diff --git a/source/games/blood/src/ai.cpp b/source/games/blood/src/ai.cpp
index a037a46f8..997d89b80 100644
--- a/source/games/blood/src/ai.cpp
+++ b/source/games/blood/src/ai.cpp
@@ -1505,6 +1505,7 @@ void aiThinkTarget(DBloodActor* actor)
 			PLAYER* pPlayer = &gPlayer[p];
 			if (actor->GetOwner() == pPlayer->actor || pPlayer->actor->xspr.health == 0 || powerupCheck(pPlayer, kPwUpShadowCloak) > 0)
 				continue;
+			auto ppos = pPlayer->actor->spr.pos;
 			int x = pPlayer->actor->int_pos().X;
 			int y = pPlayer->actor->int_pos().Y;
 			int z = pPlayer->actor->int_pos().Z;
@@ -1514,7 +1515,8 @@ void aiThinkTarget(DBloodActor* actor)
 			int nDist = approxDist(dx, dy);
 			if (nDist > pDudeInfo->seeDist && nDist > pDudeInfo->hearDist)
 				continue;
-			if (!cansee(x, y, z, pSector, actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - ((pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2), actor->sector()))
+			double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+			if (!cansee(ppos, pSector, actor->spr.pos.plusZ(-height), actor->sector()))
 				continue;
 
 			int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
@@ -1551,6 +1553,7 @@ void aiLookForTarget(DBloodActor* actor)
 			PLAYER* pPlayer = &gPlayer[p];
 			if (actor->GetOwner() == pPlayer->actor || pPlayer->actor->xspr.health == 0 || powerupCheck(pPlayer, kPwUpShadowCloak) > 0)
 				continue;
+			auto ppos = pPlayer->actor->spr.pos;
 			int x = pPlayer->actor->int_pos().X;
 			int y = pPlayer->actor->int_pos().Y;
 			int z = pPlayer->actor->int_pos().Z;
@@ -1560,7 +1563,8 @@ void aiLookForTarget(DBloodActor* actor)
 			int nDist = approxDist(dx, dy);
 			if (nDist > pDudeInfo->seeDist && nDist > pDudeInfo->hearDist)
 				continue;
-			if (!cansee(x, y, z, pSector, actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - ((pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2), actor->sector()))
+			double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+			if (!cansee(ppos, pSector, actor->spr.pos.plusZ(-height), actor->sector()))
 				continue;
 			int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
diff --git a/source/games/blood/src/aibat.cpp b/source/games/blood/src/aibat.cpp
index 5611436b9..41b29a8df 100644
--- a/source/games/blood/src/aibat.cpp
+++ b/source/games/blood/src/aibat.cpp
@@ -97,6 +97,7 @@ static void batThinkTarget(DBloodActor* actor)
 			PLAYER* pPlayer = &gPlayer[p];
 			if (pPlayer->actor->xspr.health == 0 || powerupCheck(pPlayer, kPwUpShadowCloak) > 0)
 				continue;
+			auto ppos = pPlayer->actor->spr.pos;
 			int x = pPlayer->actor->int_pos().X;
 			int y = pPlayer->actor->int_pos().Y;
 			int z = pPlayer->actor->int_pos().Z;
@@ -106,7 +107,8 @@ static void batThinkTarget(DBloodActor* actor)
 			int nDist = approxDist(dx, dy);
 			if (nDist > pDudeInfo->seeDist && nDist > pDudeInfo->hearDist)
 				continue;
-			if (!cansee(x, y, z, pSector, actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - ((pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2), actor->sector()))
+			double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+			if (!cansee(ppos, pSector, actor->spr.pos.plusZ(-height), actor->sector()))
 				continue;
 			int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
@@ -173,7 +175,7 @@ static void batThinkPonder(DBloodActor* actor)
 		int height2 = (getDudeInfo(pTarget->spr.type)->eyeHeight * pTarget->spr.yrepeat) << 2;
 		int top, bottom;
 		GetActorExtents(actor, &top, &bottom);
-		if (cansee(pTarget->int_pos().X, pTarget->int_pos().Y, pTarget->int_pos().Z, pTarget->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		if (cansee(pTarget->spr.pos, pTarget->sector(), actor->spr.pos.plusZ(-height * zinttoworld), actor->sector()))
 		{
 			aiSetTarget(actor, actor->GetTarget());
 			if (height2 - height < 0x3000 && nDist < 0x1800 && nDist > 0xc00 && abs(nDeltaAngle) < 85)
@@ -280,7 +282,7 @@ static void batThinkChase(DBloodActor* actor)
 		int height2 = (pDudeInfo->eyeHeight * pTarget->spr.yrepeat) << 2;
 		int top, bottom;
 		GetActorExtents(actor, &top, &bottom);
-		if (cansee(pTarget->int_pos().X, pTarget->int_pos().Y, pTarget->int_pos().Z, pTarget->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		if (cansee(pTarget->spr.pos, pTarget->sector(), actor->spr.pos.plusZ(-height * zinttoworld), actor->sector()))
 		{
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
