//*** The platform on which the helicopter stands ***
//*** and its transformation group. ***
//An Appearance to make the platform red.
Appearance redApp = new Appearance();
setToMyDefaultAppearance(redApp,new Color3f(0.8f,0.0f,0.0f));
//Half edge length of the cube that represents the platform.
float platformSize = 0.1f;
//Generate the platform in the form of a cube.
Box platform = new Box(platformSize,platformSize,platformSize,redApp);
//A transformation rotating the platform a little bit.
Transform3D tfPlatform = new Transform3D();
tfPlatform.rotY(Math.PI/6);
//The transformation group of the platform.
TransformGroup tgPlatform = new TransformGroup(tfPlatform);
tgPlatform.addChild(platform);
//*** The cockpit of the helicopter. ****
//An Appearance to make the cockpit green.
Appearance greenApp = new Appearance();
setToMyDefaultAppearance(greenApp,new Color3f(0.0f,0.7f,0.0f));
//The following lines enforce that objects with the
//Appearance greenApp wil be displayed as wire frame models.
PolygonAttributes polygAttr = new PolygonAttributes();
polygAttr.setPolygonMode(PolygonAttributes.POLYGON_LINE);
greenApp.setPolygonAttributes(polygAttr);
//Radius of the cockpit.
float cabinRadius = 0.1f;
//Generate the cockpit in the form of a sphere.
Sphere cabin = new Sphere(cabinRadius,greenApp);
//The transformation group for the cockpit.
//The cockpit first remains in the origin. Later on, the whole
//helicopter is shifted onto the platform.
TransformGroup tgCabin = new TransformGroup();
tgCabin.addChild(cabin);
//*** The rotor blade of the helicopter. ***
//An Appearance to make the rotor blade blue.
Appearance blueApp = new Appearance();
setToMyDefaultAppearance(blueApp,new Color3f(0.0f,0.0f,1.0f));
//Generate the rotor blade in the form of a (very thin and long) box.
Box rotor = new Box(0.4f,0.0001f,0.01f,blueApp);
//A transformation placing the rotor blade on top of the cockpit.
Transform3D tfRotor = new Transform3D();
tfRotor.setTranslation(new Vector3f(0.0f,cabinRadius,0.0f));
//The transformation group for the rotor blade.
TransformGroup tgRotor = new TransformGroup(tfRotor);
tgRotor.addChild(rotor);
//*** The tail of the helicopter. ***
//Length of the tail.
float halfTailLength = 0.2f;
//Generate the tail in form of a green box.
Box tail = new Box(halfTailLength,0.02f,0.02f,greenApp);
//A transformation placing the tail at the end of the cockpit.
Transform3D tfTail = new Transform3D();
tfTail.setTranslation(new Vector3f(cabinRadius+halfTailLength,0.0f,0.0f));
//The transformation group for the tail.
TransformGroup tgTail = new TransformGroup(tfTail);
tgTail.addChild(tail);
//*** The helicopter, assembled by the transformation groups ***
//*** for the cockpit, the rotor blade and the tail. ***
//*** Afterwards, the helicopter must be lifted onto the ***
//*** platform. ***
//The transformation placing the helicopter on top of the platform.
Transform3D tfHelicopter = new Transform3D();
tfHelicopter.setTranslation(new Vector3f(0.0f,platformSize+cabinRadius,0.0f));
//The transformation group for the helicopter.
TransformGroup tgHelicopter = new TransformGroup(tfHelicopter);
tgHelicopter.addChild(tgCabin);
tgHelicopter.addChild(tgRotor);
tgHelicopter.addChild(tgTail);
//*** The helicopter and the platform are joint together in one ***
//*** transformation group in order to place them together ***
//*** in the scene. ***
//The transformation for positioning the helicopter
//together with the platform.
Transform3D tfHeliPlat = new Transform3D();
tfHeliPlat.setTranslation(new Vector3f(0.0f,0.1f,0.0f));
//The transformation group for the helicopter together with the platform.
TransformGroup tgHeliPlat = new TransformGroup(tfHeliPlat);
tgHeliPlat.addChild(tgHelicopter);
tgHeliPlat.addChild(tgPlatform);
//*** The tree trunk. ***
//An Appearance to make the tree trunk brown.
Appearance brownApp = new Appearance();
setToMyDefaultAppearance(brownApp,new Color3f(0.5f,0.2f,0.2f));
//Height of the tree trunk.
float trunkHeight = 0.4f;
//Generate the tree trunk as a cylinder.
Cylinder trunk = new Cylinder(0.05f,trunkHeight,brownApp);
//The transformation group of the tree trunk. The tree trunk first
//remains in the origin and is placed in the scene together with the
//leaves.
TransformGroup tgTrunk = new TransformGroup();
tgTrunk.addChild(trunk);
//*** The treetop. ***
//Height of the treetop.
float leavesHeight = 0.4f;
//Generate the treetop in the form of a green cone.
Cone leaves = new Cone(0.3f,leavesHeight,greenApp);
//A transformation to place the treetop on top of the tree trunk.
Transform3D tfLeaves = new Transform3D();
tfLeaves.setTranslation(new Vector3f(0.0f,(trunkHeight+leavesHeight)/2,0.0f));
//The transformation group of the treetop.
TransformGroup tgLeaves = new TransformGroup(tfLeaves);
tgLeaves.addChild(leaves);
//*** The tree assembled from the transformation groups for ***
//*** the tree trunk and the treetop. ***
//A transformation for positioning the tree in the scene.
Transform3D tfTree = new Transform3D();
tfTree.setTranslation(new Vector3f(-0.6f,0.0f,0.0f));
//The transformation group of the tree.
TransformGroup tgTree = new TransformGroup(tfTree);
tgTree.addChild(tgTrunk);
tgTree.addChild(tgLeaves);
//*** The root of the graph containing the scene. ***
BranchGroup theScene = new BranchGroup();
//Add the helicopter and the tree to the scene.
theScene.addChild(tgHeliPlat);
theScene.addChild(tgTree);
//The following four lines generate a white background.
Background bg = new Background(new Color3f(1.0f,1.0f,1.0f));
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0),Double.MAX_VALUE);
bg.setApplicationBounds(bounds);
theScene.addChild(bg);