Fixed an issue where you couldn't chain several shadow renderers. Thanks to Perjin for narrowing down the issue.

Now a shadow renderer properly cleanup the parameters set to a material when the post shadow pass in done

jme3-core/src/main/java/com/jme3/shadow/AbstractShadowRenderer.java

@@ -484,14 +484,42 @@ public abstract class AbstractShadowRenderer implements SceneProcessor, Savable
             renderManager.setForcedTechnique(null);
             renderManager.setForcedMaterial(null);
             renderManager.setCamera(cam, false);
-
+            
+            //clearing the params in case there are some other shadow renderers
+            clearMatParams();
         }
 
     }
+    
+    /**
+     * This method is called once per frame and is responsible for clearing any
+     * material parameters that subclasses may need to clear on the post material.
+     *
+     * @param material the material that was used for the post shadow pass     
+     */
+    protected abstract void clearMaterialParameters(Material material);    
+    
+    private void clearMatParams(){
+        for (Material mat : matCache) {
+         
+            //clearing only necessary params, the others may be set by other 
+            //renderers 
+            //Note that j start at 1 because other shadow renderers will have 
+            //at least 1 shadow map and will set it on each frame anyway.
+            for (int j = 1; j < nbShadowMaps; j++) {
+                mat.clearParam(lightViewStringCache[j]);
+            }
+            for (int j = 1; j < nbShadowMaps; j++) {
+                mat.clearParam(shadowMapStringCache[j]);
+            }
+            clearMaterialParameters(mat);
+        }        
+        //No need to clear the postShadowMat params as the instance is locale to each renderer       
+    }
 
     /**
      * This method is called once per frame and is responsible for setting any
-     * material parameters than subclass may need to set on the post material.
+     * material parameters that subclasses may need to set on the post material.
      *
      * @param material the material to use for the post shadow pass
      */
@@ -553,7 +581,7 @@ public abstract class AbstractShadowRenderer implements SceneProcessor, Savable
             postshadowMat.setTexture(shadowMapStringCache[j], shadowMaps[j]);
         }
     }
-
+    
     public void preFrame(float tpf) {
     }
 

jme3-core/src/main/java/com/jme3/shadow/DirectionalLightShadowRenderer.java

@@ -202,6 +202,11 @@ public class DirectionalLightShadowRenderer extends AbstractShadowRenderer {
         material.setColor("Splits", splits);
     }
 
+    @Override
+    protected void clearMaterialParameters(Material material) {
+        material.clearParam("Splits");
+    }
+
     /**
      * returns the labda parameter see #setLambda(float lambda)
      *

jme3-core/src/main/java/com/jme3/shadow/PointLightShadowRenderer.java

@@ -160,6 +160,11 @@ public class PointLightShadowRenderer extends AbstractShadowRenderer {
         material.setVector3("LightPos", light.getPosition());
     }
 
+    @Override
+    protected void clearMaterialParameters(Material material) {
+        material.clearParam("LightPos");        
+    }
+    
     /**
      * gets the point light used to cast shadows with this processor
      *

jme3-core/src/main/java/com/jme3/shadow/SpotLightShadowRenderer.java

@@ -168,6 +168,12 @@ public class SpotLightShadowRenderer extends AbstractShadowRenderer {
          material.setVector3("LightDir", light.getDirection());
     }
 
+    @Override
+    protected void clearMaterialParameters(Material material) {
+        material.clearParam("LightPos");
+        material.clearParam("LightDir");
+    }
+    
     /**
      * How far the shadows are rendered in the view
      *

jme3-examples/src/main/java/jme3test/light/TestPointDirectionalAndSpotLightShadows.java