diff --git a/source/games/blood/src/aibeast.cpp b/source/games/blood/src/aibeast.cpp
index 8d422d7c5..b1de27c84 100644
--- a/source/games/blood/src/aibeast.cpp
+++ b/source/games/blood/src/aibeast.cpp
@@ -234,8 +234,8 @@ static void beastThinkChase(DBloodActor* actor)
 	if (nDist <= pDudeInfo->seeDist)
 	{
 		int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
-		int height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2;
-		if (cansee(target->int_pos().X, target->int_pos().Y, target->int_pos().Z, target->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height), actor->sector()))
 		{
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
@@ -364,10 +364,10 @@ static void beastThinkSwimChase(DBloodActor* actor)
 	if (nDist <= pDudeInfo->seeDist)
 	{
 		int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
-		int height = pDudeInfo->eyeHeight + actor->int_pos().Z;
+		double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
 		int top, bottom;
 		GetActorExtents(actor, &top, &bottom);
-		if (cansee(target->int_pos().X, target->int_pos().Y, target->int_pos().Z, target->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height), actor->sector()))
 		{
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
diff --git a/source/games/blood/src/aiboneel.cpp b/source/games/blood/src/aiboneel.cpp
index ffacc4879..41d1b347d 100644
--- a/source/games/blood/src/aiboneel.cpp
+++ b/source/games/blood/src/aiboneel.cpp
@@ -109,6 +109,7 @@ static void eelThinkTarget(DBloodActor* actor)
 			PLAYER* pPlayer = &gPlayer[p];
 			if (pPlayer->actor->xspr.health == 0 || powerupCheck(pPlayer, kPwUpShadowCloak) > 0)
 				continue;
+			auto ppos = pPlayer->actor->spr.pos;
 			int x = pPlayer->actor->int_pos().X;
 			int y = pPlayer->actor->int_pos().Y;
 			int z = pPlayer->actor->int_pos().Z;
@@ -118,7 +119,8 @@ static void eelThinkTarget(DBloodActor* actor)
 			int nDist = approxDist(dx, dy);
 			if (nDist > pDudeInfo->seeDist && nDist > pDudeInfo->hearDist)
 				continue;
-			if (!cansee(x, y, z, pSector, actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - ((pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2), actor->sector()))
+			double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+			if (!cansee(ppos, pSector, actor->spr.pos.plusZ(-height), actor->sector()))
 				continue;
 			int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
@@ -187,7 +189,7 @@ static void eelThinkPonder(DBloodActor* actor)
 		int height2 = (getDudeInfo(target->spr.type)->eyeHeight * target->spr.yrepeat) << 2;
 		int top, bottom;
 		GetActorExtents(actor, &top, &bottom);
-		if (cansee(target->int_pos().X, target->int_pos().Y, target->int_pos().Z, target->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height * zinttoworld), actor->sector()))
 		{
 			aiSetTarget(actor, actor->GetTarget());
 			if (height2 - height < -0x2000 && nDist < 0x1800 && nDist > 0xc00 && abs(nDeltaAngle) < 85)
@@ -289,12 +291,12 @@ static void eelThinkChase(DBloodActor* actor)
 	if (nDist <= pDudeInfo->seeDist)
 	{
 		int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
-		int height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2;
+		double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
 		int top, bottom;
 		GetActorExtents(actor, &top, &bottom);
 		int top2, bottom2;
 		GetActorExtents(target, &top2, &bottom2);
-		if (cansee(target->int_pos().X, target->int_pos().Y, target->int_pos().Z, target->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height), actor->sector()))
 		{
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{
diff --git a/source/games/blood/src/aiburn.cpp b/source/games/blood/src/aiburn.cpp
index 352d4f60e..1c788e22c 100644
--- a/source/games/blood/src/aiburn.cpp
+++ b/source/games/blood/src/aiburn.cpp
@@ -194,8 +194,8 @@ static void burnThinkChase(DBloodActor* actor)
 	if (nDist <= pDudeInfo->seeDist)
 	{
 		int nDeltaAngle = ((getangle(dx, dy) + 1024 - actor->int_ang()) & 2047) - 1024;
-		int height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) << 2;
-		if (cansee(target->int_pos().X, target->int_pos().Y, target->int_pos().Z, target->sector(), actor->int_pos().X, actor->int_pos().Y, actor->int_pos().Z - height, actor->sector()))
+		double height = (pDudeInfo->eyeHeight * actor->spr.yrepeat) * REPEAT_SCALE;
+		if (cansee(target->spr.pos, target->sector(), actor->spr.pos.plusZ(-height), actor->sector()))
 		{
 			if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
 			{