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diff --git a/src/javax/media/j3d/CachedTargets.java b/src/javax/media/j3d/CachedTargets.java
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+++ b/src/javax/media/j3d/CachedTargets.java
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+/*
+ * Copyright 2001-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package javax.media.j3d;
+
+class CachedTargets {
+    // cached targets, used by J3d threads
+
+    // 0 - Data type is GeometryAtom.
+    // 1 - Data type is Light, Fog, Background, ModelClip, AlternateAppearance,
+    //                  Clip
+    // 2 - Data type is BehaviorRetained.
+    // 3 - Data type is Sound or Soundscape
+    // 4 - Data type is ViewPlatformRetained.
+    // 5 - Data type is BoundingLeafRetained.
+    // 6 - Data type is GroupRetained.
+
+    // Order of index is as above.
+    // The handling of BoundingLeaf isn't optimize. Target threads should be
+    // more specific.
+
+    static String typeString[] = {
+	"GEO_TARGETS",
+	"ENV_TARGETS",
+	"BEH_TARGETS",
+	"SND_TARGETS",
+	"VPF_TARGETS",
+	"BLN_TARGETS",
+	"GRP_TARGETS",
+    };
+
+    static int updateTargetThreads[] = {
+	// GEO
+        J3dThread.UPDATE_TRANSFORM | J3dThread.UPDATE_RENDER |
+	J3dThread.UPDATE_GEOMETRY,
+
+	// ENV
+        J3dThread.UPDATE_RENDER | J3dThread.UPDATE_RENDERING_ENVIRONMENT,
+
+	// BEH
+        J3dThread.UPDATE_BEHAVIOR,
+
+	// SND
+        J3dThread.UPDATE_SOUND | J3dThread.SOUND_SCHEDULER,
+
+	// VPF
+        J3dThread.UPDATE_RENDER | J3dThread.UPDATE_BEHAVIOR |
+        J3dThread.UPDATE_SOUND | J3dThread.SOUND_SCHEDULER,
+
+	// BLN
+        J3dThread.UPDATE_RENDER | J3dThread.UPDATE_RENDERING_ENVIRONMENT |
+        J3dThread.UPDATE_BEHAVIOR | J3dThread.UPDATE_SOUND,
+
+	// GRP
+        J3dThread.UPDATE_TRANSFORM | J3dThread.UPDATE_GEOMETRY
+    };
+
+
+    NnuId targetArr[][] = new NnuId[Targets.MAX_NODELIST][];
+
+    int computeTargetThreads() {
+	int targetThreads = 0;
+
+	for (int i=0; i < Targets.MAX_NODELIST; i++) {
+	    if (targetArr[i] != null) {
+		targetThreads |= updateTargetThreads[i];
+            }
+        }
+	return targetThreads;
+    }
+
+    void copy( CachedTargets ct ) {
+
+        for(int i=0; i<Targets.MAX_NODELIST; i++) {
+            targetArr[i] = ct.targetArr[i];
+        }
+    }
+
+    void replace(NnuId oldObj, NnuId newObj, int type) {
+
+        NnuId[] newArr = new NnuId[targetArr[type].length];
+        System.arraycopy(targetArr[type], 0, newArr,
+                         0, targetArr[type].length);
+        targetArr[type] = newArr;
+		NnuIdManager.replace(oldObj, newObj, targetArr[type]);
+    }
+
+    void dump() {
+        for(int i=0; i<Targets.MAX_NODELIST; i++) {
+	    if (targetArr[i] != null) {
+		System.err.println("  " + typeString[i]);
+        	for(int j=0; j<targetArr[i].length; j++) {
+		    System.err.println("  " + targetArr[i][j]);
+	        }
+	    }
+        }
+    }
+
+}