Dynamic bridge collision (#1137)

* Initial commit

* Don't update bridge offset if not necessary

* Don't stick to bridge when in air

* Update Changes.txt

* Minor simplification

* Simplify

* Update collide_room.h

* Update collide_room.h

* Use real floor height to determine bridge collision

* Detect bridges first to avoid potential issues with item init

* Remove incorrect forward declaration

* Move pickups on dynamic bridges

* Push player away from moving bridges

* Update Changes.txt

* Use actual pickup bounds for collision detection

* Stabilize collision by using both abs Y and bb Y ref points

* Update collide_item.cpp

* Swap function parameters

* Update collide_room.cpp

* Increase movement tolerance

---------

Co-authored-by: Sezz <sezzary@outlook.com>
Co-authored-by: Jakub <80340234+Kubsy@users.noreply.github.com>

Documentation/Changes.txt

@@ -14,6 +14,8 @@ Version 1.1.0
 * Add multiple doppelgangers by using the same OCB for the origin nullmesh and doppelganger.
 * Pause all sounds when entering inventory or pause menu.
 * Improve deflection against slopes.
+* Move and rotate Lara together with dynamic bridge objects.
+* Move and rotate activated pickups together with dynamic bridge objects.
 * Add TR1 skateboard kid.
 * Add TR1 Kold.
 

TombEngine/Game/Lara/lara_collide.cpp

@@ -48,6 +48,10 @@ bool LaraDeflectEdge(ItemInfo* item, CollisionInfo* coll)
 		ShiftItem(item, coll);
 		item->Pose.Orientation.y -= ANGLE(coll->DiagonalStepAtRight() ? DEFLECT_DIAGONAL_ANGLE : DEFLECT_STRAIGHT_ANGLE);
 	}
+	else if (coll->LastBridgeItemNumber != NO_ITEM)
+	{
+		ShiftItem(item, coll);
+	}
 
 	return false;
 }
@@ -202,8 +206,8 @@ bool LaraDeflectEdgeCrawl(ItemInfo* item, CollisionInfo* coll)
 bool LaraDeflectEdgeMonkey(ItemInfo* item, CollisionInfo* coll)
 {
 	// HACK
-	if (coll->Shift.y >= 0 && coll->Shift.y <= CLICK(1.25f))
+	if (coll->Shift.Position.y >= 0 && coll->Shift.Position.y <= CLICK(1.25f))
-		coll->Shift.y = 0;
+		coll->Shift.Position.y = 0;
 
 	if (coll->CollisionType == CT_FRONT || coll->CollisionType == CT_TOP_FRONT ||
 		coll->HitTallObject)

TombEngine/Game/Lara/lara_monkey.cpp

@@ -140,8 +140,8 @@ void lara_col_monkey_idle(ItemInfo* item, CollisionInfo* coll)
 	GetCollisionInfo(coll, item);
 	
 	// HACK: Prevent ShiftItem() from causing an instantaneous snap, thereby interfering with DoLaraMonkeyStep(), when going down a step. @Sezz 2022.01.28
-	if (coll->Shift.y >= 0 && coll->Shift.y <= CLICK(1.25f))
+	if (coll->Shift.Position.y >= 0 && coll->Shift.Position.y <= CLICK(1.25f))
-		coll->Shift.y = 0;
+		coll->Shift.Position.y = 0;
 	ShiftItem(item, coll);
 
 	if (TestLaraMonkeyFall(item, coll))

TombEngine/Game/Lara/lara_tests.cpp

@@ -250,9 +250,9 @@ bool TestLaraHang(ItemInfo* item, CollisionInfo* coll)
 		else // Death, incorrect ledge or ACTION release
 		{
 			SetAnimation(item, LA_JUMP_UP, 9);
-			item->Pose.Position.x += coll->Shift.x;
+			item->Pose.Position.x += coll->Shift.Position.x;
 			item->Pose.Position.y += GameBoundingBox(item).Y2 * 1.8f;
-			item->Pose.Position.z += coll->Shift.z;
+			item->Pose.Position.z += coll->Shift.Position.z;
 			item->Animation.IsAirborne = true;
 			item->Animation.Velocity.z = 2;
 			item->Animation.Velocity.y = 1;
@@ -472,12 +472,12 @@ bool TestLaraHangOnClimbableWall(ItemInfo* item, CollisionInfo* coll)
 	{
 	case NORTH:
 	case SOUTH:
-		item->Pose.Position.z += coll2.Shift.z;
+		item->Pose.Position.z += coll2.Shift.Position.z;
 		break;
 
 	case EAST:
 	case WEST:
-		item->Pose.Position.x += coll2.Shift.x;
+		item->Pose.Position.x += coll2.Shift.Position.x;
 		break;
 
 	default:

