diff --git a/src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCullingTest.kt b/src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCullingTest.kt
index 705950b41..9acbf01c6 100644
--- a/src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCullingTest.kt
+++ b/src/integration-test/kotlin/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCullingTest.kt
@@ -15,9 +15,14 @@ package de.bixilon.minosoft.gui.rendering.models.block.state.baked.cull
 
 import de.bixilon.kotlinglm.vec2.Vec2
 import de.bixilon.kotlinglm.vec2.Vec2i
+import de.bixilon.kutil.exception.Broken
+import de.bixilon.minosoft.data.direction.Directions
+import de.bixilon.minosoft.data.registries.blocks.settings.BlockSettings
 import de.bixilon.minosoft.data.registries.blocks.state.BlockState
+import de.bixilon.minosoft.data.registries.blocks.types.Block
 import de.bixilon.minosoft.data.registries.identified.Namespaces.minosoft
 import de.bixilon.minosoft.gui.rendering.models.block.state.baked.BakedFace
+import de.bixilon.minosoft.gui.rendering.models.block.state.baked.BakedModel
 import de.bixilon.minosoft.gui.rendering.models.block.state.baked.SideSize
 import de.bixilon.minosoft.gui.rendering.system.base.texture.TextureTransparencies
 import de.bixilon.minosoft.gui.rendering.system.base.texture.texture.MemoryTexture
@@ -33,26 +38,34 @@ class FaceCullingTest {
     }
 
     private fun createNeighbour(size: SideSize? = SideSize(arrayOf(SideSize.FaceSize(Vec2(0), Vec2(1)))), transparency: TextureTransparencies = TextureTransparencies.OPAQUE): BlockState {
-        TODO()
+        val block = object : Block(minosoft("dummy"), BlockSettings()) {
+            override val hardness: Float get() = Broken()
+        }
+
+        val state = BlockState(block, 0)
+
+        state.model = BakedModel(emptyArray(), arrayOf(size, size, size, size, size, size), null)
+
+        return state
     }
 
     fun noNeighbour() {
         val face = createFace()
-        assertFalse(FaceCulling.canCull(face, null))
+        assertFalse(FaceCulling.canCull(face, Directions.DOWN, null))
     }
 
     @Test
     fun selfNotTouching() {
         val face = createFace(null)
         val neighbour = createNeighbour()
-        assertFalse(FaceCulling.canCull(face, neighbour))
+        assertFalse(FaceCulling.canCull(face, Directions.DOWN, neighbour))
     }
 
     @Test
     fun neighbourNotTouching() {
         val face = createFace()
         val neighbour = createNeighbour(null)
-        assertFalse(FaceCulling.canCull(face, neighbour))
+        assertFalse(FaceCulling.canCull(face, Directions.DOWN, neighbour))
     }
 
     // TODO: force no cull (e.g. leaves), mix of transparency, mix of side sizes
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/BakedModel.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/BakedModel.kt
index 77cab20a8..cfae52efd 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/BakedModel.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/BakedModel.kt
@@ -14,6 +14,7 @@
 package de.bixilon.minosoft.gui.rendering.models.block.state.baked
 
 import de.bixilon.kotlinglm.vec3.Vec3i
+import de.bixilon.minosoft.data.direction.Directions
 import de.bixilon.minosoft.data.registries.blocks.state.BlockState
 import de.bixilon.minosoft.data.world.positions.BlockPosition
 import de.bixilon.minosoft.gui.rendering.models.block.state.baked.cull.FaceCulling
@@ -24,21 +25,24 @@ import java.util.*
 
 class BakedModel(
     val faces: Array<Array<BakedFace>>,
-    val sizes: Array<SideSize>,
+    val sizes: Array<SideSize?>,
     val particle: AbstractTexture?,
 ) : BlockRender {
 
+    override fun getSize(direction: Directions) = sizes[direction.ordinal]
+
     override fun getParticleTexture(random: Random?, position: Vec3i) = particle
 
     override fun render(position: BlockPosition, offset: FloatArray, mesh: WorldMesh, random: Random?, state: BlockState, neighbours: Array<BlockState?>, light: ByteArray, tints: IntArray?): Boolean {
 
         var rendered = false
 
-        for ((direction, faces) in faces.withIndex()) {
-            val neighbour = neighbours[direction]
+        for ((directionIndex, faces) in faces.withIndex()) {
+            val neighbour = neighbours[directionIndex]
+            val direction = Directions.VALUES[directionIndex].inverted
 
             for (face in faces) {
-                if (FaceCulling.canCull(face, neighbour)) {
+                if (FaceCulling.canCull(face, direction, neighbour)) {
                     continue
                 }
                 face.render(offset, mesh, light, tints)
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/SideSize.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/SideSize.kt
index 72e2e2d5c..514e0e233 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/SideSize.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/SideSize.kt
@@ -19,6 +19,10 @@ class SideSize(
     val sizes: Array<FaceSize>,
 ) {
 
