diff --git a/src/gl_engine/graphics/GraphicsHelpers.java b/src/gl_engine/graphics/GraphicsHelpers.java
index b9867f6..f0f6507 100644
--- a/src/gl_engine/graphics/GraphicsHelpers.java
+++ b/src/gl_engine/graphics/GraphicsHelpers.java
@@ -19,6 +19,7 @@ import static org.lwjgl.opengl.GL11.glEnable;
 import static org.lwjgl.opengl.GL11.glViewport;
 
 import org.lwjgl.opengl.GL;
+import org.lwjgl.opengl.GL33;
 
 public class GraphicsHelpers
 {
diff --git a/src/gl_engine/matrix/Matrix4.java b/src/gl_engine/matrix/Matrix4.java
index 4bd05ac..a1765fd 100644
--- a/src/gl_engine/matrix/Matrix4.java
+++ b/src/gl_engine/matrix/Matrix4.java
@@ -102,13 +102,12 @@ public class Matrix4 implements IBdfClassManager
 	
 	public static Vec3d multiply(Matrix4 mat, Vec3d vec)
 	{
-		Vec3d result = new Vec3d(0, 0, 0);
+		double x = mat.get(0, 0) * vec.x + mat.get(1, 0) * vec.y + mat.get(2, 0) * vec.z + mat.get(3, 0);
+		double y = mat.get(0, 1) * vec.x + mat.get(1, 1) * vec.y + mat.get(2, 1) * vec.z + mat.get(3, 1);
+		double z = mat.get(0, 2) * vec.x + mat.get(1, 2) * vec.y + mat.get(2, 2) * vec.z + mat.get(3, 2);
+		double m = mat.get(0, 3) * vec.x + mat.get(1, 3) * vec.y + mat.get(2, 3) * vec.z + mat.get(3, 3);
 		
-		result.x = mat.get(0, 0) * vec.x + mat.get(1, 0) * vec.y + mat.get(2, 0) * vec.z + mat.get(3, 0);
-		result.y = mat.get(0, 1) * vec.x + mat.get(1, 1) * vec.y + mat.get(2, 1) * vec.z + mat.get(3, 1);
-		result.z = mat.get(0, 2) * vec.x + mat.get(1, 2) * vec.y + mat.get(2, 2) * vec.z + mat.get(3, 2);
-		
-		return result;
+		return new Vec3d(x / m, y / m, z / m);
 	}
 	
 	public static Matrix4 transform(Vec3d position, Vec3d rotation, Vec3d scale)
diff --git a/src/gl_engine/vec/Vec2d.java b/src/gl_engine/vec/Vec2d.java
index e3fb8bf..084b09c 100755
--- a/src/gl_engine/vec/Vec2d.java
+++ b/src/gl_engine/vec/Vec2d.java
@@ -76,11 +76,8 @@ public class Vec2d implements IBdfClassManager
 		return new Vec2d(x, y);
 	}
 	
-	public double squareDistance(Vec2d other)
-	{
-		double dx = MathHelpers.positive(other.x - x);
-		double dy = MathHelpers.positive(other.y - y);
-		return MathHelpers.biggest(dx, dy);
+	public double squareDistance(Vec2d other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y);
 	}
 	
 	public Vec2i toInt() {
diff --git a/src/gl_engine/vec/Vec2i.java b/src/gl_engine/vec/Vec2i.java
index a0a80fe..40eb8b4 100755
--- a/src/gl_engine/vec/Vec2i.java
+++ b/src/gl_engine/vec/Vec2i.java
@@ -89,11 +89,8 @@ public class Vec2i implements IBdfClassManager
 		return new Vec2i(x, y);
 	}
 	
