diff --git a/core/.gitignore b/core/.gitignore
index 1c87580..8a42e92 100644
--- a/core/.gitignore
+++ b/core/.gitignore
@@ -18,4 +18,3 @@
 /textRenderer.class
 /texture.class
 /vector.class
-/mainThread$MathOperation.class
diff --git a/core/grid.java b/core/grid.java
index 100506c..91b7a68 100644
--- a/core/grid.java
+++ b/core/grid.java
@@ -54,6 +54,7 @@ public class grid {
 		}
 	}
 	
+	
 }
 
 
diff --git a/core/mainThread.java b/core/mainThread.java
index c86c258..83b31a4 100644
--- a/core/mainThread.java
+++ b/core/mainThread.java
@@ -496,7 +496,7 @@ public class mainThread extends JFrame implements KeyListener, ActionListener, M
 		while(System.currentTimeMillis()-lastDraw<frameInterval){
 			try {
 				Thread.sleep(1);
-				sleepTime++; 
+				sleepTime++;
 			} catch (InterruptedException e1) {
 				// TODO Auto-generated catch block
 				e1.printStackTrace();
diff --git a/core/polygon3D.java b/core/polygon3D.java
index 1d9903c..930db3f 100644
--- a/core/polygon3D.java
+++ b/core/polygon3D.java
@@ -49,7 +49,7 @@ public class polygon3D {
 	public solidObject parentObject;
 	
 	//A pool of vectors which will be used for vector arithmetic
-	public  static vector 
+	public  vector 
 		tempVector1 = new vector(0,0,0),
 		tempVector2 = new vector(0,0,0),
 		tempVector3 = new vector(0,0,0),
@@ -83,7 +83,7 @@ public class polygon3D {
 	public byte[] diffuse = new byte[3];
 	
 	//default light source
-	public static vector lightDirection = sunLight.lightDirection;
+	public vector lightDirection = sunLight.lightDirection;
 	
 	//the color of polygon if it is defined as soild 
 	public int color;
diff --git a/enemyAI/defenseManagerAI.java b/enemyAI/defenseManagerAI.java
index 634847a..c50c44c 100644
--- a/enemyAI/defenseManagerAI.java
+++ b/enemyAI/defenseManagerAI.java
@@ -107,6 +107,8 @@ public class defenseManagerAI {
 			}
 		}
 		
+		//go through all the player units on the mini map and deal with them accordingly
+		
 
 	}
 	
diff --git a/enemyAI/enemyCommander.java b/enemyAI/enemyCommander.java
index 530a6cc..1e779a1 100644
--- a/enemyAI/enemyCommander.java
+++ b/enemyAI/enemyCommander.java
@@ -60,7 +60,7 @@ public class enemyCommander {
 		thinkHardLikeHumanPlayer();
 		
 		
-		//drawVisionMap();
+		drawVisionMap();
 		
 		//reset tempBitmap;
 		for(int i = 0 ;i < tempBitmap.length; i++){
diff --git a/enemyAI/mapAwarenessAI.java b/enemyAI/mapAwarenessAI.java
index 2bfcf13..eee9d2a 100644
--- a/enemyAI/mapAwarenessAI.java
+++ b/enemyAI/mapAwarenessAI.java
@@ -5,6 +5,7 @@ import core.baseInfo;
 import core.mainThread;
 import entity.goldMine;
 import entity.solidObject;
+import core.vector;
 
 //1. scan revealed area for player's units and building
 //2. keep track of player's units
@@ -55,6 +56,12 @@ public class mapAwarenessAI {
 	public int[] playerExpensionInfo;
 	public int numberOfplayerMiningBases;
 	
+	public vector mainPlayerForceLocation;
+	public vector mainPlayerForceDirection;
+	public int mainPlayerForceSize;
+	public vector[] playerForceLocations;
+	public vector[] playerForceDirections;
+	public int[] playerForceSize;
 	
 	public mapAwarenessAI(baseInfo theBaseInfo, boolean[] visionMap){
 		this.theBaseInfo = theBaseInfo;
@@ -67,6 +74,20 @@ public class mapAwarenessAI {
 		
 		goldMines = mainThread.theAssetManager.goldMines;
 		playerExpensionInfo = new int[goldMines.length];
+		
+		mainPlayerForceLocation = new vector(0,0,0);
+		mainPlayerForceDirection = new vector(0,0,0);
+		mainPlayerForceSize = 0;
+		playerForceLocations = new vector[3];
+		playerForceDirections = new vector[3];
+		playerForceSize = new int[3];
+		
+		for(int i = 0; i < 3; i++) {
+			playerForceLocations[i] = new vector(0,0,0);
+			playerForceDirections[i] = new vector(0,0,0);
+			playerForceSize[i] = 0;
+		}
+		
 	}
 	
 	public void processAI(){
@@ -386,6 +407,8 @@ public class mapAwarenessAI {
         
         
         findTheMostVulnerablePlayerBase();
+        
+        findPlayerForceLocation();
        