TombEngine/Game/collision/collide_item.cpp

@@ -753,6 +753,54 @@ bool ItemPushItem(ItemInfo* item, ItemInfo* item2, CollisionInfo* coll, bool ena
 	return true;
 }
 
+// Simplified version of ItemPushItem for basic pushes.
+bool ItemPushItem(ItemInfo* item, ItemInfo* item2)
+{
+	float sinY = phd_sin(item->Pose.Orientation.y);
+	float cosY = phd_cos(item->Pose.Orientation.y);
+
+	// Get direction vector from item to player.
+	auto direction = item2->Pose.Position - item->Pose.Position;
+
+	// Rotate Lara vector into item frame.
+	int rx = (direction.x * cosY) - (direction.z * sinY);
+	int rz = (direction.z * cosY) + (direction.x * sinY);
+
+	const auto& bounds = GetBestFrame(*item).BoundingBox;
+
+	int minX = bounds.X1;
+	int maxX = bounds.X2;
+	int minZ = bounds.Z1;
+	int maxZ = bounds.Z2;
+
+	// Big enemies
+	if (abs(direction.x) > BLOCK(4.5f) || abs(direction.z) > BLOCK(4.5f) ||
+		rx <= minX || rx >= maxX ||
+		rz <= minZ || rz >= maxZ)
+	{
+		return false;
+	}
+
+	int left = rx - minX;
+	int top = maxZ - rz;
+	int bottom = rz - minZ;
+	int right = maxX - rx;
+
+	if (right <= left && right <= top && right <= bottom)
+		rx += right;
+	else if (left <= right && left <= top && left <= bottom)
+		rx -= left;
+	else if (top <= left && top <= right && top <= bottom)
+		rz += top;
+	else
+		rz -= bottom;
+
+	item2->Pose.Position.x = item->Pose.Position.x + (rx * cosY) + (rz * sinY);
+	item2->Pose.Position.z = item->Pose.Position.z + (rz * cosY) - (rx * sinY);
+
+	return true;
+}
+
 // NOTE: Previously ItemPushLaraStatic().
 bool ItemPushStatic(ItemInfo* item, const MESH_INFO& mesh, CollisionInfo* coll)
 {
@@ -828,6 +876,62 @@ bool ItemPushStatic(ItemInfo* item, const MESH_INFO& mesh, CollisionInfo* coll)
 	return true;
 }
 
