diff --git a/src/mightypork/rogue/screens/test_bouncyboxes/BouncyBox.java b/src/mightypork/rogue/screens/test_bouncyboxes/BouncyBox.java
index fbd7c22..2fe23f9 100644
--- a/src/mightypork/rogue/screens/test_bouncyboxes/BouncyBox.java
+++ b/src/mightypork/rogue/screens/test_bouncyboxes/BouncyBox.java
@@ -9,8 +9,8 @@ import mightypork.gamecore.gui.components.SimplePainter;
 import mightypork.gamecore.render.Render;
 import mightypork.utils.math.Easing;
 import mightypork.utils.math.color.RGB;
-import mightypork.utils.math.constraints.num.NumAnimated;
 import mightypork.utils.math.constraints.num.Num;
+import mightypork.utils.math.constraints.num.NumAnimated;
 import mightypork.utils.math.constraints.rect.Rect;
 
 
diff --git a/src/mightypork/rogue/screens/test_cat_sound/LayerFlyingCat.java b/src/mightypork/rogue/screens/test_cat_sound/LayerFlyingCat.java
index e69dece..239e787 100644
--- a/src/mightypork/rogue/screens/test_cat_sound/LayerFlyingCat.java
+++ b/src/mightypork/rogue/screens/test_cat_sound/LayerFlyingCat.java
@@ -16,8 +16,8 @@ import mightypork.gamecore.render.fonts.FontRenderer.Align;
 import mightypork.rogue.Res;
 import mightypork.utils.math.Easing;
 import mightypork.utils.math.color.RGB;
-import mightypork.utils.math.constraints.num.NumAnimated;
 import mightypork.utils.math.constraints.num.Num;
+import mightypork.utils.math.constraints.num.NumAnimated;
 import mightypork.utils.math.constraints.rect.Rect;
 import mightypork.utils.math.constraints.vect.Vect;
 import mightypork.utils.math.constraints.vect.VectAnimated;
diff --git a/src/mightypork/test/TestConstCaching.java b/src/mightypork/test/TestConstCaching.java
new file mode 100644
index 0000000..67d4dbd
--- /dev/null
+++ b/src/mightypork/test/TestConstCaching.java
@@ -0,0 +1,39 @@
+package mightypork.test;
+
+import mightypork.utils.math.constraints.vect.Vect;
+import mightypork.utils.math.constraints.vect.VectCache;
+import mightypork.utils.math.constraints.vect.VectVar;
+
+
+public class TestConstCaching {
+	public static void main(String[] args)
+	{
+		VectVar in = Vect.makeVar(0, 0);
+		VectCache cache = in.cached();
+		cache.enableDigestCaching(true);
+
+		System.out.println("in = "+in);
+		System.out.println("cache = "+cache);
+		System.out.println("cache digest = " + cache.digest());
+		System.out.println("\n-- in := 100, 50, 25 --\n");
+		in.setTo(100,50,25);
+		System.out.println("in = "+in);
+		System.out.println("cache = "+cache);
+		System.out.println("cache digest = " + cache.digest());
+		System.out.println("\n-- cache.poll() --\n");
+		cache.poll();
+		System.out.println("in = "+in);
+		System.out.println("cache = "+cache);
+		System.out.println("cache digest = " + cache.digest());
+		System.out.println("\n-- in := 1, 2, 3 --\n");
+		in.setTo(1,2,3);
+		System.out.println("in = "+in);
+		System.out.println("cache = "+cache);
+		System.out.println("cache digest = " + cache.digest());
+		System.out.println("\n-- cache.poll() --\n");
+		cache.poll();
+		System.out.println("cache = "+cache);
+		System.out.println("cache digest = " + cache.digest());
+		
+	}
+}
diff --git a/src/mightypork/utils/math/constraints/num/Num.java b/src/mightypork/utils/math/constraints/num/Num.java
index 59c813e..b068227 100644
--- a/src/mightypork/utils/math/constraints/num/Num.java
+++ b/src/mightypork/utils/math/constraints/num/Num.java
@@ -62,8 +62,9 @@ public abstract class Num implements NumBound, Digestable<NumDigest> {
 	private Num p_square;
 	private Num p_neg;
 	private Num p_abs;
-	private NumDigest lastDigest;
-	private boolean digestCachingEnabled;
+	private NumDigest lastDigest = null;
+	private boolean digestCachingEnabled = false;
+	private boolean digestDirty = true;
 	
 	
 	public NumConst freeze()
@@ -72,6 +73,18 @@ public abstract class Num implements NumBound, Digestable<NumDigest> {
 	}
 	
