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/*
* ShadowApp.java 1.0 99/04/12
*
* Copyright (c) 1999 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.
*/
/*
* This application demonstrates how a programmer can create shadows
* in Java 3D automatically.
*
* The class SimpleShadow produces shadow polygons for simple visual
* objects in certain situations.
*
* Note that no real time 3D graphics API provides automatic
* shadowing.
*
* This application (or a version of it) generated one or more
* of the images in Chapter 6 of Getting Started with the Java 3D API.
* The Java 3D Turtorial.
*
* See http://www.sun.com/desktop/java3d/collateral for more information.
*
*/
import java.applet.Applet;
import java.awt.BorderLayout;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Geometry;
import javax.media.j3d.GeometryArray;
import javax.media.j3d.Material;
import javax.media.j3d.QuadArray;
import javax.media.j3d.Shape3D;
import javax.vecmath.Color3f;
import javax.vecmath.Point3f;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.SimpleUniverse;
/**
* ShadowApp creates a single plane
*/
public class ShadowApp extends Applet {
public class LitQuad extends Shape3D {
LitQuad(Point3f A, Point3f B, Point3f C, Point3f D) {
this.setGeometry(createGeometry(A, B, C, D));
this.setAppearance(createAppearance());
}
Geometry createGeometry(Point3f A, Point3f B, Point3f C, Point3f D) {
QuadArray plane = new QuadArray(4, GeometryArray.COORDINATES
| GeometryArray.NORMALS);
plane.setCoordinate(0, A);
plane.setCoordinate(1, B);
plane.setCoordinate(2, C);
plane.setCoordinate(3, D);
Vector3f a = new Vector3f(A.x - B.x, A.y - B.y, A.z - B.z);
Vector3f b = new Vector3f(C.x - B.x, C.y - B.y, C.z - B.z);
Vector3f n = new Vector3f();
n.cross(b, a);
n.normalize();
plane.setNormal(0, n);
plane.setNormal(1, n);
plane.setNormal(2, n);
plane.setNormal(3, n);
return plane;
}
Appearance createAppearance() {
Appearance appear = new Appearance();
Material material = new Material();
appear.setMaterial(material);
return appear;
}
}
public class SimpleShadow extends Shape3D {
SimpleShadow(GeometryArray geom, Vector3f direction, Color3f col,
float height) {
int vCount = geom.getVertexCount();
QuadArray poly = new QuadArray(vCount, GeometryArray.COORDINATES
| GeometryArray.COLOR_3);
int v;
Point3f vertex = new Point3f();
Point3f shadow = new Point3f();
for (v = 0; v < vCount; v++) {
geom.getCoordinate(v, vertex);
shadow.set(vertex.x + (vertex.y - height) * direction.x,
height + 0.0001f, vertex.z + (vertex.y - height)
* direction.y);
poly.setCoordinate(v, shadow);
poly.setColor(v, col);
}
this.setGeometry(poly);
}
} // end of PolyFour class
public ShadowApp() {
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D(null);
add("Center", c);
BranchGroup scene = new BranchGroup();
Shape3D plane = new LitQuad(new Point3f(-0.3f, 0.6f, 0.2f),
new Point3f(-0.3f, -0.3f, 0.2f),
new Point3f(0.6f, -0.3f, -0.3f), new Point3f(0.6f, 0.6f, -0.3f));
scene.addChild(plane);
Shape3D floor = new LitQuad(new Point3f(-1.0f, -0.5f, -1.0f),
new Point3f(-1.0f, -0.5f, 1.0f),
new Point3f(1.0f, -0.5f, 1.0f), new Point3f(1.0f, -0.5f, -1.0f));
scene.addChild(floor);
AmbientLight lightA = new AmbientLight();
lightA.setInfluencingBounds(new BoundingSphere());
scene.addChild(lightA);
DirectionalLight lightD1 = new DirectionalLight();
lightD1.setInfluencingBounds(new BoundingSphere());
Vector3f direction = new Vector3f(-1.0f, -1.0f, -1.0f);
direction.normalize();
lightD1.setDirection(direction);
scene.addChild(lightD1);
Shape3D shadow = new SimpleShadow((GeometryArray) plane.getGeometry(),
direction, new Color3f(0.2f, 0.2f, 0.2f), -0.5f);
scene.addChild(shadow);
SimpleUniverse u = new SimpleUniverse(c);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
}
public static void main(String argv[]) {
new MainFrame(new ShadowApp(), 256, 256);
}
}
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