public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create the TransformGroup node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at run time. Add it to
// the root of the subgraph.
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
// Create a simple Shape3D node; add it to the scene graph.
objTrans.addChild(new ColorCube(0.4));
// Create a new Behavior object that will perform the
// desired operation on the specified transform and add
// it into the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(-1, 4000);
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objTrans, yAxis, 0.0f, (float) Math.PI * 1.0f);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
rotator.setSchedulingBounds(bounds);
objRoot.addChild(rotator);
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
// Directional light rotating around the scene and some ambient light.
public void addLight(SimpleUniverse su) {
BranchGroup bgLight = new BranchGroup();
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), Double.MAX_VALUE);
// Directional light (to be rotated).
Color3f lightColour = new Color3f(1.0f, 1.0f, 1.0f);
Vector3f lightDir = new Vector3f(0.0f, 0.0f, -1.0f);
DirectionalLight light = new DirectionalLight(lightColour, lightDir);
light.setInfluencingBounds(bounds);
// The transformation group for the directional light and its rotation.
TransformGroup tfmLight = new TransformGroup();
tfmLight.addChild(light);
// The Alpha for the rotation.
Alpha alphaLight = new Alpha(-1, 4000);
// The rotation
RotationInterpolator rot =
new RotationInterpolator(
alphaLight, tfmLight, new Transform3D(), 0.0f, (float) Math.PI * 2);
rot.setSchedulingBounds(bounds);
tfmLight.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
tfmLight.addChild(rot);
bgLight.addChild(tfmLight);
// Ambient light.
Color3f ambientLightColour = new Color3f(0.5f, 0.5f, 0.5f);
AmbientLight ambLight = new AmbientLight(ambientLightColour);
ambLight.setInfluencingBounds(bounds);
bgLight.addChild(ambLight);
su.addBranchGraph(bgLight);
}
/**
* principal method used to configure the java3D model of the sky.
*
* @return a BranchGroup with the model contents.
*/
protected BranchGroup createSceneGraph() {
// ##### Transform Groups ################
// Create the transform group node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so tha
// our behavior code can modify it at runtime.
objTrans = new TransformGroup();
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objTrans.setCapability(TransformGroup.ALLOW_CHILDREN_READ);
objTrans.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
objTrans.setCapability(TransformGroup.ALLOW_CHILDREN_EXTEND);
// #### Grid ########################################
if (this.showGrid) {
gridGroup = new BranchGroup();
gridGroup.setCapability(BranchGroup.ALLOW_DETACH);
Group3DSphere sphereRaster = new Group3DSphere(12, 24);
Appearance sphereRasterApp = new Appearance();
ColoringAttributes sphereRasterColor = new ColoringAttributes();
sphereRasterColor.setColor(0.0f, 0.41176f, 0.80f); // royal blue
sphereRasterApp.setColoringAttributes(sphereRasterColor);
sphereRaster.setAppearance(sphereRasterApp);
gridGroup = new BranchGroup();
gridGroup.addChild(sphereRaster);
objTrans.addChild(gridGroup);
}
// ##### Equator ########################
equatorGroup = new BranchGroup();
equatorGroup.setCapability(BranchGroup.ALLOW_DETACH);
Group3DCircle equator = new Group3DCircle(EQUATOR_RADIUS, EQUATOR_RES);
Appearance equatorApp = equator.getAppearance();
ColoringAttributes equatorColor = new ColoringAttributes();
equatorColor.setColor(new Color3f(java.awt.Color.YELLOW));
equatorApp.setColoringAttributes(equatorColor);
LineAttributes eqLine = new LineAttributes();
eqLine.setLineWidth(3.0f);
equatorApp.setLineAttributes(eqLine);
equator.setAppearance(equatorApp);
equatorGroup.addChild(equator);
objTrans.addChild(equatorGroup);
// ######################################
// ##### Axis ###########################
axisGroup = new Group3DAxis();
axisGroup.setCapability(BranchGroup.ALLOW_DETACH);
objTrans.addChild(axisGroup);
// ######################################
objScale = new TransformGroup();
objScale.addChild(objTrans);
// ##### root of the branch graph #######
BranchGroup objRoot = new BranchGroup();
objRoot.setCapability(BranchGroup.ALLOW_DETACH);
objRoot.addChild(objScale);
// ######################################
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), BOUNDINGSPHERE_RADIUS);
// ##### Background #####
Background bgNode = new Background(new Color3f(java.awt.Color.BLACK));
bgNode.setApplicationBounds(bounds);
objRoot.addChild(bgNode);
// ######################################
// ##### Lighting #######################
// Set up the ambient ligh
AmbientLight ambientLightNode = new AmbientLight();
ambientLightNode.setInfluencingBounds(bounds);
objRoot.addChild(ambientLightNode);
// ######################################
// ##### Behaviour ######################
// Create the rotate behavior node
// MouseRotateY behavior = new MouseRotateY();
MouseRotate behavior = new MouseRotate();
behavior.setTransformGroup(objTrans);
objTrans.addChild(behavior);
behavior.setSchedulingBounds(bounds);
// Create the zoom behavior node
zoom = new MouseZoom();
zoom.setTransformGroup(objTrans);
objTrans.addChild(zoom);
zoom.setSchedulingBounds(bounds);
// Create the translate behavior node
MouseTranslate behavior3 = new MouseTranslate();
behavior3.setTransformGroup(objTrans);
objTrans.addChild(behavior3);
behavior3.setSchedulingBounds(bounds);
// Auto rotator
Transform3D axis = new Transform3D();
axis.set(new AxisAngle4f(0, 0, 1, 2)); // theta,x,y,z.
Alpha mover = new Alpha(0, ALPHA_INC_DURATION); // loop count, period
rotator = new RotationInterpolator(mover, objTrans);
rotator.setTransformAxis(axis);
rotator.setSchedulingBounds(bounds);
objTrans.addChild(rotator);
return objRoot;
}
/**
* set up a timer object to drive animation.
*
* @param alpha specifies the timing parameters.
*/
public void setAlpha(Alpha alpha) {
rotator.setAlpha(alpha);
}
