//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));
//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));