 	}
 	
@@ -510,6 +533,60 @@ public class mapAwarenessAI {
 		
 		return playexpensionDefenseScore;
 	}
+	
+	//find the center of the biggest cluster of player units that are visible on the minimap. It will tells the AI which area is in danger of being attacked.
+	public void findPlayerForceLocation(){
+		mainPlayerForceLocation.set(0,0,0);
+		mainPlayerForceDirection.set(0,0,0);
+		mainPlayerForceSize = 0;
+		
+		for(int i = 0; i < playerForceLocations.length; i++) {
+			playerForceLocations[i].set(0,0,0);
+			playerForceDirections[i].set(0,0,0);
+			playerForceSize[i] = 0;
+		}
+		
+		
+		if(numberOfPlayerUnitsOnMinimap < 5)
+			return;	
+		
+		for(int i = 0; i < playerUnitInMinimap.length; i++) {
+			if(playerUnitInMinimap[i] == null)
+				continue;
+			float xPos = playerUnitInMinimap[i].centre.x;
+			float zPos = playerUnitInMinimap[i].centre.z;
+
+			for(int j = 0; j < playerForceLocations.length; j++) {
+				//always add the player unit location to the empty list
+				if(playerForceLocations[j].x == 0) {
+					playerForceLocations[j].add(playerUnitInMinimap[i].centre);
+					playerForceSize[j]++;
+					playerForceDirections[j].add(playerUnitInMinimap[i].movement);
+					break;
+				} 
+				float centerX = playerForceLocations[j].x/playerForceSize[j];
+				float centerZ = playerForceLocations[j].z/playerForceSize[j];
+				float d = (centerX - xPos) * (centerX - xPos) + (centerZ - zPos) * (centerZ - zPos);
+				//if the player unit is close enough to the force center then add it to the list
+				if(d < 4) {
+					playerForceLocations[j].add(playerUnitInMinimap[i].centre);
+					playerForceSize[j]++;
+					playerForceDirections[j].add(playerUnitInMinimap[i].movement);
+					break;
+				}
+			}
+		}
+		
+		for(int i = 0; i < playerForceLocations.length; i++) {
+			if(playerForceSize[i] > mainPlayerForceSize) {
+				mainPlayerForceSize = playerForceSize[i];
+				mainPlayerForceLocation.set(playerForceLocations[i].x/mainPlayerForceSize,0,playerForceLocations[i].z/mainPlayerForceSize);
+				mainPlayerForceDirection.set(playerForceDirections[i].x/mainPlayerForceSize, 0, playerForceDirections[i].z/mainPlayerForceSize);
+			}
+		}
+		
+		System.out.println(mainPlayerForceSize  + "   "  + mainPlayerForceLocation + "    "  + mainPlayerForceDirection);
+	}
 
 	
 }
diff --git a/enemyAI/unitProductionAI.java b/enemyAI/unitProductionAI.java
index b9e29e1..0072e4e 100644
--- a/enemyAI/unitProductionAI.java
+++ b/enemyAI/unitProductionAI.java
@@ -73,7 +73,7 @@ public class unitProductionAI {
 	public void processAI(){
 		frameAI++;
 		
-		//set the rally point to near the construction yard which is closest to the player's starting position
+		//set the rally point to near the construction yard which is closest to the AI player's starting position
 		float x = 0;
 		float z = 999999;
 		
@@ -81,7 +81,7 @@ public class unitProductionAI {
 		for(int i = 0; i < mainThread.theAssetManager.constructionYards.length; i++){
 			if(mainThread.theAssetManager.constructionYards[i] != null && mainThread.theAssetManager.constructionYards[i].currentHP > 0 &&  mainThread.theAssetManager.constructionYards[i].teamNo != 0){
 				index = i;
-				if(mainThread.theAssetManager.constructionYards[i].centre.z < z && mainThread.theAssetManager.constructionYards[i].centre.z > 5 && mainThread.theAssetManager.constructionYards[i].centre.x > 5){
+				if(mainThread.theAssetManager.constructionYards[i].centre.z < z && mainThread.theAssetManager.constructionYards[i].centre.z > 7 && mainThread.theAssetManager.constructionYards[i].centre.x > 7){
 					x = mainThread.theAssetManager.constructionYards[i].centre.x;
 					z = mainThread.theAssetManager.constructionYards[i].centre.z;
 				}