rover->t_slope, mobj->x, mobj->y);
+	if (*rover->b_slope)
+		bottomheight = P_GetZAt(*rover->b_slope, mobj->x, mobj->y);
+#endif
 
 	if (mobj->z > topheight)
 		return false;
@@ -967,6 +967,251 @@ fixed_t P_GetCeilingZ(mobj_t *mobj, sector_t *sector, fixed_t x, fixed_t y, line
 		return sector->ceilingheight;
 }
 
+// Do the same as above, but for FOFs!
+fixed_t P_GetFOFTopZ(mobj_t *mobj, sector_t *sector, ffloor_t *fof, fixed_t x, fixed_t y, line_t *line) // SRB2CBTODO: This needs to be over all the code
+{
+	I_Assert(mobj != NULL);
+	I_Assert(sector != NULL);
+	I_Assert(fof != NULL);
+#ifdef ESLOPE
+	if (*fof->t_slope) {
+		fixed_t testx, testy;
+		pslope_t *slope = *fof->t_slope;
+
+		// Get the corner of the object that should be the highest on the slope
+		if (slope->d.x < 0)
+			testx = mobj->radius;
+		else
+			testx = -mobj->radius;
+
+		if (slope->d.y < 0)
+			testy = mobj->radius;
+		else
+			testy = -mobj->radius;
+
+		if (slope->zdelta > 0) {
+			testx = -testx;
+			testy = -testy;
+		}
+
+		testx += x;
+		testy += y;
+
+		// If the highest point is in the sector, then we have it easy! Just get the Z at that point
+		if (R_PointInSubsector(testx, testy)->sector == sector)
+			return P_GetZAt(slope, testx, testy);
+
+		// If we're just testing for base sector location (no collision line), just go for the center's spot...
+		// It'll get fixed when we test for collision anyway, and the final result can't be lower than this
+		if (line == NULL)
+			return P_GetZAt(slope, x, y);
+
+		// Alright, so we're sitting on a line that contains our slope sector, and need to figure out the highest point we're touching...
+		// The solution is simple! Get the line's vertices, and pull each one in along its line until it touches the object's bounding box
+		// (assuming it isn't already inside), then test each point's slope Z and return the higher of the two.
+		{
+			vertex_t v1, v2;
+			v1.x = line->v1->x;
+			v1.y = line->v1->y;
+			v2.x = line->v2->x;
+			v2.y = line->v2->y;
+
+			/*CONS_Printf("BEFORE: v1 = %f %f %f\n",
+						FIXED_TO_FLOAT(v1.x),
+						FIXED_TO_FLOAT(v1.y),
+						FIXED_TO_FLOAT(P_GetZAt(slope, v1.x, v1.y))
+						);
+			CONS_Printf("        v2 = %f %f %f\n",
+						FIXED_TO_FLOAT(v2.x),
+						FIXED_TO_FLOAT(v2.y),
+						FIXED_TO_FLOAT(P_GetZAt(slope, v2.x, v2.y))
+						);*/
+
+			if (abs(v1.x-x) > mobj->radius) {
+				// v1's x is out of range, so rein it in
+				fixed_t diff = abs(v1.x-x) - mobj->radius;
+
+				if (v1.x < x) { // Moving right
+					v1.x += diff;
+					v1.y += FixedMul(diff, FixedDiv(line->dy, line->dx));
+				} else { // Moving left
+					v1.x -= diff;
+					v1.y -= FixedMul(diff, FixedDiv(line->dy, line->dx));
+				}
+			}
+
+			if (abs(v1.y-y) > mobj->radius) {
+				// v1's y is out of range, so rein it in
+				fixed_t diff = abs(v1.y-y) - mobj->radius;
+
+				if (v1.y < y) { // Moving up
+					v1.y += diff;
+					v1.x += FixedMul(diff, FixedDiv(line->dx, line->dy));
+				} else { // Moving down
+					v1.y -= diff;
+					v1.x -= FixedMul(diff, FixedDiv(line->dx, line->dy));
+				}
+			}
+
+			if (abs(v2.x-x) > mobj->radius) {
+				// v1's x is out of range, so rein it in
+				fixed_t diff = abs(v2.x-x) - mobj->radius;
+
+				if (v2.x < x) { // Moving right
+					v2.x += diff;
+					v2.y += FixedMul(diff, FixedDiv(line->dy, line->dx));
+				} else { // Moving left
+					v2.x -= diff;
+					v2.y -= FixedMul(diff, FixedDiv(line->dy, line->dx));
+				}
+			}
+
+			if (abs(v2.y-y) > mobj->radius) {
+				// v2's y is out of range, so rein it in
+				fixed_t diff = abs(v2.y-y) - mobj->radius;
+
+				if (v2.y < y) { // Moving up
+					v2.y += diff;
+					v2.x += FixedMul(diff, FixedDiv(line->dx, line->dy));
+				} else { // Moving down
+					v2.y -= diff;
+					v2.x -= FixedMul(diff, FixedDiv(line->dx, line->dy));
+				}
+			}
+
+			/*CONS_Printf("AFTER:  v1 = %f %f %f\n",
+						FIXED_TO_FLOAT(v1.x),
+						FIXED_TO_FLOAT(v1.y),
+						FIXED_TO_FLOAT(P_GetZAt(slope, v1.x, v1.y))
+						);
+			CONS_Printf("        v2 = %f %f %f\n",
