BatchNode enhancements :

- batching after adding a new geometry only does an incremental batch instead of rebatching all geometries
- there is now a getOffsetIndex(geometry) method that returns the index of the first vertex of the geometry in the batch.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@9176 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/core/com/jme3/scene/BatchNode.java

@@ -80,6 +80,7 @@ public class BatchNode extends Node implements Savable {
     private float[] tmpFloatT;
     int maxVertCount = 0;
     boolean useTangents = false;
+    boolean needsFullRebatch = true;
 
     /**
      * Construct a batchNode
@@ -178,16 +179,25 @@ public class BatchNode extends Node implements Savable {
     }
 
     protected void doBatch() {
-        ///List<Geometry> tmpList = new ArrayList<Geometry>();
         Map<Material, List<Geometry>> matMap = new HashMap<Material, List<Geometry>>();
         maxVertCount = 0;
-        gatherGeomerties(matMap, this);
-        batches.clear();
         int nbGeoms = 0;
+
+        gatherGeomerties(matMap, this, needsFullRebatch);
+        if (needsFullRebatch) {
+            for (Batch batch : batches.values()) {
+                batch.geometry.removeFromParent();
+            }
+            batches.clear();
+        }
+        
         for (Material material : matMap.keySet()) {
             Mesh m = new Mesh();
             List<Geometry> list = matMap.get(material);
             nbGeoms += list.size();
+            if (!needsFullRebatch) {
+                list.add(batches.get(material).geometry);
+            }
             mergeGeometries(m, list);
             m.setDynamic();
             Batch batch = new Batch();
@@ -202,21 +212,25 @@ public class BatchNode extends Node implements Savable {
             batch.geometry.getMesh().updateBound();
             batches.put(material, batch);
         }
+
+        logger.log(Level.INFO, "Batched {0} geometries in {1} batches.", new Object[]{nbGeoms, batches.size()});
+
+
         //init temp float arrays
         tmpFloat = new float[maxVertCount * 3];
         tmpFloatN = new float[maxVertCount * 3];
         if (useTangents) {
             tmpFloatT = new float[maxVertCount * 4];
         }
-        logger.log(Level.INFO, "Batched {0} geometries in {1} batches.", new Object[]{nbGeoms, batches.size()});
     }
 
-    private void gatherGeomerties(Map<Material, List<Geometry>> map, Spatial n) {
+    private void gatherGeomerties(Map<Material, List<Geometry>> map, Spatial n, boolean rebatch) {
 
         if (n.getClass() == Geometry.class) {
 
             if (!isBatch(n) && n.getBatchHint() != BatchHint.Never) {
                 Geometry g = (Geometry) n;
+                if (!g.isBatched() || rebatch) {
                     if (g.getMaterial() == null) {
                         throw new IllegalStateException("No material is set for Geometry: " + g.getName() + " please set a material before batching");
                     }
@@ -225,15 +239,17 @@ public class BatchNode extends Node implements Savable {
                         list = new ArrayList<Geometry>();
                         map.put(g.getMaterial(), list);
                     }
+                    g.setTransformRefresh();
                     list.add(g);
                 }
+            }
 
         } else if (n instanceof Node) {
             for (Spatial child : ((Node) n).getChildren()) {
                 if (child instanceof BatchNode) {
                     continue;
                 }
-                gatherGeomerties(map, child);
+                gatherGeomerties(map, child, rebatch);
             }
         }
 
@@ -626,4 +642,12 @@ public class BatchNode extends Node implements Savable {
         Geometry geometry;
         boolean needMeshUpdate = false;
     }
+
+    protected void setNeedsFullRebatch(boolean needsFullRebatch) {
+        this.needsFullRebatch = needsFullRebatch;
+    }
+    
+    public int getOffsetIndex(Geometry batchedGeometry){
+        return batchedGeometry.startIndex;
+    }
 }

engine/src/core/com/jme3/scene/Geometry.java

@@ -322,8 +322,8 @@ public class Geometry extends Spatial {
         this.startIndex = 0;
         prevBatchTransforms = null;
         cachedOffsetMat = null;
-        //once the geometry is removed from the screnegraph we call batch on the batchNode before unreferencing it.
+        //once the geometry is removed from the screnegraph the batchNode needs to be rebatched.
-        this.batchNode.batch();
+        this.batchNode.setNeedsFullRebatch(true);
         this.batchNode = null;
         setCullHint(CullHint.Dynamic);
     }