+void ItemPushBridge(ItemInfo& item, CollisionInfo& coll)
+{
+	coll.Setup.ForwardAngle = item.Pose.Orientation.y;
+	coll.Setup.OldPosition = item.Pose.Position;
+	GetCollisionInfo(&coll, &item);
+	ShiftItem(&item, &coll);
+}
+
+void CollideBridgeItems(ItemInfo& item, CollisionInfo& coll, const CollisionResult& collResult)
+{
+	// Store an offset for a bridge item into shifts, if exists.
+	if (coll.LastBridgeItemNumber == collResult.Position.Bridge && coll.LastBridgeItemNumber != NO_ITEM)
+	{
+		auto& bridgeItem = g_Level.Items[collResult.Position.Bridge];
+
+		auto deltaPos = bridgeItem.Pose.Position - coll.LastBridgeItemPose.Position;
+		auto deltaOrient = bridgeItem.Pose.Orientation - coll.LastBridgeItemPose.Orientation;
+		auto deltaPose = Pose(deltaPos, deltaOrient);
+
+		int absDeltaHeight = item.Pose.Position.y - collResult.Position.Floor;
+		int relDeltaHeight = absDeltaHeight + GameBoundingBox(&item).Y2;
+
+		if (deltaPose != Pose::Zero && 
+			(abs(absDeltaHeight) <= CLICK(1 / 8.0f) || abs(relDeltaHeight) <= CLICK(1 / 8.0f)))
+		{
+			const auto& bridgePos = bridgeItem.Pose.Position;
+
+			// Calculate offset.
+			auto relOffset = (item.Pose.Position - bridgePos).ToVector3();
+			auto rotMatrix = deltaPose.Orientation.ToRotationMatrix();
+			auto offset = bridgePos.ToVector3() + Vector3::Transform(relOffset, rotMatrix);
+
+			deltaPose.Position -= item.Pose.Position - Vector3i(offset);
+		   
+			// Don't update shifts if difference is too big (possibly bridge was teleported or just entered bridge).
+			if (deltaPose.Position.ToVector3().Length() <= coll.Setup.Radius * 2)
+				coll.Shift = deltaPose;
+		}
+		else if (deltaPos.ToVector3().Length() <= coll.Setup.Radius && relDeltaHeight > 0 &&
+				(deltaPos != Vector3i::Zero || deltaOrient != EulerAngles::Zero))
+		{
+			// Push item away if not directly above bridge, and bridge position was changed.
+			ItemPushItem(&bridgeItem, &item);
+		}
+
+		coll.LastBridgeItemPose = bridgeItem.Pose;
+	}
+	else
+	{
+		coll.LastBridgeItemPose = Pose::Zero;
+		coll.LastBridgeItemNumber = NO_ITEM;
+	}
+
+	coll.LastBridgeItemNumber = collResult.Position.Bridge;
+}
+
 void CollideSolidStatics(ItemInfo* item, CollisionInfo* coll)
 {
 	coll->HitTallObject = false;
@@ -1057,20 +1161,20 @@ bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose&
 	case NORTH:
 		if (rawShift.x > coll->Setup.Radius || rawShift.x < -coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = ox - x;
+			coll->Shift.Position.x = ox - x;
 			coll->CollisionType = CT_FRONT;
 		}
 		else if (rawShift.x > 0 && rawShift.x <= coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = 0;
+			coll->Shift.Position.z = 0;
 			coll->CollisionType = CT_LEFT;
 		}
 		else if (rawShift.x < 0 && rawShift.x >= -coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = 0;
+			coll->Shift.Position.z = 0;
 			coll->CollisionType = CT_RIGHT;
 		}
 
@@ -1079,20 +1183,20 @@ bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose&
 	case SOUTH:
 		if (rawShift.x > coll->Setup.Radius || rawShift.x < -coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = ox - x;
+			coll->Shift.Position.x = ox - x;
 			coll->CollisionType = CT_FRONT;
 		}
 		else if (rawShift.x > 0 && rawShift.x <= coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = 0;
+			coll->Shift.Position.z = 0;
 			coll->CollisionType = CT_RIGHT;
 		}
 		else if (rawShift.x < 0 && rawShift.x >= -coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = 0;
+			coll->Shift.Position.z = 0;
 			coll->CollisionType = CT_LEFT;
 		}
 
@@ -1101,20 +1205,20 @@ bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose&
 	case EAST:
 		if (rawShift.z > coll->Setup.Radius || rawShift.z < -coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = oz - z;
+			coll->Shift.Position.z = oz - z;
 			coll->CollisionType = CT_FRONT;
 		}
 		else if (rawShift.z > 0 && rawShift.z <= coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = 0;
+			coll->Shift.Position.x = 0;
 			coll->CollisionType = CT_RIGHT;
 		}
 		else if (rawShift.z < 0 && rawShift.z >= -coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = 0;
+			coll->Shift.Position.x = 0;
 			coll->CollisionType = CT_LEFT;
 		}
 
