reimplement aether stuff from personal repo

Minecraft.World/QuicksoilShelfFeature.cpp

@@ -0,0 +1,66 @@
+#include "stdafx.h"
+#include "QuicksoilShelfFeature.h"
+#include "net.minecraft.world.level.h"
+#include "net.minecraft.world.level.tile.h"
+
+QuicksoilShelfFeature::QuicksoilShelfFeature() : Feature(false)
+{
+}
+
+bool QuicksoilShelfFeature::place(Level *level, Random *random, int x, int y, int z)
+{
+	// Find the bottom of the island at this XZ column
+	// Start from the given Y and scan downward to find the lowest solid block
+	int bottomY = -1;
+	for (int yy = y; yy >= 1; yy--)
+	{
+		int tile = level->getTile(x, yy, z);
+		if (tile != 0)
+		{
+			// Check if the block below is air — this is the island bottom
+			if (level->getTile(x, yy - 1, z) == 0)
+			{
+				bottomY = yy;
+				break;
+			}
+		}
+	}
+
+	if (bottomY < 1) return false;
+
+	// Generate a shelf of quicksoil on the underside of the island
+	// Place quicksoil in a roughly circular blob hanging from the bottom
+	int radius = 2 + random->nextInt(3);  // radius 2-4
+	int depth = 1 + random->nextInt(2);   // depth 1-2
+
+	for (int dx = -radius; dx <= radius; dx++)
+	{
+		for (int dz = -radius; dz <= radius; dz++)
+		{
+			// Circular shape with some randomness
+			float dist = sqrt((float)(dx * dx + dz * dz));
+			if (dist > radius + 0.5f) continue;
+
+			// More likely to place at center, less at edges
+			if (dist > radius - 1 && random->nextInt(3) != 0) continue;
+
+			int px = x + dx;
+			int pz = z + dz;
+
+			for (int dy = 0; dy < depth; dy++)
+			{
+				int py = bottomY - dy;
+				if (py < 1) continue;
+
+				int existing = level->getTile(px, py, pz);
+				// Only replace air blocks or existing holystone/aetherDirt at the underside
+				if (existing == 0 || existing == Tile::holystone_Id || existing == Tile::aetherDirt_Id)
+				{
+					level->setTileNoUpdate(px, py, pz, Tile::quicksoil_Id);
+				}
+			}
+		}
+	}
+
+	return true;
+}