Mike,
You can use multiple texture unit states to blend multiple
textures onto a shape. Included in the attachment is an
example of multi texturing in Java3D.
-Charmaine Lee
Java3D Engineering Team
> X-Originating-IP: [128.187.171.43]
> Mime-Version: 1.0
> X-OriginalArrivalTime: 14 Feb 2001 22:50:46.0351 (UTC)
FILETIME=[916FF5F0:01C096D8]
> Date: Wed, 14 Feb 2001 15:03:13 -0800
> From: Michael Smith <[EMAIL PROTECTED]>
> Subject: [JAVA3D] texture map blending
> To: [EMAIL PROTECTED]
>
> Java3D people,
> I'm doing research in image morphing and animation. I'd like to know
> how you would recommend handling the problem of blending two different
> textures onto a shape (triangulated grid) in Java3d. We'd like to do it
> taking advantage of java3d's hardware acceleration if we can.
> I've looked through the documentation on Java3D and couldn't find
> anything that I thought would work for this. The BLEND option in the
> TextureAppearance class only works with regaurd to the blend color.
> One thing we've done in the past was to paint the first texture map at
> a fraction of it's value (ex texture1.alpha = .2 ) and then paint the second
> texture map on top of that with a the rest of the value( texture2.alpha = .8
> ). I don't know how you would do this in java3d.
> I would be most grateful for any advice you would have.
>
> -Mike Smith.
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/*
* @(#)MultiTextureTest.java 1.8 01/01/11 07:40:34
*
* Copyright (c) 1996-2001 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import com.sun.j3d.utils.image.TextureLoader;
import com.sun.j3d.utils.geometry.Box;
import com.sun.j3d.utils.behaviors.vp.*;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.image.BufferedImage;
public class MultiTextureTest extends Applet implements ItemListener{
Choice choice;
TextureUnitState textureUnitState[] = new TextureUnitState[2];
Texture stoneTex;
Texture skyTex;
Texture lightTex;
private java.net.URL stoneImage = null;
private java.net.URL skyImage = null;
private SimpleUniverse u = null;
public Texture createLightMap(){
int width = 128;
int height = 128;
BufferedImage bimage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
int [] rgbArray = new int[width * height];
int index, index2;
int rgbInc = 256 / (width / 2 - 20);
int rgbValue = 0;
int k = width/2 - 5;
int i, j, rgb;
rgb = 0xff;
rgbValue = rgb | (rgb << 8) | (rgb << 16) | (rgb << 24);
for ( i = width / 2 - 1, j = 0; j < 10; j++, i--) {
rgbArray[i] = rgbValue;
}
for (; i > 8; i--, rgb -= rgbInc) {
rgbValue = rgb | (rgb << 8) | (rgb << 16) | (rgb << 24);
rgbArray[i] = rgbValue;
}
for (; i >= 0; i--) {
rgbArray[i] = rgbValue;
}
for (i = 0; i < width/2; i++) {
rgbValue = rgbArray[i];
index = i;
index2 = (width - i - 1);
for (j = 0; j < height; j++) {
rgbArray[index] = rgbArray[index2] = rgbValue;
index += width;
index2 += width;
}
}
bimage.setRGB(0, 0, width, height, rgbArray, 0, width);
ImageComponent2D grayImage = new ImageComponent2D(ImageComponent.FORMAT_RGB,
bimage);
lightTex = new Texture2D(Texture.BASE_LEVEL, Texture.RGB, width, height);
lightTex.setImage(0, grayImage);
return lightTex;
}
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create a Transformgroup to scale all objects so they
// appear in the scene.
TransformGroup objScale = new TransformGroup();
Transform3D t3d = new Transform3D();
t3d.setScale(0.4);
objScale.setTransform(t3d);
objRoot.addChild(objScale);
TransformGroup objTrans = new TransformGroup();
//write-enable for behaviors
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability( TransformGroup.ALLOW_TRANSFORM_READ );
objTrans.setCapability(TransformGroup.ENABLE_PICK_REPORTING);
objScale.addChild(objTrans);
Appearance ap = new Appearance();
// load textures
TextureAttributes texAttr1 = new TextureAttributes();
texAttr1.setTextureMode(TextureAttributes.DECAL);
TextureAttributes texAttr2 = new TextureAttributes();
texAttr2.setTextureMode(TextureAttributes.MODULATE);
TextureLoader tex = new TextureLoader(stoneImage, new String("RGB"), this);
if (tex == null)
return null;
stoneTex = tex.getTexture();
tex = new TextureLoader(skyImage, new String("RGB"), this);
if (tex == null)
return null;
skyTex = tex.getTexture();
lightTex = createLightMap();
textureUnitState[0] = new TextureUnitState(stoneTex, texAttr1, null);
textureUnitState[0].setCapability(TextureUnitState.ALLOW_STATE_WRITE);
textureUnitState[1] = new TextureUnitState(lightTex, texAttr2, null);
textureUnitState[1].setCapability(TextureUnitState.ALLOW_STATE_WRITE);
ap.setTextureUnitState(textureUnitState);
//Create a Box
Box BoxObj = new Box(1.5f, 1.5f, 0.8f, Box.GENERATE_NORMALS |
Box.GENERATE_TEXTURE_COORDS, ap, 2);
// add it to the scene graph.