@@ -1123,20 +1227,20 @@ bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose&
 	case WEST:
 		if (rawShift.z > coll->Setup.Radius || rawShift.z < -coll->Setup.Radius)
 		{
-			coll->Shift.x = rawShift.x;
+			coll->Shift.Position.x = rawShift.x;
-			coll->Shift.z = oz - z;
+			coll->Shift.Position.z = oz - z;
 			coll->CollisionType = CT_FRONT;
 		}
 		else if (rawShift.z > 0 && rawShift.z <= coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = 0;
+			coll->Shift.Position.x = 0;
 			coll->CollisionType = CT_LEFT;
 		}
 		else if (rawShift.z < 0 && rawShift.z >= -coll->Setup.Radius)
 		{
-			coll->Shift.z = rawShift.z;
+			coll->Shift.Position.z = rawShift.z;
-			coll->Shift.x = 0;
+			coll->Shift.Position.x = 0;
 			coll->CollisionType = CT_RIGHT;
 		}
 
@@ -1144,15 +1248,15 @@ bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose&
 	}
 
 	// Determine final shifts orientation/distance.
-	distance = Vector3(x + coll->Shift.x, y, z + coll->Shift.z) - pose.Position.ToVector3();
+	distance = Vector3(x + coll->Shift.Position.x, y, z + coll->Shift.Position.z) - pose.Position.ToVector3();
 	sinY = phd_sin(-pose.Orientation.y);
 	cosY = phd_cos(-pose.Orientation.y);
 
 	// Calculate final shifts orientation/distance.
-	coll->Shift.x = (round((distance.x * cosY) - (distance.z * sinY)) + pose.Position.x) - item->Pose.Position.x;
+	coll->Shift.Position.x = (round((distance.x * cosY) - (distance.z * sinY)) + pose.Position.x) - item->Pose.Position.x;
-	coll->Shift.z = (round((distance.x * sinY) + (distance.z * cosY)) + pose.Position.z) - item->Pose.Position.z;
+	coll->Shift.Position.z = (round((distance.x * sinY) + (distance.z * cosY)) + pose.Position.z) - item->Pose.Position.z;
 
-	if (coll->Shift.x == 0 && coll->Shift.z == 0)
+	if (coll->Shift.Position.x == 0 && coll->Shift.Position.z == 0)
 		coll->CollisionType = CT_NONE; // Paranoid.
 
 	// Set splat state flag if item is Lara and bounds are taller than Lara's headroom.
@@ -1838,7 +1942,7 @@ void ObjectCollision(const short itemNumber, ItemInfo* laraItem, CollisionInfo*
 		if (TestCollision(item, laraItem))
 		{
 			if (coll->Setup.EnableObjectPush)
-				ItemPushItem(item, laraItem, coll, false, true);
+				ItemPushItem(item, laraItem, coll, false, 1);
 		}
 	}
 }

TombEngine/Game/collision/collide_item.h

@@ -1,10 +1,9 @@
 #pragma once
 #include "Math/Math.h"
 
-using std::pair;
-
 class FloorInfo;
 struct CollisionInfo;
+struct CollisionResult;
 struct ItemInfo;
 struct MESH_INFO;
 
@@ -20,7 +19,7 @@ extern MESH_INFO* CollidedMeshes[MAX_COLLIDED_OBJECTS];
 struct ObjectCollisionBounds
 {
 	GameBoundingBox						BoundingBox		 = GameBoundingBox::Zero;
-	pair<EulerAngles, EulerAngles> OrientConstraint = {};
+	std::pair<EulerAngles, EulerAngles> OrientConstraint = {};
 };
 
 void GenericSphereBoxCollision(short itemNumber, ItemInfo* laraItem, CollisionInfo* coll);
@@ -40,10 +39,13 @@ bool Move3DPosTo3DPos(ItemInfo* item, Pose& fromPose, const Pose& toPose, int ve
 bool TestBoundsCollide(ItemInfo* item, ItemInfo* laraItem, int radius);
 bool TestBoundsCollideStatic(ItemInfo* item, const MESH_INFO& mesh, int radius);
 bool ItemPushItem(ItemInfo* item, ItemInfo* laraItem, CollisionInfo* coll, bool enableSpasm, char bigPush);
+bool ItemPushItem(ItemInfo* item, ItemInfo* item2);
 bool ItemPushStatic(ItemInfo* laraItem, const MESH_INFO& mesh, CollisionInfo* coll);
+void ItemPushBridge(ItemInfo& item, CollisionInfo& coll);
 
 bool CollideSolidBounds(ItemInfo* item, const GameBoundingBox& box, const Pose& pose, CollisionInfo* coll);
 void CollideSolidStatics(ItemInfo* item, CollisionInfo* coll);
+void CollideBridgeItems(ItemInfo& item, CollisionInfo& coll, const CollisionResult& collResult);
 
 void AIPickupCollision(short itemNumber, ItemInfo* laraItem, CollisionInfo* coll);
 void ObjectCollision(short itemNumber, ItemInfo* laraItem, CollisionInfo* coll);

