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/*
* Copyright 1996-2008 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;
/**
* The DecalGroup node is an ordered group node used for defining decal
* geometry on top of other geometry. The DecalGroup node specifies that
* its children should be rendered in index order and that they generate
* coplanar objects. Examples of this include: painted decals or text on
* surfaces, a checkerboard layered on top of a table, etc.
* <p>
* The first child, at index 0, defines the surface on top of which all
* other children are rendered. The geometry of this child must encompass
* all other children, otherwise incorrect rendering may result. The
* polygons contained within each of the children must be facing the same
* way. If the polygons defined by the first child are front facing, then
* all other surfaces should be front facing. In this case, the polygons
* are rendered in order. The renderer can use knowledge of the coplanar
* nature of the surfaces to avoid
* Z-buffer collisions. If the main surface is back facing then all other
* surfaces should be back facing, and need not be rendered (even if back
* face culling is disabled).
* <p>
* Note that using the DecalGroup node does not guarantee that Z-buffer
* collisions are avoided. An implementation of Java 3D may fall back to
* treating DecalGroup node as an OrderedGroup node.
*/
public class DecalGroup extends OrderedGroup {
/**
* Constructs and initializes a new DecalGroup node object.
*/
public DecalGroup() {
}
/**
* Creates the retained mode DecalGroupRetained object that this
* DecalGroup component object will point to.
*/
@Override
void createRetained() {
this.retained = new DecalGroupRetained();
this.retained.setSource(this);
}
/**
* Used to create a new instance of the node. This routine is called
* by <code>cloneTree</code> to duplicate the current node.
* @param forceDuplicate when set to <code>true</code>, causes the
* <code>duplicateOnCloneTree</code> flag to be ignored. When
* <code>false</code>, the value of each node's
* <code>duplicateOnCloneTree</code> variable determines whether
* NodeComponent data is duplicated or copied.
*
* @see Node#cloneTree
* @see Node#cloneNode
* @see Node#duplicateNode
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
public Node cloneNode(boolean forceDuplicate) {
DecalGroup dg = new DecalGroup();
dg.duplicateNode(this, forceDuplicate);
return dg;
}
}
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