+						FIXED_TO_FLOAT(v2.x),
+						FIXED_TO_FLOAT(v2.y),
+						FIXED_TO_FLOAT(P_GetZAt(slope, v2.x, v2.y))
+						);*/
+
+			// Return the higher of the two points
+			return max(
+				P_GetZAt(slope, v1.x, v1.y),
+				P_GetZAt(slope, v2.x, v2.y)
+			);
+		}
+	} else // Well, that makes it easy. Just get the top height
+#endif
+		return *fof->topheight;
+}
+
+fixed_t P_GetFOFBottomZ(mobj_t *mobj, sector_t *sector, ffloor_t *fof, fixed_t x, fixed_t y, line_t *line) // SRB2CBTODO: This needs to be over all the code
+{
+	I_Assert(mobj != NULL);
+	I_Assert(sector != NULL);
+	I_Assert(fof != NULL);
+#ifdef ESLOPE
+	if (*fof->t_slope) {
+		fixed_t testx, testy;
+		pslope_t *slope = *fof->t_slope;
+
+		// Get the corner of the object that should be the lowest on the slope
+		if (slope->d.x < 0)
+			testx = mobj->radius;
+		else
+			testx = -mobj->radius;
+
+		if (slope->d.y < 0)
+			testy = mobj->radius;
+		else
+			testy = -mobj->radius;
+
+		if (slope->zdelta < 0) {
+			testx = -testx;
+			testy = -testy;
+		}
+
+		testx += x;
+		testy += y;
+
+		// If the lowest point is in the sector, then we have it easy! Just get the Z at that point
+		if (R_PointInSubsector(testx, testy)->sector == sector)
+			return P_GetZAt(slope, testx, testy);
+
+		// If we're just testing for base sector location (no collision line), just go for the center's spot...
+		// It'll get fixed when we test for collision anyway, and the final result can't be higher than this
+		if (line == NULL)
+			return P_GetZAt(slope, x, y);
+
+		// Alright, so we're sitting on a line that contains our slope sector, and need to figure out the highest point we're touching...
+		// The solution is simple! Get the line's vertices, and pull each one in along its line until it touches the object's bounding box
+		// (assuming it isn't already inside), then test each point's slope Z and return the lower of the two.
+		{
+			vertex_t v1, v2;
+			v1.x = line->v1->x;
+			v1.y = line->v1->y;
+			v2.x = line->v2->x;
+			v2.y = line->v2->y;
+
+			if (abs(v1.x-x) > mobj->radius) {
+				// v1's x is out of range, so rein it in
+				fixed_t diff = abs(v1.x-x) - mobj->radius;
+
+				if (v1.x < x) { // Moving right
+					v1.x += diff;
+					v1.y += FixedMul(diff, FixedDiv(line->dy, line->dx));
+				} else { // Moving left
+					v1.x -= diff;
+					v1.y -= FixedMul(diff, FixedDiv(line->dy, line->dx));
+				}
+			}
+
+			if (abs(v1.y-y) > mobj->radius) {
+				// v1's y is out of range, so rein it in
+				fixed_t diff = abs(v1.y-y) - mobj->radius;
+
+				if (v1.y < y) { // Moving up
+					v1.y += diff;
+					v1.x += FixedMul(diff, FixedDiv(line->dx, line->dy));
+				} else { // Moving down
+					v1.y -= diff;
+					v1.x -= FixedMul(diff, FixedDiv(line->dx, line->dy));
+				}
+			}
+
+			if (abs(v2.x-x) > mobj->radius) {
+				// v1's x is out of range, so rein it in
+				fixed_t diff = abs(v2.x-x) - mobj->radius;
+
+				if (v2.x < x) { // Moving right
+					v2.x += diff;
+					v2.y += FixedMul(diff, FixedDiv(line->dy, line->dx));
+				} else { // Moving left
+					v2.x -= diff;
+					v2.y -= FixedMul(diff, FixedDiv(line->dy, line->dx));
+				}
+			}
+
+			if (abs(v2.y-y) > mobj->radius) {
+				// v2's y is out of range, so rein it in
+				fixed_t diff = abs(v2.y-y) - mobj->radius;
+
+				if (v2.y < y) { // Moving up
+					v2.y += diff;
+					v2.x += FixedMul(diff, FixedDiv(line->dx, line->dy));
+				} else { // Moving down
+					v2.y -= diff;
+					v2.x -= FixedMul(diff, FixedDiv(line->dx, line->dy));
+				}
+			}
+
+			// Return the lower of the two points
+			return min(
+				P_GetZAt(slope, v1.x, v1.y),
+				P_GetZAt(slope, v2.x, v2.y)
+			);
+		}
+	} else // Well, that makes it easy. Just get the bottom height
+#endif
+		return *fof->bottomheight;
+}
+
 static void P_PlayerFlip(mobj_t *mo)
 {
 	if (!mo->player)
@@ -1710,6 +1955,7 @@ static void P_AdjustMobjFloorZ_FFloors(mobj_t *mo, sector_t *sector, UINT8 motyp
 {
 	ffloor_t *rover;
 	fixed_t delta1, delta2, thingtop;
+	fixed_t topheight, bottomheight;
 