-	public double squareDistance(Vec2i other)
-	{
-		int dx = MathHelpers.positive(other.x - x);
-		int dy = MathHelpers.positive(other.y - y);
-		return MathHelpers.biggest(dx, dy);
+	public double squareDistance(Vec2i other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y);
 	}
 	
 	public Vec2d toDouble() {
diff --git a/src/gl_engine/vec/Vec3d.java b/src/gl_engine/vec/Vec3d.java
index 4ad80a7..a3ce3cf 100755
--- a/src/gl_engine/vec/Vec3d.java
+++ b/src/gl_engine/vec/Vec3d.java
@@ -86,15 +86,8 @@ public class Vec3d implements IBdfClassManager
 		return new Vec3d(x, y, z);
 	}
 	
-	public double squareDistance(Vec3d other)
-	{
-		double dx = MathHelpers.positive(other.x - x);
-		double dy = MathHelpers.positive(other.y - y);
-		double dz = MathHelpers.positive(other.z - z);
-		
-		if(dx > dy) return dx;
-		if(dy > dz) return dy;
-		else return dz;
+	public double squareDistance(Vec3d other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y) + Math.abs(other.z - z);
 	}
 	
 	public Vec3i toInt() {
diff --git a/src/gl_engine/vec/Vec3i.java b/src/gl_engine/vec/Vec3i.java
index e1f8bf3..c65a7b8 100755
--- a/src/gl_engine/vec/Vec3i.java
+++ b/src/gl_engine/vec/Vec3i.java
@@ -105,15 +105,8 @@ public class Vec3i implements IBdfClassManager
 		return new Vec3i(x, y, z);
 	}
 	
-	public int squareDistance(Vec3i other)
-	{
-		int dx = MathHelpers.positive(other.x - x);
-		int dy = MathHelpers.positive(other.y - y);
-		int dz = MathHelpers.positive(other.z - z);
-		
-		if(dx > dy) return dx;
-		if(dy > dz) return dy;
-		else return dz;
+	public int squareDistance(Vec3i other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y) + Math.abs(other.z - z);
 	}
 	
 	public Vec3d toDouble() {
diff --git a/src/gl_engine/vec/Vec4d.java b/src/gl_engine/vec/Vec4d.java
index a834c3e..bdd2f1c 100755
--- a/src/gl_engine/vec/Vec4d.java
+++ b/src/gl_engine/vec/Vec4d.java
@@ -108,17 +108,8 @@ public class Vec4d implements IBdfClassManager
 		return new Vec4d(x, y, z, m);
 	}
 	
-	public double squareDistance(Vec4d other)
-	{
-		double dx = MathHelpers.positive(other.x - x);
-		double dy = MathHelpers.positive(other.y - y);
-		double dz = MathHelpers.positive(other.z - z);
-		double dm = MathHelpers.positive(other.m - m);
-		
-		if(dx > dy) return dx;
-		if(dy > dz) return dy;
-		if(dz > dm) return dz;
-		else return dm;
+	public double squareDistance(Vec4d other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y) + Math.abs(other.z - z) + Math.abs(other.m - m);
 	}
 	
 	public Vec4i toInt() {
diff --git a/src/gl_engine/vec/Vec4i.java b/src/gl_engine/vec/Vec4i.java
index ba06af3..f736ebb 100755
--- a/src/gl_engine/vec/Vec4i.java
+++ b/src/gl_engine/vec/Vec4i.java
@@ -133,17 +133,8 @@ public class Vec4i implements IBdfClassManager
 		return new Vec4i(x, y, z, m);
 	}
 	
-	public int squareDistance(Vec4i other)
-	{
-		int dx = MathHelpers.positive(other.x - x);
-		int dy = MathHelpers.positive(other.y - y);
-		int dz = MathHelpers.positive(other.z - z);
-		int dm = MathHelpers.positive(other.m - m);
-		
-		if(dx > dy) return dx;
-		if(dy > dz) return dy;
-		if(dz > dm) return dz;
-		else return dm;
+	public int squareDistance(Vec4i other) {
+		return Math.abs(other.x - x) + Math.abs(other.y - y) + Math.abs(other.z - z) + Math.abs(other.m - m);
 	}
 	
 	public Vec4d toDouble() {