TombEngine/Game/collision/collide_room.cpp

@@ -18,7 +18,8 @@ using namespace TEN::Renderer;
 
 void ShiftItem(ItemInfo* item, CollisionInfo* coll)
 {
-	item->Pose.Position += coll->Shift;
+	item->Pose.Position += coll->Shift.Position;
+	item->Pose.Orientation += coll->Shift.Orientation;
 	coll->Shift = Vector3i::Zero;
 }
 
@@ -227,7 +228,7 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 
 	// Reset collision parameters.
 	coll->CollisionType = CollisionType::CT_NONE;
-	coll->Shift = Vector3i::Zero;
+	coll->Shift = Pose::Zero;
 
 	// Offset base probe position by provided offset, if any.
 	auto entityPos = item->Pose.Position + offset;
@@ -348,6 +349,9 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 	coll->Middle.Floor = height;
 	coll->Middle.Ceiling = ceiling;
 
+	// Additionally calculate bridge shifts, if present.
+	CollideBridgeItems(*item, *coll, collResult);
+
 	// TEST 3: FRONTAL PROBE
 
 	probePos.x = entityPos.x + xFront;
@@ -698,21 +702,21 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 
 	if (coll->Middle.Floor == NO_HEIGHT)
 	{
-		coll->Shift = coll->Setup.OldPosition - entityPos;
+		coll->Shift.Position += coll->Setup.OldPosition - entityPos;
 		coll->CollisionType = CT_FRONT;
 		return;
 	}
 
 	if (coll->Middle.Floor - coll->Middle.Ceiling <= 0)
 	{
-		coll->Shift = coll->Setup.OldPosition - entityPos;
+		coll->Shift.Position += coll->Setup.OldPosition - entityPos;
 		coll->CollisionType = CT_CLAMP;
 		return;
 	}
 
 	if (coll->Middle.Ceiling >= 0)
 	{
-		coll->Shift.y = coll->Middle.Ceiling;
+		coll->Shift.Position.y += coll->Middle.Ceiling;
 		coll->CollisionType = CT_TOP;
 	}
 
@@ -724,8 +728,8 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 	{
 		if (coll->Front.HasDiagonalSplit())
 		{
-			coll->Shift.x = coll->Setup.OldPosition.x - entityPos.x;
+			coll->Shift.Position.x += coll->Setup.OldPosition.x - entityPos.x;
-			coll->Shift.z = coll->Setup.OldPosition.z - entityPos.z;
+			coll->Shift.Position.z += coll->Setup.OldPosition.z - entityPos.z;
 		}
 		else
 		{
@@ -733,14 +737,14 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 			{
 			case 0:
 			case 2:
-				coll->Shift.x = coll->Setup.OldPosition.x - entityPos.x;
+				coll->Shift.Position.x += coll->Setup.OldPosition.x - entityPos.x;
-				coll->Shift.z = FindGridShift(entityPos.z + zFront, entityPos.z);
+				coll->Shift.Position.z += FindGridShift(entityPos.z + zFront, entityPos.z);
 				break;
 
 			case 1:
 			case 3:
-				coll->Shift.x = FindGridShift(entityPos.x + xFront, entityPos.x);
+				coll->Shift.Position.x += FindGridShift(entityPos.x + xFront, entityPos.x);
-				coll->Shift.z = coll->Setup.OldPosition.z - entityPos.z;
+				coll->Shift.Position.z += coll->Setup.OldPosition.z - entityPos.z;
 				break;
 