 	
+	/**
+	 * Wrap this constraint into a caching adapter. Value will stay fixed (ie.
+	 * no re-calculations) until cache receives a poll() call.
+	 * 
+	 * @return the caching adapter
+	 */
+	public NumCache cached()
+	{
+		return new NumCache(this);
+	}
+	
+	
 	/**
 	 * Get a snapshot of the current state, to be used for processing.
 	 * 
@@ -81,9 +94,16 @@ public abstract class Num implements NumBound, Digestable<NumDigest> {
 	@Override
 	public NumDigest digest()
 	{
-		if (digestCachingEnabled && lastDigest != null) return lastDigest;
+		if (digestCachingEnabled) {
+			if (digestDirty) {
+				lastDigest = new NumDigest(this);
+				digestDirty = false;
+			}
+			
+			return lastDigest;
+		}
 		
-		return lastDigest = new NumDigest(this);
+		return new NumDigest(this);
 	}
 	
 	
@@ -91,12 +111,10 @@ public abstract class Num implements NumBound, Digestable<NumDigest> {
 	public void enableDigestCaching(boolean yes)
 	{
 		digestCachingEnabled = yes;
+		digestDirty = true; // schedule update nest time digest() is called
 	}
 	
 	
-	/**
-	 * @return true if digest caching is enabled.
-	 */
 	@Override
 	public boolean isDigestCachingEnabled()
 	{
@@ -107,7 +125,7 @@ public abstract class Num implements NumBound, Digestable<NumDigest> {
 	@Override
 	public void poll()
 	{
-		if (digestCachingEnabled) lastDigest = new NumDigest(this);
+		if (digestCachingEnabled) digestDirty = true;
 	}
 	
 	
diff --git a/src/mightypork/utils/math/constraints/num/NumAnimatedDeg.java b/src/mightypork/utils/math/constraints/num/NumAnimatedDeg.java
index 7549eb2..f3278f0 100644
--- a/src/mightypork/utils/math/constraints/num/NumAnimatedDeg.java
+++ b/src/mightypork/utils/math/constraints/num/NumAnimatedDeg.java
@@ -2,8 +2,8 @@ package mightypork.utils.math.constraints.num;
 
 
 import mightypork.utils.math.Calc;
-import mightypork.utils.math.Easing;
 import mightypork.utils.math.Calc.Deg;
+import mightypork.utils.math.Easing;
 
 
 /**
diff --git a/src/mightypork/utils/math/constraints/num/NumAnimatedRad.java b/src/mightypork/utils/math/constraints/num/NumAnimatedRad.java
index cd7df9c..414ad46 100644
--- a/src/mightypork/utils/math/constraints/num/NumAnimatedRad.java
+++ b/src/mightypork/utils/math/constraints/num/NumAnimatedRad.java
@@ -2,8 +2,8 @@ package mightypork.utils.math.constraints.num;
 
 
 import mightypork.utils.math.Calc;
-import mightypork.utils.math.Easing;
 import mightypork.utils.math.Calc.Rad;
+import mightypork.utils.math.Easing;
 
 
 /**
diff --git a/src/mightypork/utils/math/constraints/num/NumBound.java b/src/mightypork/utils/math/constraints/num/NumBound.java
index 2f18266..911fd0b 100644
--- a/src/mightypork/utils/math/constraints/num/NumBound.java
+++ b/src/mightypork/utils/math/constraints/num/NumBound.java
@@ -1,7 +1,6 @@
 package mightypork.utils.math.constraints.num;
 
 
-
 /**
  * Numeric constraint
  * 
diff --git a/src/mightypork/utils/math/constraints/num/NumBoundAdapter.java b/src/mightypork/utils/math/constraints/num/NumBoundAdapter.java
index ada4955..e702c1b 100644
--- a/src/mightypork/utils/math/constraints/num/NumBoundAdapter.java
+++ b/src/mightypork/utils/math/constraints/num/NumBoundAdapter.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.num;
 
