Initial creation of j3d-examples sources in CVS repository

1 files changed, 221 insertions, 0 deletions

diff --git a/src/TextureByReference/Tetrahedron.java b/src/TextureByReference/Tetrahedron.java
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+/*
+ * $RCSfile$
+ *
+ * Copyright (c) 2004 Sun Microsystems, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in
+ *   the documentation and/or other materials provided with the
+ *   distribution.
+ *
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 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 MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
+ * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
+ * USING, MODIFYING OR DISTRIBUTING THIS 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 THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ * You acknowledge that this software is not designed, licensed or
+ * intended for use in the design, construction, operation or
+ * maintenance of any nuclear facility.
+ *
+ * $Revision$
+ * $Date$
+ * $State$
+ */
+
+import javax.media.j3d.*;
+import javax.vecmath.*;
+
+
+public class Tetrahedron extends Shape3D {
+
+  private static final float sqrt3 = (float) Math.sqrt(3.0);
+  private static final float sqrt3_3 = sqrt3 / 3.0f;
+  private static final float sqrt24_3 = (float) Math.sqrt(24.0) / 3.0f;
+  
+  private static final float ycenter = 0.5f * sqrt24_3;
+  private static final float zcenter = -sqrt3_3;
+  
+  private static final Point3f p1 = new Point3f(-1.0f, -ycenter, -zcenter);
+  private static final Point3f p2 = new Point3f(1.0f, -ycenter, -zcenter);
+  private static final Point3f p3 = new Point3f(0.0f, -ycenter, -sqrt3 - zcenter);
+  private static final Point3f p4 = new Point3f(0.0f, sqrt24_3 - ycenter, 0.0f);
+  
+  private static final Point3f[] verts = {
+    p1, p2, p4,	// front face
+    p1, p4, p3,	// left, back face
+    p2, p3, p4,	// right, back face
+    p1, p3, p2,	// bottom face
+  };
+
+  private Point2f texCoord[] = {
+    new Point2f(-0.25f, 0.0f),
+    new Point2f(1.25f, 0.0f),
+    new Point2f(0.5f, 2.0f),
+  };
+
+  private TriangleArray geometryByRef;
+  private TriangleArray geometryByCopy;
+
+  // for geometry by reference
+  private Point3f[] verticesArray = new Point3f[12];
+  private TexCoord2f[] textureCoordsArray = new TexCoord2f[12];
+  private Vector3f[] normalsArray = new Vector3f[12];
+
+  // default to geometry by copy
+  public Tetrahedron() {
+    this(false);
+  }
+
+  // creates a tetrahedron with geometry by reference or by copy depending on
+  // the byRef parameter
+  public Tetrahedron(boolean byRef) {
+    if (byRef) {
+      createGeometryByRef();
+      this.setGeometry(geometryByRef);
+    }
+    else {
+      createGeometryByCopy();
+      this.setGeometry(geometryByCopy);
+    }
+    this.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
+    this.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);
+    setAppearance(new Appearance());
+  }
+
+  // create the geometry by reference and 
+  // store it in the geometryByRef variable
+  public void createGeometryByRef() {
+//     System.out.println("createGeometryByRef");
+    geometryByRef = new TriangleArray(12, TriangleArray.COORDINATES |
+				      TriangleArray.NORMALS |
+				      TriangleArray.TEXTURE_COORDINATE_2 |
+				      TriangleArray.BY_REFERENCE);
+
+    int i;
+
+    // the coordinates
+    for (i = 0; i < 12; i++) {
+      verticesArray[i] = new Point3f(verts[i]);
+    }
+    geometryByRef.setCoordRef3f(verticesArray);
+//     System.out.println("coordinates set");
+//     Point3f[] temp1 = geometryByRef.getCoordRef3f();
+//     for (i = 0; i < 12; i++) {
+//        System.out.println(temp1[i]);
+//     }
+
+    // the texture coordinates
+    for (i = 0; i < 12; i++) {
+      textureCoordsArray[i] = new TexCoord2f(texCoord[i%3]);
+    }
+    geometryByRef.setTexCoordRef2f(0, textureCoordsArray);
+//     System.out.println("texture coords set");
+//     TexCoord2f[] temp2 = geometryByRef.getTexCoordRef2f(0);
+//     for (i = 0; i < 12; i++) {
+//       System.out.println(temp2[i]);
+//     }
+
+    // the normals
+    Vector3f normal = new Vector3f();
+    Vector3f v1 = new Vector3f();
+    Vector3f v2 = new Vector3f();
+    Point3f[] pts = new Point3f[3];
+    for (int face = 0; face < 4; face++) {
+      pts[0] = new Point3f(verts[face*3]);
+      pts[1] = new Point3f(verts[face*3+1]);
+      pts[2] = new Point3f(verts[face*3+2]);
+      v1.sub(pts[1], pts[0]);
+      v2.sub(pts[2], pts[0]);
+      normal.cross(v1, v2);
+      normal.normalize();
+      for (i = 0; i < 3; i++) {
+	normalsArray[face*3+i] = new Vector3f(normal);
+      }
+    }
+    geometryByRef.setNormalRef3f(normalsArray);
+//     System.out.println("normals set");
+//     Vector3f[] temp3 = geometryByRef.getNormalRef3f();
+//     for (i = 0; i < 12; i++) {
+//       System.out.println(temp3[i]);
+//     }
+  }
+
+  // create the geometry by copy and store it in the geometryByCopy variable
+  public void createGeometryByCopy() {
+     int i;
+     geometryByCopy = new TriangleArray(12, TriangleArray.COORDINATES |
+ 				       TriangleArray.NORMALS | 
+ 				       TriangleArray.TEXTURE_COORDINATE_2);
+
+     geometryByCopy.setCoordinates(0, verts);
+
+     for (i = 0; i < 12; i++) {
+       geometryByCopy.setTextureCoordinate(0, i, 
+					   new TexCoord2f(texCoord[i%3]));
+     }
+     
+     int face;
+     Vector3f normal = new Vector3f();
+     Vector3f v1 = new Vector3f();
+     Vector3f v2 = new Vector3f();
+     Point3f [] pts = new Point3f[3];
+     for (i = 0; i < 3; i++) pts[i] = new Point3f();
+    
+     for (face = 0; face < 4; face++) {
+       geometryByCopy.getCoordinates(face*3, pts);
+       v1.sub(pts[1], pts[0]);
+       v2.sub(pts[2], pts[0]);
+       normal.cross(v1, v2);
+       normal.normalize();
+       for (i = 0; i < 3; i++) {
+ 	geometryByCopy.setNormal((face * 3 + i), normal);
+       }
+     }
+   }
+
+  // set the geometry to geometryByRef or geometryByCopy depending on the
+  // parameter.  Create geometryByRef or geometryByCopy if necessary  
+  public void setByReference(boolean b) {
+//     System.out.println("Tetrahedron.setByReference " + b);
+    // by reference is true
+    if (b) {
+      // if there is no geometryByRef, create it
+      if (geometryByRef == null) {
+	createGeometryByRef();
+      }
+      // set the geometry
+      this.setGeometry(geometryByRef);
+    }
+    // by reference is false 
+    else {
+      // if there is no geometryByCopy, create it
+      if (geometryByCopy == null) {
+	createGeometryByCopy();
+      }
+      // set the geometry
+      this.setGeometry(geometryByCopy);
+    }      
+  }
+}
+    
+