+    init {
+        if (sizes.isEmpty()) throw IllegalCallerException("sizes is empty!")
+    }
+
 
     class FaceSize(
         val start: Vec2,
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCulling.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCulling.kt
index 801feb180..88795a40e 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCulling.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/baked/cull/FaceCulling.kt
@@ -13,15 +13,19 @@
 
 package de.bixilon.minosoft.gui.rendering.models.block.state.baked.cull
 
+import de.bixilon.minosoft.data.direction.Directions
 import de.bixilon.minosoft.data.registries.blocks.state.BlockState
 import de.bixilon.minosoft.gui.rendering.models.block.state.baked.BakedFace
 
 object FaceCulling {
 
-    fun canCull(face: BakedFace, neighbour: BlockState?): Boolean {
+    fun canCull(face: BakedFace, direction: Directions, neighbour: BlockState?): Boolean {
         if (neighbour == null) return false
         if (!face.touchingSide) return false
 
+        val model = neighbour.model ?: return false
+        val size = model.getSize(direction) ?: return false
+
 
         return true // TODO
     }
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/builder/BuiltModel.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/builder/BuiltModel.kt
index a58730a4b..4856fe415 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/builder/BuiltModel.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/builder/BuiltModel.kt
@@ -37,4 +37,6 @@ class BuiltModel(
 
         return rendered
     }
+
+    // TODO: getSize/culling support
 }
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/BlockRender.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/BlockRender.kt
index 1107bf6e4..d0de08177 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/BlockRender.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/BlockRender.kt
@@ -14,8 +14,10 @@
 package de.bixilon.minosoft.gui.rendering.models.block.state.render
 
 import de.bixilon.kotlinglm.vec3.Vec3i
+import de.bixilon.minosoft.data.direction.Directions
 import de.bixilon.minosoft.data.registries.blocks.state.BlockState
 import de.bixilon.minosoft.data.world.positions.BlockPosition
+import de.bixilon.minosoft.gui.rendering.models.block.state.baked.SideSize
 import de.bixilon.minosoft.gui.rendering.system.base.texture.texture.AbstractTexture
 import de.bixilon.minosoft.gui.rendering.world.mesh.WorldMesh
 import java.util.*
@@ -24,4 +26,6 @@ interface BlockRender {
     fun getParticleTexture(random: Random?, position: Vec3i): AbstractTexture? = null
 
     fun render(position: BlockPosition, offset: FloatArray, mesh: WorldMesh, random: Random?, state: BlockState, neighbours: Array<BlockState?>, light: ByteArray, tints: IntArray?): Boolean
+
+    fun getSize(direction: Directions): SideSize? = null
 }
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/WeightedBlockRender.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/WeightedBlockRender.kt
index 54d5c2c92..4f5129b1b 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/WeightedBlockRender.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/models/block/state/render/WeightedBlockRender.kt
@@ -15,10 +15,12 @@ package de.bixilon.minosoft.gui.rendering.models.block.state.render
 
 import de.bixilon.kotlinglm.vec3.Vec3i
 import de.bixilon.kutil.exception.Broken
+import de.bixilon.minosoft.data.direction.Directions
 import de.bixilon.minosoft.data.registries.blocks.state.BlockState
 import de.bixilon.minosoft.data.world.positions.BlockPosition
 import de.bixilon.minosoft.data.world.positions.BlockPositionUtil.positionHash
 import de.bixilon.minosoft.gui.rendering.models.block.state.baked.BakedModel
+import de.bixilon.minosoft.gui.rendering.models.block.state.baked.SideSize
 import de.bixilon.minosoft.gui.rendering.system.base.texture.texture.AbstractTexture
 import de.bixilon.minosoft.gui.rendering.world.mesh.WorldMesh
 import java.util.*
@@ -28,7 +30,11 @@ class WeightedBlockRender(
     val models: Array<WeightedEntry>,
     val totalWeight: Int,
 ) : BlockRender {
+    private val size = models.getSize()
 
+    override fun getSize(direction: Directions): SideSize? {
+        return size[direction.ordinal] // TODO: get random block model
+    }
 
     private fun getModel(random: Random?, position: BlockPosition): BlockRender {
         if (random == null) return models.first().model
@@ -59,4 +65,33 @@ class WeightedBlockRender(
         val weight: Int,
         val model: BakedModel,
     )
+
+    private fun Array<WeightedEntry>.getSize(): Array<SideSize?> {
+        val sizes: Array<SideSize?> = arrayOfNulls(Directions.SIZE)
+        val skip = BooleanArray(Directions.SIZE)
+
+        for ((_, model) in this) {
+            for (direction in Directions) {
+                if (skip[direction.ordinal]) continue
+
+                val current = sizes[direction.ordinal]
+                val size = model.getSize(direction)
+                if (current == null) {
+                    sizes[direction.ordinal] = size
+                    continue
+                }
+                if (current != size) {
+                    skip[direction.ordinal] = true
+                    continue
+                }
+            }
+        }
+
+        for ((index, skip) in skip.withIndex()) {
+            if (!skip) continue
+            sizes[index] = null
+        }
+
+        return sizes
+    }
 }