 
-
-
 public class NumBoundAdapter extends NumAdapter implements PluggableNumBound {
 	
 	private NumBound backing = null;
diff --git a/src/mightypork/utils/math/constraints/num/NumCache.java b/src/mightypork/utils/math/constraints/num/NumCache.java
new file mode 100644
index 0000000..435a01f
--- /dev/null
+++ b/src/mightypork/utils/math/constraints/num/NumCache.java
@@ -0,0 +1,37 @@
+package mightypork.utils.math.constraints.num;
+
+
+public class NumCache extends NumAdapter {
+	
+	private final NumVar cache = Num.makeVar();
+	private final Num source;
+	private boolean inited = false;
+	
+	
+	public NumCache(Num source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Num getSource()
+	{
+		if (!inited) poll();
+		
+		return cache;
+	}
+	
+	
+	/**
+	 * Update cached value and cached digest (if digest caching is enabled)
+	 */
+	@Override
+	public void poll()
+	{
+		inited = true;
+		cache.setTo(source);
+		
+		super.poll();
+	}
+	
+}
diff --git a/src/mightypork/utils/math/constraints/num/NumProxy.java b/src/mightypork/utils/math/constraints/num/NumProxy.java
new file mode 100644
index 0000000..27d0d12
--- /dev/null
+++ b/src/mightypork/utils/math/constraints/num/NumProxy.java
@@ -0,0 +1,20 @@
+package mightypork.utils.math.constraints.num;
+
+
+public class NumProxy extends NumAdapter {
+	
+	private final Num source;
+	
+	
+	public NumProxy(Num source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Num getSource()
+	{
+		return source;
+	}
+	
+}
diff --git a/src/mightypork/utils/math/constraints/num/PluggableNumBound.java b/src/mightypork/utils/math/constraints/num/PluggableNumBound.java
index ba71230..597b861 100644
--- a/src/mightypork/utils/math/constraints/num/PluggableNumBound.java
+++ b/src/mightypork/utils/math/constraints/num/PluggableNumBound.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.num;
 
 
-
-
 /**
  * Pluggable numeric constraint
  * 
diff --git a/src/mightypork/utils/math/constraints/rect/Rect.java b/src/mightypork/utils/math/constraints/rect/Rect.java
index db92f16..e0610e8 100644
--- a/src/mightypork/utils/math/constraints/rect/Rect.java
+++ b/src/mightypork/utils/math/constraints/rect/Rect.java
@@ -161,6 +161,7 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	
 	private RectDigest lastDigest = null;
 	private boolean digestCachingEnabled = false;
+	private boolean digestDirty = true; // digest is null
 	
 	
 	/**
@@ -175,12 +176,31 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	}
 	
 	
+	/**
+	 * Wrap this constraint into a caching adapter. Value will stay fixed (ie.
+	 * no re-calculations) until cache receives a poll() call.
+	 * 
+	 * @return the caching adapter
+	 */
+	public RectCache cached()
+	{
+		return new RectCache(this);
+	}
+	
+	
 	@Override
 	public RectDigest digest()
 	{
-		if (digestCachingEnabled && lastDigest != null) return lastDigest;
+		if (digestCachingEnabled) {
+			if (digestDirty) {
+				lastDigest = new RectDigest(this);
+				digestDirty = false;
+			}
+			
+			return lastDigest;
+		}
 		
-		return lastDigest = new RectDigest(this);
+		return new RectDigest(this);
 	}
 	
 	
@@ -188,12 +208,10 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	public void enableDigestCaching(boolean yes)
 	{
 		digestCachingEnabled = yes;
+		digestDirty = true; // schedule update nest time digest() is called
 	}
 	