 			}
@@ -752,7 +756,7 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 	if (coll->Front.Ceiling > coll->Setup.LowerCeilingBound ||
 		coll->Front.Ceiling < coll->Setup.UpperCeilingBound)
 	{
-		coll->Shift = coll->Setup.OldPosition - entityPos;
+		coll->Shift.Position += coll->Setup.OldPosition - entityPos;
 		coll->CollisionType = CT_TOP_FRONT;
 		return;
 	}
@@ -768,8 +772,8 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 			// HACK: Force slight push-out to the left side to avoid stucking
 			TranslateItem(item, coll->Setup.ForwardAngle + ANGLE(8.0f), item->Animation.Velocity.z);
 
-			coll->Shift.x = coll->Setup.OldPosition.x - entityPos.x;
+			coll->Shift.Position.x += coll->Setup.OldPosition.x - entityPos.x;
-			coll->Shift.z = coll->Setup.OldPosition.z - entityPos.z;
+			coll->Shift.Position.z += coll->Setup.OldPosition.z - entityPos.z;
 		}
 		else
 		{
@@ -777,12 +781,12 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 			{
 			case 0:
 			case 2:
-				coll->Shift.x = FindGridShift(entityPos.x + xLeft, entityPos.x + xFront);
+				coll->Shift.Position.x += FindGridShift(entityPos.x + xLeft, entityPos.x + xFront);
 				break;
 
 			case 1:
 			case 3:
-				coll->Shift.z = FindGridShift(entityPos.z + zLeft, entityPos.z + zFront);
+				coll->Shift.Position.z += FindGridShift(entityPos.z + zLeft, entityPos.z + zFront);
 				break;
 			}
 		}
@@ -822,8 +826,8 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 			// HACK: Force slight push out to the right side to avoid getting stuck.
 			TranslateItem(item, coll->Setup.ForwardAngle - ANGLE(8.0f), item->Animation.Velocity.z);
 
-			coll->Shift.x = coll->Setup.OldPosition.x - entityPos.x;
+			coll->Shift.Position.x += coll->Setup.OldPosition.x - entityPos.x;
-			coll->Shift.z = coll->Setup.OldPosition.z - entityPos.z;
+			coll->Shift.Position.z += coll->Setup.OldPosition.z - entityPos.z;
 		}
 		else
 		{
@@ -831,12 +835,12 @@ void GetCollisionInfo(CollisionInfo* coll, ItemInfo* item, const Vector3i& offse
 			{
 			case 0:
 			case 2:
-				coll->Shift.x = FindGridShift(entityPos.x + xRight, entityPos.x + xFront);
+				coll->Shift.Position.x += FindGridShift(entityPos.x + xRight, entityPos.x + xFront);
 				break;
 
 			case 1:
 			case 3:
-				coll->Shift.z = FindGridShift(entityPos.z + zRight, entityPos.z + zFront);
+				coll->Shift.Position.z += FindGridShift(entityPos.z + zRight, entityPos.z + zFront);
 				break;
 			}
 		}

TombEngine/Game/collision/collide_room.h

@@ -1,9 +1,9 @@
 #pragma once
+
 #include "Math/Math.h"
 #include "Objects/game_object_ids.h"
 
 struct ItemInfo;
-struct CollisionInfo;
 class FloorInfo;
 struct ROOM_INFO;
 struct MESH_INFO;
@@ -105,13 +105,16 @@ struct CollisionInfo
 	CollisionPosition FrontLeft;    
 	CollisionPosition FrontRight;   
 
-	Vector3i Shift;
+	Pose Shift = Pose::Zero;
 	CollisionType CollisionType;
 	Vector2 FloorTilt;	 // x = x, y = z
 	Vector2 CeilingTilt; // x = x, y = z
 	short NearestLedgeAngle;
 	float NearestLedgeDistance;
 
+	int  LastBridgeItemNumber;
+	Pose LastBridgeItemPose;
+
 	bool HitStatic;
 	bool HitTallObject;
 

