From 9125d3f06d6e5549971964db0b4ff81e724ae7b8 Mon Sep 17 00:00:00 2001
From: disintegrate <oleajascha@gmail.com>
Date: Wed, 18 Mar 2026 10:45:02 +0800
Subject: [PATCH] Climbable trapdoors if connected to a ladder.

### Previous Behavior
Trapdoors still has collision even if opened, making it difficult to climb with.

### New Behavior
- Added a new condition in `LivingEntity::onLadder()` in case it's a trapdoor, then return as true (as if its a ladder).
- If there's a ladder under the (opened) trapdoor, then its collision box returns as a nullptr.

**Files:**
- `LivingEntity.cpp`
- `TrapDoorTile.cpp`
**Methods:**
- `LivingEntity::onLadder()`
- `TrapDoorTile::getAABB(Level *level, int x, int y, int z)`
---
 Minecraft.World/LivingEntity.cpp | 25 +++++++++++++++++++++++--
 Minecraft.World/TrapDoorTile.cpp | 12 ++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/Minecraft.World/LivingEntity.cpp b/Minecraft.World/LivingEntity.cpp
index 3af9efe96..192823f1f 100644
--- a/Minecraft.World/LivingEntity.cpp
+++ b/Minecraft.World/LivingEntity.cpp
@@ -986,9 +986,30 @@ bool LivingEntity::onLadder()
 	int yt = Mth::floor(bb->y0);
 	int zt = Mth::floor(z);
 
-	// 4J-PB - TU9 - add climbable vines
 	int iTile = level->getTile(xt, yt, zt);
-	return  (iTile== Tile::ladder_Id) || (iTile== Tile::vine_Id);
+	switch (iTile)
+	{
+	case Tile::ladder_Id:
+	case Tile::vine_Id: // 4J-PB - TU9 - add climbable vines
+		return true;
+	case Tile::trapdoor_Id: // hexagonny - add climbable (opened) trapdoors
+	{
+		int data = level->getData(xt, yt, zt);
+		bool isOpen = (data & 0x4) != 0;
+		if (isOpen)
+		{
+			int belowTile = level->getTile(xt, yt - 1, zt);
+			if (belowTile == Tile::ladder_Id)
+			{
+				return true;
+			}
+		}
+		break;
+	}
+	default:
+		break;
+	}
+	return false;
 }
 
 bool LivingEntity::isShootable()
diff --git a/Minecraft.World/TrapDoorTile.cpp b/Minecraft.World/TrapDoorTile.cpp
index 6ea64172e..af00275fe 100644
--- a/Minecraft.World/TrapDoorTile.cpp
+++ b/Minecraft.World/TrapDoorTile.cpp
@@ -50,6 +50,18 @@ AABB *TrapDoorTile::getTileAABB(Level *level, int x, int y, int z)
 
 AABB *TrapDoorTile::getAABB(Level *level, int x, int y, int z)
 {
+	int data = level->getData(x, y, z);
+	bool isOpen = (data & 0x4) != 0;
+
+	if (isOpen)
+	{
+		int belowTile = level->getTile(x, y - 1, z);
+		if (belowTile == Tile::ladder_Id)
+		{
+			return nullptr; // No collision when open above ladder
+		}
+	}
+	// Default behaviour
 	updateShape(level, x, y, z);
 	return Tile::getAABB(level, x, y, z);
 }