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package {
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import flash.display.StageQuality;
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import org.papervision3d.core.geom.renderables.Vertex3D;
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import org.papervision3d.lights.PointLight3D;
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import org.papervision3d.materials.shadematerials.FlatShadeMaterial;
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import org.papervision3d.materials.shadematerials.PhongMaterial;
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import org.papervision3d.objects.DisplayObject3D;
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import org.papervision3d.objects.primitives.Plane;
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import org.papervision3d.objects.primitives.Sphere;
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public class Main extends PaperBase {
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public var light:PointLight3D = new PointLight3D(true);
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public var physBox:DisplayObject3D = new DisplayObject3D(); //We'll keep all of the physical objects in here..
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public var sidemat:FlatShadeMaterial = new FlatShadeMaterial(light, 0xBBBBBB, 0x000000);
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public var floor:Plane = new Plane(sidemat, 1100, 1100, 10, 10);
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public function Main() {
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stage.quality = StageQuality.LOW; //Set the stage quality to low (for speed)
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init();
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}
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override protected function init3d():void {
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//Position the floor
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floor.y = -100;
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floor.pitch(90);
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default_scene.addChild(floor);
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//Position the camera
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default_camera.y = 300;
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default_camera.z = 1500;
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default_camera.lookAt(floor);
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//Position the light
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light.x = 0;
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light.y = 300;
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light.z = 500;
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//Create 10 Spheres, and put them in our Physics Box (Anything you add to physbox will be simulated, only spheres look right)
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for (var x:Number = 0; x <10; x++) {
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var sph:Sphere = new Sphere(new PhongMaterial(light, 0xBBBBBB, Math.round(Math.random() * 10000), 20), 100, 10, 8);
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sph.x = (Math.random() * 40) - 20; // Position it slightly randomly
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sph.z = (Math.random() * 40) - 20;
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sph.y = (300 * x); // Put it 300 px above the previous one
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sph.PreviousPosition = new Vertex3D(sph.x, sph.y, sph.z); // This stops the verlet from going crazy
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physBox.addChild(sph); // Add it to the physbox
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}
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default_scene.addChild(physBox); // Add the physbox to the scene
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}
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override protected function processFrame():void {
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default_camera.moveLeft(20); //This will rotate our camera around the scene,
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default_camera.lookAt(floor);//whilst keeping it looking at the middle.
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for (var item:String in physBox.children) { // This loop is run for every sphere in our physBox.
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var citem:DisplayObject3D = physBox.getChildByName(item); // Get the sphere.
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var lastposTmp:Vertex3D = getPos(citem); // Temporarily store it's position.
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// This line of code is known as "Verlet". Wikipedia it for more info.
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setPos(citem, vertexAdd(getPos(citem), vertexAdd(vertexSubtract(lastposTmp, citem.PreviousPosition), citem.Acceleration)));
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citem.PreviousPosition = lastposTmp; // Update the previous position..
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citem.Acceleration = new Vertex3D(0, -8.3, 0); // Apply Gravity
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constrain(citem); // This code checks if the sphere has collided with the environment.
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for (var item2:String in physBox.children) { //Check to see if it's hit any other spheres.
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if (item != item2) {
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var pitem:DisplayObject3D = physBox.getChildByName(item2);
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dohittest(pitem, citem); // Check
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}
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}
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}
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}
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private function dohittest(o1:DisplayObject3D, o2:DisplayObject3D):void {
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if (o1.hitTestObject(o2)) { // IF the two objects have collided, then
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var xmag:Number = (o1.x - o2.x)/2.1; // Get the distance
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var ymag:Number = (o1.y - o2.y)/2.1;
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var zmag:Number = (o1.z - o2.z)/2.1;
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// Move the objects away from eachother
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setPos(o1, vertexAdd(new Vertex3D(xmag, ymag, zmag), getPos(o1)));
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setPos(o2, vertexSubtract(getPos(o2),new Vertex3D(xmag, ymag, zmag)));
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}
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}
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private function constrain(obj:DisplayObject3D):void {
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if (obj.x <500 && obj.x> -500 && obj.z <500 && obj.z> -500){ // If the object is over the floor
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if (obj.y <0) { // If it's hit the floor
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// Move it out of the floor.
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if((obj.y - obj.PreviousPosition.y) <-10){
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obj.y = (obj.PreviousPosition.y * 1.2);
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if (obj.y <0) {
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obj.y = 0;
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}
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}else {
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obj.y = 0;
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}
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}
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}
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// If the object is way off the screen, put it back at the top.
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if (obj.y <-10000) {
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obj.y = 300 + (Math.random() * 5000);
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obj.x = (Math.random() * 20) - 40;
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obj.z = (Math.random() * 20) - 40;
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obj.PreviousPosition = new Vertex3D(obj.x, obj.y, obj.z);
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}
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}
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// --- These functions are used to do general addition and stuff ---
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private function vertexSubtract(v1:Vertex3D, v2:Vertex3D):Vertex3D {
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return new Vertex3D(v1.x - v2.x, v1.y - v2.y, v1.z - v2.z);
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}
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private function vertexAdd(v1:Vertex3D, v2:Vertex3D):Vertex3D {
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return new Vertex3D(v1.x + v2.x, v1.y + v2.y, v1.z + v2.z);
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}
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private function getPos(object:DisplayObject3D):Vertex3D {
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return new Vertex3D(object.x, object.y, object.z);
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}
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private function setPos(object:DisplayObject3D, point:Vertex3D):void {
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object.x = point.x;
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object.y = point.y;
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object.z = point.z;
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}
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// --- ---
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}
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}