 	
-	/**
-	 * @return true if digest caching is enabled.
-	 */
 	@Override
 	public boolean isDigestCachingEnabled()
 	{
@@ -204,7 +222,7 @@ public abstract class Rect implements RectBound, Digestable<RectDigest> {
 	@Override
 	public void poll()
 	{
-		if (digestCachingEnabled) lastDigest = new RectDigest(this);
+		if (digestCachingEnabled) digestDirty = true;
 	}
 	
 	
diff --git a/src/mightypork/utils/math/constraints/rect/RectBound.java b/src/mightypork/utils/math/constraints/rect/RectBound.java
index a112c41..99cd04b 100644
--- a/src/mightypork/utils/math/constraints/rect/RectBound.java
+++ b/src/mightypork/utils/math/constraints/rect/RectBound.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.rect;
 
 
-
-
 /**
  * Rect constraint (ie. region)
  * 
diff --git a/src/mightypork/utils/math/constraints/rect/RectBoundAdapter.java b/src/mightypork/utils/math/constraints/rect/RectBoundAdapter.java
index deabf5a..96f3247 100644
--- a/src/mightypork/utils/math/constraints/rect/RectBoundAdapter.java
+++ b/src/mightypork/utils/math/constraints/rect/RectBoundAdapter.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.rect;
 
 
-
-
 /**
  * Pluggable rect bound adapter
  * 
diff --git a/src/mightypork/utils/math/constraints/rect/RectCache.java b/src/mightypork/utils/math/constraints/rect/RectCache.java
new file mode 100644
index 0000000..83e0f60
--- /dev/null
+++ b/src/mightypork/utils/math/constraints/rect/RectCache.java
@@ -0,0 +1,37 @@
+package mightypork.utils.math.constraints.rect;
+
+
+public class RectCache extends RectAdapter {
+	
+	private final RectVar cache = Rect.makeVar();
+	private final Rect source;
+	private boolean inited = false;
+	
+	
+	public RectCache(Rect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Rect getSource()
+	{
+		if (!inited) poll();
+		
+		return cache;
+	}
+	
+	
+	/**
+	 * Update cached value and cached digest (if digest caching is enabled)
+	 */
+	@Override
+	public void poll()
+	{
+		inited = true;
+		cache.setTo(source);
+		
+		super.poll();
+	}
+	
+}
diff --git a/src/mightypork/utils/math/constraints/rect/RectDigest.java b/src/mightypork/utils/math/constraints/rect/RectDigest.java
index 70dcf85..f3d4259 100644
--- a/src/mightypork/utils/math/constraints/rect/RectDigest.java
+++ b/src/mightypork/utils/math/constraints/rect/RectDigest.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.rect;
 
 
-
-
 public class RectDigest {
 	
 	public final double x;
diff --git a/src/mightypork/utils/math/constraints/vect/Vect.java b/src/mightypork/utils/math/constraints/vect/Vect.java
index a6b0e85..5e5dda8 100644
--- a/src/mightypork/utils/math/constraints/vect/Vect.java
+++ b/src/mightypork/utils/math/constraints/vect/Vect.java
@@ -104,8 +104,9 @@ public abstract class Vect implements VectBound, Digestable<VectDigest> {
 	private Num p_xc;
 	private Num p_yc;
 	private Num p_zc;
-	private boolean digestCachingEnabled;
-	private VectDigest lastDigest;
+	private VectDigest lastDigest = null;
+	private boolean digestCachingEnabled = false;
+	private boolean digestDirty = true; // it's null
 	
 	
 	/**
@@ -238,12 +239,31 @@ public abstract class Vect implements VectBound, Digestable<VectDigest> {
 	}
 	
 	
+	/**
+	 * Wrap this constraint into a caching adapter. Value will stay fixed (ie.
+	 * no re-calculations) until cache receives a poll() call.
+	 * 
+	 * @return the caching adapter
+	 */
+	public VectCache cached()
+	{
+		return new VectCache(this);
+	}
+	
+	
 	@Override
 	public VectDigest digest()
 	{
-		if (digestCachingEnabled && lastDigest != null) return lastDigest;
+		if (digestCachingEnabled) {
+			if (digestDirty) {
+				lastDigest = new VectDigest(this);
+				digestDirty = false;
+			}
+			
+			return lastDigest;
+		}
 		
