diff --git a/.gitmodules b/.gitmodules
index 915e660..85924b9 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "wrapper/data"]
 	path = wrapper/data
 	url = ssh://git@gitlab.bixilon.de:222/bixilon/pixlyzer-data.git
+[submodule "pixlyzer-physics"]
+	path = pixlyzer-physics
+	url = ssh://git@gitlab.bixilon.de:222/bixilon/pixlyzer-physics.git
diff --git a/pixlyzer-physics b/pixlyzer-physics
new file mode 160000
index 0000000..04c3129
--- /dev/null
+++ b/pixlyzer-physics
@@ -0,0 +1 @@
+Subproject commit 04c31297179487ac728e97df5e7108a316516838
diff --git a/pom.xml b/pom.xml
index ae6d686..104db46 100644
--- a/pom.xml
+++ b/pom.xml
@@ -99,6 +99,11 @@
             <artifactId>jackson-databind</artifactId>
             <version>2.13.3</version>
         </dependency>
+        <dependency>
+            <groupId>de.bixilon</groupId>
+            <artifactId>kutil</artifactId>
+            <version>1.17.1</version>
+        </dependency>
 
         <dependency>
             <groupId>com.github.oshi</groupId>
diff --git a/src/main/kotlin/de/bixilon/pixlyzer/EntitySpawner.kt b/src/main/kotlin/de/bixilon/pixlyzer/EntitySpawner.kt
index dfa2c18..ba8491b 100644
--- a/src/main/kotlin/de/bixilon/pixlyzer/EntitySpawner.kt
+++ b/src/main/kotlin/de/bixilon/pixlyzer/EntitySpawner.kt
@@ -91,6 +91,20 @@ object EntitySpawner {
 
     val CLIENT_LEVEL = OBJENSIS.newInstance(levelClass) as ClientWorld
 
+    fun World.setDimension() {
+        getClass("net.minecraft.world.dimension.OverworldDimension", "net.minecraft.world.dimension.DimensionType")?.let {
+            val dimension = OBJENSIS.newInstance(it)
+            getField(DimensionType::class.java, "minimumY")?.set(dimension, 0)
+            getField(World::class.java, "dimensionEntry")?.let {
+                setFinalField(getField(World::class.java, "dimensionEntry")!!, this, getClass("net.minecraft.util.registry.RegistryEntry\$Direct")!!.getConstructor(Any::class.java).newInstance(dimension))
+            }
+            try {
+                setFinalField(getField(World::class.java, "dimension")!!, this, dimension)
+            } catch (ignored: Throwable) {
+            }
+        }
+    }
+
 
     init {
         val randomField = getField(World::class.java, "random")!!
@@ -98,17 +112,8 @@ object EntitySpawner {
         setFinalField(getField(World::class.java, "border")!!, CLIENT_LEVEL, WorldBorder())
         setFinalField(getField(World::class.java, "properties")!!, CLIENT_LEVEL, OBJENSIS.newInstance(getClass("net.minecraft.world.level.LevelProperties")))
         setFinalField(getField(levelClass, "scoreboard")!!, CLIENT_LEVEL, Scoreboard())
-        getClass("net.minecraft.world.dimension.OverworldDimension", "net.minecraft.world.dimension.DimensionType")?.let {
-            val dimension = OBJENSIS.newInstance(it)
-            getField(DimensionType::class.java, "minimumY")?.set(dimension, 0)
-            getField(World::class.java, "dimensionEntry")?.let {
-                setFinalField(getField(World::class.java, "dimensionEntry")!!, CLIENT_LEVEL, getClass("net.minecraft.util.registry.RegistryEntry\$Direct")!!.getConstructor(Any::class.java).newInstance(dimension))
-            }
-            try {
-                setFinalField(getField(World::class.java, "dimension")!!, CLIENT_LEVEL, dimension)
-            } catch (ignored: Throwable) {
-            }
-        }
+        CLIENT_LEVEL.setDimension()
+
         val networkHandler = OBJENSIS.newInstance(ClientPlayNetworkHandler::class.java)
         networkHandler.recipeManager = RecipeManager()
         getField(ClientWorld::class.java, "networkHandler", "netHandler")!!.set(CLIENT_LEVEL, networkHandler)
diff --git a/src/main/kotlin/de/bixilon/pixlyzer/PixLyzer.kt b/src/main/kotlin/de/bixilon/pixlyzer/PixLyzer.kt
index 5253048..3fde1a2 100644
--- a/src/main/kotlin/de/bixilon/pixlyzer/PixLyzer.kt
+++ b/src/main/kotlin/de/bixilon/pixlyzer/PixLyzer.kt
@@ -1,5 +1,6 @@
 package de.bixilon.pixlyzer
 
+import de.bixilon.kutil.reflection.ReflectionUtil.forceInit
 import de.bixilon.mbf.MBFBinaryWriter
 import de.bixilon.mbf.MBFCompressionTypes
 import de.bixilon.mbf.MBFData
@@ -76,6 +77,14 @@ object PixLyzer {
         println("Class loading done in ${System.currentTimeMillis() - classesLoadStartTime}ms")
 
 
+        val physics = getClass("de.bixilon.pixlyzer.physics.PhysicsExtractor")
+        if (physics == null) {
+            println("Physics module not found, ignoring")
+        } else {
+            physics.forceInit()
+            physics.getDeclaredMethod("start").invoke(null)
+        }
+
         val all: MutableMap<String, Any> = mutableMapOf()
         for (generator in Generators.GENERATORS) {
             val startTime = System.currentTimeMillis()
diff --git a/wrapper/PixLyzer.py b/wrapper/PixLyzer.py
index 2560b77..8334a8b 100755
--- a/wrapper/PixLyzer.py
+++ b/wrapper/PixLyzer.py
@@ -42,6 +42,7 @@ LIBRARIES = [
     ("com.fasterxml.jackson.core", "jackson-annotations", JACKSON_VERSION),
     ("com.github.luben", "zstd-jni", "1.5.2-3"),
     ("de.bixilon", "mbf-kotlin", "0.2.1"),
+    ("de.bixilon", "kutil", "1.17.1"),
 ]
 
 VERSION_MANIFEST_URL = "https://launchermeta.mojang.com/mc/game/version_manifest.json"