objTrans.addChild(BoxObj);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
//Shine it with two lights.
Color3f lColor1 = new Color3f(0.7f, 0.7f, 0.7f);
Color3f lColor2 = new Color3f(0.2f, 0.2f, 0.1f);
Vector3f lDir1 = new Vector3f(-1.0f, -1.0f, -1.0f);
Vector3f lDir2 = new Vector3f(0.0f, 0.0f, -1.0f);
DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
DirectionalLight lgt2 = new DirectionalLight(lColor2, lDir2);
lgt1.setInfluencingBounds(bounds);
lgt2.setInfluencingBounds(bounds);
objScale.addChild(lgt1);
objScale.addChild(lgt2);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public MultiTextureTest (){
}
public MultiTextureTest(java.net.URL stoneURL, java.net.URL skyURL) {
stoneImage = stoneURL;
skyImage = skyURL;
}
public void init() {
if (stoneImage == null) {
// the path to the image for an applet
try {
stoneImage = new java.net.URL(getCodeBase().toString() +
"../images/stone.jpg");
}
catch (java.net.MalformedURLException ex) {
System.out.println(ex.getMessage());
System.exit(1);
}
}
if (skyImage == null) {
// the path to the image for an applet
try {
skyImage = new java.net.URL(getCodeBase().toString() +
"../images/bg.jpg");
}
catch (java.net.MalformedURLException ex) {
System.out.println(ex.getMessage());
System.exit(1);
}
}
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center", c);
// create the gui
choice = new Choice();
choice.addItem("stone + light");
choice.addItem("stone");
choice.addItem("lightMap");
choice.addItem("sky");
choice.addItem("stone + sky");
choice.addItemListener(this);
add("North", choice);
BranchGroup scene = createSceneGraph();
u = new SimpleUniverse(c);
ViewingPlatform viewingPlatform = u.getViewingPlatform();
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
viewingPlatform.setNominalViewingTransform();
// add orbit behavior but disable translate
OrbitBehavior orbit =
new OrbitBehavior(c, OrbitBehavior.DISABLE_TRANSLATE);
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
orbit.setSchedulingBounds(bounds);
viewingPlatform.setViewPlatformBehavior(orbit);
u.addBranchGraph(scene);
}
public void destroy() {
u.removeAllLocales();
}
public void itemStateChanged(ItemEvent e)
{
int index = choice.getSelectedIndex();
switch (index) {
case 0 : /* stone + light */
textureUnitState[0].setTexture(stoneTex);
textureUnitState[1].setTexture(lightTex);
break;
case 1 : /* stone */
textureUnitState[0].setTexture(stoneTex);
textureUnitState[1].setTexture(null);
break;
case 2 : /* light */
textureUnitState[0].setTexture(null);
textureUnitState[1].setTexture(lightTex);
break;
case 3 : /* sky */
textureUnitState[0].setTexture(null);
textureUnitState[1].setTexture(skyTex);
break;
case 4 : /* stone + sky */
textureUnitState[0].setTexture(stoneTex);
textureUnitState[1].setTexture(skyTex);
break;
default: /* both */
break;
}
}
public static void main(String argv[])
{
java.net.URL stoneURL = null;
java.net.URL skyURL = null;
// the path to the image for an application
try {
stoneURL = new java.net.URL("file:../images/stone.jpg");
skyURL = new java.net.URL("file:../images/bg.jpg");
}
catch (java.net.MalformedURLException ex) {
System.out.println(ex.getMessage());
System.exit(1);
}
new MainFrame(new MultiTextureTest(stoneURL, skyURL), 750, 750);
}
}