-		return lastDigest = new VectDigest(this);
+		return new VectDigest(this);
 	}
 	
 	
@@ -251,6 +271,7 @@ public abstract class Vect implements VectBound, Digestable<VectDigest> {
 	public void enableDigestCaching(boolean yes)
 	{
 		digestCachingEnabled = yes;
+		digestDirty = true; // schedule update nest time digest() is called
 	}
 	
 	
@@ -264,7 +285,7 @@ public abstract class Vect implements VectBound, Digestable<VectDigest> {
 	@Override
 	public void poll()
 	{
-		if (digestCachingEnabled) lastDigest = new VectDigest(this);
+		if (digestCachingEnabled) digestDirty = true;
 	}
 	
 	
@@ -1036,7 +1057,7 @@ public abstract class Vect implements VectBound, Digestable<VectDigest> {
 	 * @param vec other vector
 	 * @return result
 	 */
-	public final Vect cross(final Vect vec)
+	public Vect cross(final Vect vec)
 	{
 		return new Vect() {
 			
diff --git a/src/mightypork/utils/math/constraints/vect/VectBound.java b/src/mightypork/utils/math/constraints/vect/VectBound.java
index 08c4014..678c57f 100644
--- a/src/mightypork/utils/math/constraints/vect/VectBound.java
+++ b/src/mightypork/utils/math/constraints/vect/VectBound.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.vect;
 
 
-
-
 /**
  * Element holding a vector, used for constraint building.
  * 
diff --git a/src/mightypork/utils/math/constraints/vect/VectBoundAdapter.java b/src/mightypork/utils/math/constraints/vect/VectBoundAdapter.java
index 43b1055..abbc96e 100644
--- a/src/mightypork/utils/math/constraints/vect/VectBoundAdapter.java
+++ b/src/mightypork/utils/math/constraints/vect/VectBoundAdapter.java
@@ -1,8 +1,6 @@
 package mightypork.utils.math.constraints.vect;
 
 
-
-
 public class VectBoundAdapter extends VectAdapter implements PluggableVectBound {
 	
 	private VectBound backing = null;
diff --git a/src/mightypork/utils/math/constraints/vect/VectCache.java b/src/mightypork/utils/math/constraints/vect/VectCache.java
new file mode 100644
index 0000000..daa0cd2
--- /dev/null
+++ b/src/mightypork/utils/math/constraints/vect/VectCache.java
@@ -0,0 +1,37 @@
+package mightypork.utils.math.constraints.vect;
+
+
+public class VectCache extends VectAdapter {
+	
+	private final VectVar cache = Vect.makeVar();
+	private final Vect source;
+	private boolean inited = false;
+	
+	
+	public VectCache(Vect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Vect getSource()
+	{
+		if (!inited) poll();
+		
+		return cache;
+	}
+	
+	
+	/**
+	 * Update cached value and cached digest (if digest caching is enabled)
+	 */
+	@Override
+	public void poll()
+	{
+		inited = true;
+		cache.setTo(source);
+		
+		super.poll();
+	}
+	
+}
diff --git a/src/mightypork/utils/math/constraints/vect/VectConst.java b/src/mightypork/utils/math/constraints/vect/VectConst.java
index 2e5b758..6d616a6 100644
--- a/src/mightypork/utils/math/constraints/vect/VectConst.java
+++ b/src/mightypork/utils/math/constraints/vect/VectConst.java
@@ -351,6 +351,12 @@ public final class VectConst extends Vect {
 	}
 	
 	
+	public VectConst cross(VectConst vec)
+	{
+		return super.cross(vec).freeze();
+	}
+	
+	
 	@Override
 	public RectConst expand(double left, double right, double top, double bottom)
 	{
diff --git a/src/mightypork/utils/math/constraints/vect/VectProxy.java b/src/mightypork/utils/math/constraints/vect/VectProxy.java
new file mode 100644
index 0000000..bc12bd9
--- /dev/null
+++ b/src/mightypork/utils/math/constraints/vect/VectProxy.java
@@ -0,0 +1,20 @@
+package mightypork.utils.math.constraints.vect;
+
+
+public class VectProxy extends VectAdapter {
+	
+	private final Vect source;
+	
+	
+	public VectProxy(Vect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Vect getSource()
+	{
+		return source;
+	}
+	
+}