 	I_Assert(mo != NULL);
 	I_Assert(!P_MobjWasRemoved(mo));
@@ -1721,6 +1967,9 @@ static void P_AdjustMobjFloorZ_FFloors(mobj_t *mo, sector_t *sector, UINT8 motyp
 		if (!(rover->flags & FF_EXISTS))
 			continue;
 
+		topheight = P_GetFOFTopZ(mo, sector, rover, mo->x, mo->y, NULL);
+		bottomheight = P_GetFOFBottomZ(mo, sector, rover, mo->x, mo->y, NULL);
+
 		if (mo->player && (P_CheckSolidLava(mo, rover) || P_CanRunOnWater(mo->player, rover))) // only the player should be affected
 			;
 		else if (motype != 0 && rover->flags & FF_SWIMMABLE) // "scenery" only
@@ -1735,14 +1984,14 @@ static void P_AdjustMobjFloorZ_FFloors(mobj_t *mo, sector_t *sector, UINT8 motyp
 			switch (motype)
 			{
 				case 2: // scenery does things differently for some reason
-					if (mo->z < *rover->topheight && *rover->bottomheight < thingtop)
+					if (mo->z < topheight && bottomheight < thingtop)
 					{
 						mo->floorz = mo->z;
 						continue;
 					}
 					break;
 				default:
-					if (mo->z < *rover->topheight && *rover->bottomheight < thingtop)
+					if (mo->z < topheight && bottomheight < thingtop)
 					{
 						if (mo->floorz < mo->z)
 							mo->floorz = mo->z;
@@ -1751,17 +2000,17 @@ static void P_AdjustMobjFloorZ_FFloors(mobj_t *mo, sector_t *sector, UINT8 motyp
 			}
 		}
 
-		delta1 = mo->z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2));
-		delta2 = thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2));
-		if (*rover->topheight > mo->floorz && abs(delta1) < abs(delta2)
+		delta1 = mo->z - (bottomheight + ((topheight - bottomheight)/2));
+		delta2 = thingtop - (bottomheight + ((topheight - bottomheight)/2));
+		if (topheight > mo->floorz && abs(delta1) < abs(delta2)
 			&& !(rover->flags & FF_REVERSEPLATFORM))
 		{
-			mo->floorz = *rover->topheight;
+			mo->floorz = topheight;
 		}
-		if (*rover->bottomheight < mo->ceilingz && abs(delta1) >= abs(delta2)
+		if (bottomheight < mo->ceilingz && abs(delta1) >= abs(delta2)
 			&& !(rover->flags & FF_PLATFORM))
 		{
-			mo->ceilingz = *rover->bottomheight;
+			mo->ceilingz = bottomheight;
 		}
 	}
 }
@@ -2804,13 +3053,13 @@ void P_MobjCheckWater(mobj_t *mobj)
 		fixed_t topheight = *rover->topheight;
 		fixed_t bottomheight = *rover->bottomheight;
 
-/*#ifdef ESLOPE
-		if (rover->t_slope)
-			topheight = P_GetZAt(rover->t_slope, mobj->x, mobj->y);
+#ifdef ESLOPE
+		if (*rover->t_slope)
+			topheight = P_GetZAt(*rover->t_slope, mobj->x, mobj->y);
 
-		if (rover->b_slope)
-			bottomheight = P_GetZAt(rover->b_slope, mobj->x, mobj->y);
-#endif*/
+		if (*rover->b_slope)
+			bottomheight = P_GetZAt(*rover->b_slope, mobj->x, mobj->y);
+#endif
 
 		if (mobj->eflags & MFE_VERTICALFLIP)
 		{