Feature: added support for fog loading from blender file.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/branches/gradle-restructure@11035 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

jme3-blender/src/main/java/com/jme3/asset/BlenderKey.java

@@ -52,6 +52,7 @@ import com.jme3.export.OutputCapsule;
 import com.jme3.material.Material;
 import com.jme3.material.RenderState.FaceCullMode;
 import com.jme3.math.ColorRGBA;
+import com.jme3.post.Filter;
 import com.jme3.scene.CameraNode;
 import com.jme3.scene.LightNode;
 import com.jme3.scene.Node;
@@ -796,6 +797,8 @@ public class BlenderKey extends ModelKey {
         private List<LightNode>  lights;
         /** Loaded sky. */
         private Spatial          sky;
+        /** Scene filters (ie. FOG). */
+        private List<Filter>     filters;
         /**
          * The background color of the render loaded from the horizon color of the world. If no world is used than the gray color
          * is set to default (as in blender editor.
@@ -917,6 +920,21 @@ public class BlenderKey extends ModelKey {
             this.sky = sky;
         }
 
+        /**
+         * This method adds a scene filter. Filters are used to load FOG or other
+         * scene effects that blender can define.
+         * @param filter
+         *            the filter to be added
+         */
+        public void addFilter(Filter filter) {
+            if (filter != null) {
+                if (filters == null) {
+                    filters = new ArrayList<Filter>(5);
+                }
+                filters.add(filter);
+            }
+        }
+
         /**
          * @param backgroundColor
          *            the background color
@@ -981,6 +999,13 @@ public class BlenderKey extends ModelKey {
             return sky;
         }
 
+        /**
+         * @return scene filters
+         */
+        public List<Filter> getFilters() {
+            return filters;
+        }
+
         /**
          * @return the background color
          */
@@ -988,6 +1013,7 @@ public class BlenderKey extends ModelKey {
             return backgroundColor;
         }
 
+        @Override
         public int collideWith(Collidable other, CollisionResults results) throws UnsupportedCollisionException {
             return 0;
         }

jme3-blender/src/main/java/com/jme3/scene/plugins/blender/BlenderLoader.java

@@ -78,6 +78,7 @@ public class BlenderLoader implements AssetLoader {
     /** The blender context. */
     protected BlenderContext        blenderContext;
 
+    @Override
     public Spatial load(AssetInfo assetInfo) throws IOException {
         try {
             this.setup(assetInfo);
@@ -130,6 +131,7 @@ public class BlenderLoader implements AssetLoader {
                                     loadingResults.addLight(new LightNode(null, ambientLight));
                                 }
                                 loadingResults.setSky(landscapeHelper.toSky(worldStructure));
+                                loadingResults.addFilter(landscapeHelper.toFog(worldStructure));
                                 loadingResults.setBackgroundColor(landscapeHelper.toBackgroundColor(worldStructure));
                             }
                         }

jme3-blender/src/main/java/com/jme3/scene/plugins/blender/landscape/LandscapeHelper.java

@@ -8,6 +8,7 @@ import java.util.logging.Logger;
 import com.jme3.light.AmbientLight;
 import com.jme3.light.Light;
 import com.jme3.math.ColorRGBA;
+import com.jme3.post.filters.FogFilter;
 import com.jme3.scene.Spatial;
 import com.jme3.scene.plugins.blender.AbstractBlenderHelper;
 import com.jme3.scene.plugins.blender.BlenderContext;
@@ -37,6 +38,8 @@ public class LandscapeHelper extends AbstractBlenderHelper {
     private static final int    SKYTYPE_REAL  = 2;
     private static final int    SKYTYPE_PAPER = 4;
 
+    private static final int    MODE_MIST     = 0x01;
+
     public LandscapeHelper(String blenderVersion, BlenderContext blenderContext) {
         super(blenderVersion, blenderContext);
     }
@@ -53,7 +56,7 @@ public class LandscapeHelper extends AbstractBlenderHelper {
         float ambr = ((Number) worldStructure.getFieldValue("ambr")).floatValue();
         float ambg = ((Number) worldStructure.getFieldValue("ambg")).floatValue();
         float ambb = ((Number) worldStructure.getFieldValue("ambb")).floatValue();
-        if(ambr > 0 || ambg > 0 || ambb > 0) {
+        if (ambr > 0 || ambg > 0 || ambb > 0) {
             ambientLight = new AmbientLight();
             ColorRGBA ambientLightColor = new ColorRGBA(ambr, ambg, ambb, 0.0f);
             ambientLight.setColor(ambientLightColor);
@@ -64,6 +67,25 @@ public class LandscapeHelper extends AbstractBlenderHelper {
         return ambientLight;
     }
 
+    /**
+     * The method loads fog for the scene.
+     * NOTICE! Remember to manually set the distance and density of the fog.
+     * Unfortunately blender's fog parameters in no way fit to the JME.
+     * @param worldStructure
+     *            the world's structure
+     * @return fog filter or null if scene does not define it
+     */
+    public FogFilter toFog(Structure worldStructure) {
+        FogFilter result = null;
+        int mode = ((Number) worldStructure.getFieldValue("mode")).intValue();
+        if ((mode & MODE_MIST) != 0) {
+            LOGGER.fine("Loading fog.");
+            result = new FogFilter();
+            result.setFogColor(this.toBackgroundColor(worldStructure));
+        }
+        return result;
+    }
+
     /**
      * Loads the background color.
      * @param worldStructure