diff --git a/server/src/main/java/server/clipboard/BlockTransform.java b/server/src/main/java/server/clipboard/Mat2i.java
similarity index 70%
rename from server/src/main/java/server/clipboard/BlockTransform.java
rename to server/src/main/java/server/clipboard/Mat2i.java
index b8c15789..bc6c5eae 100755
--- a/server/src/main/java/server/clipboard/BlockTransform.java
+++ b/server/src/main/java/server/clipboard/Mat2i.java
@@ -1,25 +1,25 @@
 package server.clipboard;
 
-public class BlockTransform {
+public class Mat2i {
 	private final int xx;
 	private final int zx;
 	private final int xz;
 	private final int zz;
 
-	public BlockTransform(int theta, boolean x, boolean z) {
-		int cot = dCos(theta);
-		int sit = dSin(theta);
-		this.xx = cot * (x ? -1 : 1);
-		this.zx = sit * (z ? -1 : 1);
-		this.xz = -sit * (x ? -1 : 1);
-		this.zz = cot * (z ? -1 : 1);
+	public Mat2i(int rotationY, boolean flipX, boolean flipZ) {
+		int cot = dCos(-rotationY);
+		int sit = dSin(-rotationY);
+		this.xx = cot * (flipX ? -1 : 1);
+		this.zx = sit * (flipZ ? -1 : 1);
+		this.xz = -sit * (flipX ? -1 : 1);
+		this.zz = cot * (flipZ ? -1 : 1);
 	}
 
-	public int applyX(int x, int z) {
+	public int mulX(int x, int z) {
 		return x * this.xx + z * this.zx;
 	}
 
-	public int applyZ(int x, int z) {
+	public int mulZ(int x, int z) {
 		return x * this.xz + z * this.zz;
 	}
 
diff --git a/server/src/main/java/server/network/Player.java b/server/src/main/java/server/network/Player.java
index bdc12ee8..231e585a 100755
--- a/server/src/main/java/server/network/Player.java
+++ b/server/src/main/java/server/network/Player.java
@@ -121,7 +121,7 @@ import common.world.BlockArray;
 import common.world.State;
 import common.world.World;
 import server.Server;
-import server.clipboard.BlockTransform;
+import server.clipboard.Mat2i;
 import server.clipboard.ClipboardBlock;
 import server.clipboard.ClipboardPlacer;
 import server.clipboard.RotationRegistry;
@@ -1419,9 +1419,9 @@ public class Player extends User implements ICrafting, Executor, IPlayer
 		int nz = this.clipboard[0][0].length;
 		BlockPos to = this.entity.getPosition();
 		ClipboardPlacer placer = new ClipboardPlacer(this.getEntityWorld());
-		BlockTransform transform = null;
+		Mat2i transform = null;
 		if(this.rotation != 0 || this.flipX || this.flipZ) {
-			transform = new BlockTransform(-this.rotation, this.flipX, this.flipZ);
+			transform = new Mat2i(this.rotation, this.flipX, this.flipZ);
 		}
 		else {
 			to = to.add(this.selOffset);
@@ -1434,21 +1434,21 @@ public class Player extends User implements ICrafting, Executor, IPlayer
             		}
             		else {
 	            		ClipboardBlock block = transformBlock(transform, this.clipboard[x][y][z]);
-	                    placer.setBlock(to.add(transform.applyX(x + this.selOffset.getX(), z + this.selOffset.getZ()), y + this.selOffset.getY(), 
-	                    		transform.applyZ(x + this.selOffset.getX(), z + this.selOffset.getZ())), block);
+	                    placer.setBlock(to.add(transform.mulX(x + this.selOffset.getX(), z + this.selOffset.getZ()), y + this.selOffset.getY(), 
+	                    		transform.mulZ(x + this.selOffset.getX(), z + this.selOffset.getZ())), block);
             		}
             	}
         	}
     	}
     	if(transform != null) {
-    		to = to.add(transform.applyX(this.selOffset.getX(), this.selOffset.getZ()), this.selOffset.getY(), transform.applyZ(this.selOffset.getX(), this.selOffset.getZ()));
+    		to = to.add(transform.mulX(this.selOffset.getX(), this.selOffset.getZ()), this.selOffset.getY(), transform.mulZ(this.selOffset.getX(), this.selOffset.getZ()));
     	}
     	placer.commit();
     	this.addHotbar(TextColor.YELLOW + "Zwischenablage wurde bei %d, %d, %d eingefügt", to.getX(), to.getY(), to.getZ());
         return true;
     }
     
-    private static ClipboardBlock transformBlock(BlockTransform transform, ClipboardBlock block) {
+    private static ClipboardBlock transformBlock(Mat2i transform, ClipboardBlock block) {
     	RotationValue[] state = RotationRegistry.getRotation(block.getState().getBlock());
         if(state == null)
             return block;
@@ -1469,9 +1469,9 @@ public class Player extends User implements ICrafting, Executor, IPlayer
         return (x1 / l1) * (x2 / l2) + (z1 / l1) * (z2 / l2);
     }
     
-    private static RotationValue getNewRotation(BlockTransform transform, RotationValue[] state, RotationValue value) {
-    	int x = transform.applyX(value.getX(), value.getZ());
-    	int z = transform.applyZ(value.getX(), value.getZ());
+    private static RotationValue getNewRotation(Mat2i transform, RotationValue[] state, RotationValue value) {
+    	int x = transform.mulX(value.getX(), value.getZ());
+    	int z = transform.mulZ(value.getX(), value.getZ());
         RotationValue newValue = null;
         double closest = -2;
         for(RotationValue v : state) {