TombEngine/Game/itemdata/itemdata.h

@@ -4,6 +4,7 @@
 #include <stdexcept>
 #include <variant>
 
+#include "Game/collision/collide_room.h"
 #include "Game/itemdata/creature_info.h"
 #include "Game/itemdata/door_data.h"
 #include "Game/Lara/lara_struct.h"
@@ -56,6 +57,7 @@ class ItemData
 		PushableInfo,
 		ItemInfo*,
 		LaraInfo*,
+		CollisionInfo,
 		CreatureInfo,
 		WraithInfo,
 		GuardianInfo,

TombEngine/Game/pickup/pickup.cpp

@@ -959,6 +959,8 @@ void PickupControl(short itemNumber)
 {
 	auto* item = &g_Level.Items[itemNumber];
 	
+	ItemPushBridge(*item, *(CollisionInfo*)item->Data);
+
 	short roomNumber;
 	short triggerFlags = item->TriggerFlags & 0x3F;
 
@@ -1056,9 +1058,13 @@ const GameBoundingBox* FindPlinth(ItemInfo* item)
 void InitializePickup(short itemNumber)
 {
 	auto* item = &g_Level.Items[itemNumber];
-
 	auto bounds = GameBoundingBox(item);
 
+	item->Data = CollisionInfo();
+	auto* coll = (CollisionInfo*)item->Data;
+	coll->Setup.Radius = std::max(bounds.GetWidth(), bounds.GetDepth());
+	coll->Setup.Height = bounds.GetHeight();
+
 	short triggerFlags = item->TriggerFlags & 0x3F;
 	if (triggerFlags == 5)
 	{

TombEngine/Objects/Generic/Doors/generic_doors.cpp

@@ -253,7 +253,7 @@ namespace TEN::Entities::Doors
 					if (!(doorItem->ObjectNumber >= ID_LIFT_DOORS1 &&
 						doorItem->ObjectNumber <= ID_LIFT_DOORS2) || doorItem->ItemFlags[0])
 					{
-						ItemPushItem(doorItem, laraItem, coll, FALSE, TRUE);
+						ItemPushItem(doorItem, laraItem, coll, false, 1);
 					}
 				}
 			}

TombEngine/Objects/TR1/Trap/DamoclesSword.cpp

@@ -112,7 +112,7 @@ namespace TEN::Entities::Traps::TR1
 			return;
 
 		if (coll->Setup.EnableObjectPush)
-			ItemPushItem(&item, laraItem, coll, false, true);
+			ItemPushItem(&item, laraItem, coll, false, 1);
 
 		if (item.Animation.IsAirborne)
 		{

TombEngine/Objects/TR3/Vehicles/upv.cpp

@@ -184,7 +184,7 @@ namespace TEN::Entities::Vehicles
 		{
 			// HACK: Collision in water behaves differently? @Sezz 2022.06.28
 			if (TestBoundsCollide(UPVItem, laraItem, coll->Setup.Radius) && TestCollision(UPVItem, laraItem))
-				ItemPushItem(UPVItem, laraItem, coll, false, false);
+				ItemPushItem(UPVItem, laraItem, coll, false, 0);
 		}
 		else
 		{

TombEngine/Objects/TR4/Object/tr4_element_puzzle.cpp

@@ -152,7 +152,7 @@ namespace TEN::Entities::TR4
 			if (TestCollision(item, laraItem))
 			{
 				if (coll->Setup.EnableObjectPush)
-					ItemPushItem(item, laraItem, coll, 0, 0);
+					ItemPushItem(item, laraItem, coll, false, 0);
 			}
 		}
 	}

TombEngine/Objects/TR4/Object/tr4_scales.cpp

@@ -106,17 +106,17 @@ void ScalesCollision(short itemNumber, ItemInfo* laraItem, CollisionInfo* coll)
 			GlobalCollisionBounds.Z1 = -256;
 			GlobalCollisionBounds.Z2 = 384;
 
-			ItemPushItem(item, laraItem, coll, 0, 2);
+			ItemPushItem(item, laraItem, coll, false, 2);
 
 			GlobalCollisionBounds.X1 = -256;
 			GlobalCollisionBounds.X2 = 256;
 
-			ItemPushItem(item, laraItem, coll, 0, 2);
+			ItemPushItem(item, laraItem, coll, false, 2);
 
 			GlobalCollisionBounds.X1 = -1280;
 			GlobalCollisionBounds.X2 = -640;
 
