diff --git a/jme3-core/src/main/java/com/jme3/shadow/AbstractShadowFilter.java b/jme3-core/src/main/java/com/jme3/shadow/AbstractShadowFilter.java
index b8e8d4a22b..cef214e185 100644
--- a/jme3-core/src/main/java/com/jme3/shadow/AbstractShadowFilter.java
+++ b/jme3-core/src/main/java/com/jme3/shadow/AbstractShadowFilter.java
@@ -32,10 +32,6 @@
 package com.jme3.shadow;
 
 import com.jme3.asset.AssetManager;
-import com.jme3.export.InputCapsule;
-import com.jme3.export.JmeExporter;
-import com.jme3.export.JmeImporter;
-import com.jme3.export.OutputCapsule;
 import com.jme3.material.Material;
 import com.jme3.material.RenderState;
 import com.jme3.math.Matrix4f;
@@ -48,19 +44,20 @@
 import com.jme3.util.clone.Cloner;
 import com.jme3.util.clone.JmeCloneable;
 
-import java.io.IOException;
-
 /**
  * Generic abstract filter that holds common implementations for the different
  * shadow filters
  *
- * @author Rémy Bouquet aka Nehon
+ * @author Nehon
  */
-public abstract class AbstractShadowFilter<T extends AbstractShadowRenderer> extends Filter implements Cloneable, JmeCloneable {
+public abstract class AbstractShadowFilter<T extends AbstractShadowRenderer> extends Filter implements JmeCloneable {
 
     protected T shadowRenderer;
     protected ViewPort viewPort;
 
+    private final Vector4f tempVec4 = new Vector4f();
+    private final Matrix4f tempMat4 = new Matrix4f();
+
     /**
      * For serialization only. Do not use.
      */
@@ -68,15 +65,13 @@ protected AbstractShadowFilter() {
     }
     
     /**
-     * Abstract class constructor
+     * Creates an AbstractShadowFilter. Subclasses invoke this constructor.
      *
-     * @param manager the application asset manager
-     * @param shadowMapSize the size of the rendered shadowmaps (512,1024,2048,
-     * etc...)
-     * @param shadowRenderer the shadowRenderer to use for this Filter
+     * @param assetManager The application's asset manager.
+     * @param shadowMapSize The size of the rendered shadow maps (e.g., 512, 1024, 2048).
+     * @param shadowRenderer The shadowRenderer to use for this Filter
      */
-    @SuppressWarnings("all")
-    protected AbstractShadowFilter(AssetManager manager, int shadowMapSize, T shadowRenderer) {
+    protected AbstractShadowFilter(AssetManager assetManager, int shadowMapSize, T shadowRenderer) {
         super("Post Shadow");
         this.shadowRenderer = shadowRenderer;
         // this is legacy setting for shadows with backface shadows
@@ -93,18 +88,12 @@ protected boolean isRequiresDepthTexture() {
         return true;
     }
 
-    public Material getShadowMaterial() {       
-        return material;
-    }
-
-    Vector4f tmpv = new Vector4f();
-
     @Override
     protected void preFrame(float tpf) {
         shadowRenderer.preFrame(tpf);
-        material.setMatrix4("ViewProjectionMatrixInverse", viewPort.getCamera().getViewProjectionMatrix().invert());
         Matrix4f m = viewPort.getCamera().getViewProjectionMatrix();
-        material.setVector4("ViewProjectionMatrixRow2", tmpv.set(m.m20, m.m21, m.m22, m.m23));
+        material.setMatrix4("ViewProjectionMatrixInverse", tempMat4.set(m).invertLocal());
+        material.setVector4("ViewProjectionMatrixRow2", tempVec4.set(m.m20, m.m21, m.m22, m.m23));
     }
 
     @Override
@@ -337,15 +326,4 @@ public void cloneFields(final Cloner cloner, final Object original) {
         shadowRenderer.setPostShadowMaterial(material);
     }
 
-    @Override
-    public void write(JmeExporter ex) throws IOException {
-        super.write(ex);
-        OutputCapsule oc = ex.getCapsule(this);
-    }
-
-    @Override
-    public void read(JmeImporter im) throws IOException {
-        super.read(im);
-        InputCapsule ic = im.getCapsule(this);
-    }
 }