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2009-2012 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package jme3test.light;
+
+import com.jme3.app.SimpleApplication;
+import com.jme3.light.DirectionalLight;
+import com.jme3.light.PointLight;
+import com.jme3.light.SpotLight;
+import com.jme3.math.ColorRGBA;
+import com.jme3.math.FastMath;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.post.FilterPostProcessor;
+import com.jme3.renderer.queue.RenderQueue;
+import com.jme3.scene.Geometry;
+import com.jme3.scene.Node;
+import com.jme3.scene.shape.Box;
+import com.jme3.scene.shape.Sphere;
+import com.jme3.shadow.DirectionalLightShadowFilter;
+import com.jme3.shadow.DirectionalLightShadowRenderer;
+import com.jme3.shadow.EdgeFilteringMode;
+import com.jme3.shadow.PointLightShadowFilter;
+import com.jme3.shadow.PointLightShadowRenderer;
+import com.jme3.shadow.SpotLightShadowFilter;
+import com.jme3.shadow.SpotLightShadowRenderer;
+
+public class TestPointDirectionalAndSpotLightShadows extends SimpleApplication {
+    public static final int SHADOWMAP_SIZE = 512;
+
+    public static void main(String[] args) {
+        TestPointDirectionalAndSpotLightShadows app = new TestPointDirectionalAndSpotLightShadows();
+        app.start();
+    }
+    Node lightNode;
+    PointLightShadowRenderer plsr;
+    PointLightShadowFilter plsf;
+    DirectionalLightShadowRenderer dlsr;
+    DirectionalLightShadowFilter dlsf;
+    SpotLightShadowRenderer slsr;
+    SpotLightShadowFilter slsf;
+    SpotLight spotLight;
+    
+    boolean useFilter = false;
+    
+    @Override
+    public void simpleInitApp() {
+        flyCam.setMoveSpeed(10);
+        cam.setLocation(new Vector3f(0.040581334f, 1.7745866f, 6.155161f));
+        cam.setRotation(new Quaternion(4.3868728E-5f, 0.9999293f, -0.011230096f, 0.0039059948f));
+
+
+        Node scene = (Node) assetManager.loadModel("Models/Test/CornellBox.j3o");
+        scene.setShadowMode(RenderQueue.ShadowMode.CastAndReceive);
+        rootNode.attachChild(scene);
+        rootNode.getChild("Cube").setShadowMode(RenderQueue.ShadowMode.Receive);
+        lightNode = (Node) rootNode.getChild("Lamp");
+        Geometry lightMdl = new Geometry("Light", new Sphere(10, 10, 0.1f));
+        //Geometry  lightMdl = new Geometry("Light", new Box(.1f,.1f,.1f));
+        lightMdl.setMaterial(assetManager.loadMaterial("Common/Materials/RedColor.j3m"));
+        lightMdl.setShadowMode(RenderQueue.ShadowMode.Off);
+        lightNode.attachChild(lightMdl);
+        //lightMdl.setLocalTranslation(lightNode.getLocalTranslation());
+
+
+        Geometry box = new Geometry("box", new Box(0.2f, 0.2f, 0.2f));
+        //Geometry  lightMdl = new Geometry("Light", new Box(.1f,.1f,.1f));
+        box.setMaterial(assetManager.loadMaterial("Common/Materials/RedColor.j3m"));
+        box.setShadowMode(RenderQueue.ShadowMode.CastAndReceive);
+        rootNode.attachChild(box);
+        box.setLocalTranslation(-1f, 0.5f, -2);
+
+        ((PointLight) scene.getLocalLightList().get(0)).setColor(ColorRGBA.Red);
+        
+        plsr = new PointLightShadowRenderer(assetManager, SHADOWMAP_SIZE);
+        plsr.setLight((PointLight) scene.getLocalLightList().get(0));
+        plsr.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+
+
+
+        plsf = new PointLightShadowFilter(assetManager, SHADOWMAP_SIZE);
+        plsf.setLight((PointLight) scene.getLocalLightList().get(0));     
+        plsf.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+        plsf.setEnabled(useFilter);
+
+        //DIRECTIONAL LIGHT
+        DirectionalLight directionalLight = new DirectionalLight();
+        rootNode.addLight(directionalLight);
+        directionalLight.setColor(ColorRGBA.Blue);
+        directionalLight.setDirection(new Vector3f(-1f, -.2f, 0f));
+        dlsr = new DirectionalLightShadowRenderer(assetManager, SHADOWMAP_SIZE*2, 4);
+        dlsr.setLight(directionalLight);
+        dlsr.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+        
+        dlsf = new DirectionalLightShadowFilter(assetManager, SHADOWMAP_SIZE*2, 4);
+        dlsf.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+        dlsf.setLight(directionalLight);        
+        dlsf.setEnabled(useFilter);
+        
+        //SPOT LIGHT
+        spotLight = new SpotLight();
+        spotLight.setDirection(new Vector3f(1f,-1f,0f));
+        spotLight.setPosition(new Vector3f(-1f,3f,0f));
+        spotLight.setSpotOuterAngle(0.5f);
+        spotLight.setColor(ColorRGBA.Green);
+        Sphere sphere = new Sphere(8, 8, .1f);
+        Geometry sphereGeometry = new Geometry("Sphere", sphere);
+        sphereGeometry.setLocalTranslation(-1f, 3f, 0f);
+        sphereGeometry.setMaterial(assetManager.loadMaterial("Common/Materials/WhiteColor.j3m"));
+        rootNode.attachChild(sphereGeometry);
+        rootNode.addLight(spotLight);
+        
+        slsr = new SpotLightShadowRenderer(assetManager, SHADOWMAP_SIZE);
+        slsr.setLight(spotLight);
+        slsr.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+        
+        slsf = new SpotLightShadowFilter(assetManager, SHADOWMAP_SIZE);
+        slsf.setLight(spotLight);
+        slsf.setEdgeFilteringMode(EdgeFilteringMode.PCF4);
+        slsf.setEnabled(useFilter);
+        
+        
+        
+        slsr.setFlushQueues(false);
+        plsr.setFlushQueues(false);
+        dlsr.setFlushQueues(true);
+        slsf.setFlushQueues(false);
+        plsf.setFlushQueues(false);
+        dlsf.setFlushQueues(true);
+        if (!useFilter)viewPort.addProcessor(slsr);
+        if (!useFilter)viewPort.addProcessor(plsr);
+        if (!useFilter)viewPort.addProcessor(dlsr);
+        
+        FilterPostProcessor fpp = new FilterPostProcessor(assetManager);
+        fpp.addFilter(plsf);
+        fpp.addFilter(dlsf);
+        fpp.addFilter(slsf);
+        viewPort.addProcessor(fpp);
+              
+        ShadowTestUIManager uiMan = new ShadowTestUIManager(assetManager, plsr, plsf, guiNode, inputManager, viewPort);
+        ShadowTestUIManager uiManPls = new ShadowTestUIManager(assetManager, plsr, plsf, guiNode, inputManager, viewPort);
+        ShadowTestUIManager uiManDls = new ShadowTestUIManager(assetManager, dlsr, dlsf, guiNode, inputManager, viewPort);
+        ShadowTestUIManager uiManSls = new ShadowTestUIManager(assetManager, slsr, slsf, guiNode, inputManager, viewPort);
+  
+    }
+
+    float timeElapsed = 0.0f;
+    @Override
+    public void simpleUpdate(float tpf) {
+        timeElapsed += tpf;
+       lightNode.setLocalTranslation(FastMath.cos(timeElapsed), lightNode.getLocalTranslation().y, FastMath.sin(timeElapsed));
+       spotLight.setDirection(new Vector3f(FastMath.cos(-timeElapsed*.7f), -1.0f, FastMath.sin(-timeElapsed*.7f)));
+    }
+}