-			ItemPushItem(item, laraItem, coll, 0, 2);
+			ItemPushItem(item, laraItem, coll, false, 2);
 		}
 		else
 		{

TombEngine/Objects/TR4/Trap/tr4_blade.cpp

@@ -29,7 +29,7 @@ namespace TEN::Entities::TR4
 				int dy = 0;
 				int dz = 0;
 
-				if (ItemPushItem(bladeItem, laraItem, coll, 1, 1))
+				if (ItemPushItem(bladeItem, laraItem, coll, true, 1))
 				{
 					DoDamage(laraItem, bladeItem->ItemFlags[3]);
 

TombEngine/Objects/TR4/Trap/tr4_cog.cpp

@@ -57,7 +57,7 @@ namespace TEN::Entities::TR4
                     DoDamage(laraItem, 10);
                 }
                 else if (coll->Setup.EnableObjectPush)
-                    ItemPushItem(cogItem, laraItem, coll, 0, 0);
+                    ItemPushItem(cogItem, laraItem, coll, false, 0);
             }
         }
     }

TombEngine/Objects/TR4/Trap/tr4_stargate.cpp

@@ -57,7 +57,7 @@ namespace TEN::Entities::Traps
 			GlobalCollisionBounds.Z1 = bounds.z;
 
 			if (TestWithGlobalCollisionBounds(item, laraItem, coll))
-				ItemPushItem(item, laraItem, coll, 0, 2);
+				ItemPushItem(item, laraItem, coll, false, 2);
 		}*/
 
 		if (!TestBoundsCollide(item, laraItem, coll->Setup.Radius))

TombEngine/Scripting/Internal/TEN/Objects/Moveable/MoveableObject.cpp

@@ -1,6 +1,7 @@
 #include "framework.h"
 
 #include "Game/items.h"
+#include "Game/collision/floordata.h"
 #include "Game/control/lot.h"
 #include "Game/effects/debris.h"
 #include "Game/effects/item_fx.h"
@@ -21,6 +22,7 @@
 #include "Scripting/Internal/TEN/Rotation/Rotation.h"
 #include "Scripting/Internal/TEN/Vec3/Vec3.h"
 
+using namespace TEN::Collision::Floordata;
 using namespace TEN::Effects::Items;
 
 /***
@@ -576,6 +578,10 @@ void Moveable::SetPos(Vec3 const& pos, sol::optional<bool> updateRoom)
 				SetRoomNumber(potentialNewRoom);
 		}
 	}
+
+	const auto& object = Objects[m_item->ObjectNumber];
+	if (object.floor != nullptr || object.ceiling != nullptr)
+		UpdateBridgeItem((int)m_item->Index);
 }
 
 Vec3 Moveable::GetJointPos(int jointIndex) const
@@ -598,11 +604,15 @@ Rotation Moveable::GetRot() const
 	};
 }
 
-void Moveable::SetRot(Rotation const& rot)
+void Moveable::SetRot(const Rotation& rot)
 {
 	m_item->Pose.Orientation.x = ANGLE(rot.x);
 	m_item->Pose.Orientation.y = ANGLE(rot.y);
 	m_item->Pose.Orientation.z = ANGLE(rot.z);
+
+	const auto& object = Objects[m_item->ObjectNumber];
+	if (object.floor != nullptr || object.ceiling != nullptr)
+		UpdateBridgeItem(m_item->Index);
 }
 
 /// Get current HP (hit points/health points)

TombEngine/Specific/level.cpp

@@ -187,9 +187,18 @@ void LoadItems()
 			memcpy(&item->StartPose, &item->Pose, sizeof(Pose));
 		}
 
+		// Initialize all bridges first.
+		// It is needed because some other items need final floor height to init properly.
+
+		for (int isFloor = 0; isFloor <= 1; isFloor++)
+		{
 			for (int i = 0; i < g_Level.NumItems; i++)
+			{
+				if ((Objects[g_Level.Items[i].ObjectNumber].floor == nullptr) == (bool)isFloor)
 					InitializeItem(i);
 			}
+		}
+	}
 }
 
 void LoadObjects()