package { import caurina.transitions.Tweener; import flash.display.Sprite; import flash.events.Event; import sandy.core.Scene3D; import sandy.core.scenegraph.Camera3D; import sandy.core.scenegraph.Group; import sandy.core.scenegraph.Shape3D; import sandy.primitive.GeodesicSphere; import sandy.primitive.Sphere; [SWF(width=465, height=465, frameRate=30, backgroundColor=0xFFFFFF)] /** * Bounding ellipse of sphere in 2D - what's wrong? * @author makc */ public class CircleTest extends Sprite { private var container:Sprite; private var scene:Scene3D; private var sphere:Shape3D; private var R:Number = 100; public function CircleTest () { container = Sprite (addChild (new Sprite)); scene = new Scene3D ("scene", container, new Camera3D (2000, 465), new Group ("root")); sphere = new GeodesicSphere ("sphere", R, 3); // new Sphere ("sphere", R); sphere.z = 400; scene.root.addChild (sphere); toLeft (); addEventListener (Event.ENTER_FRAME, onEnterFrame); } private function toLeft ():void { Tweener.addTween (sphere, { x: -1500, time: 4, transition:"linear", onComplete:toRight }); } private function toRight ():void { Tweener.addTween (sphere, { x: +1500, time: 4, transition:"linear", onComplete:toLeft }); } private function onEnterFrame (e:Event):void { // sphere camera coords var sz:Number = (sphere.z - scene.camera.z); var sx:Number = sphere.x; // screen coords var sx_screen:Number = sx * scene.camera.focalLength / sz; var R_screen:Number = R * scene.camera.focalLength / sz; // distance to sphere var sd:Number = Math.sqrt (sx*sx + sz*sz); // angles var a:Number = Math.asin (R / sd); var b:Number = Math.asin (sx / sd); // apsides var dm:Number = R_screen / Math.cos (b - a); var dp:Number = R_screen / Math.cos (b + a); // semiaxes var A:Number = 0.5 * (dm + dp); var B:Number = sd * Math.tan (a) * scene.camera.focalLength / sz; // show stuff scene.render (); x = 462/2 -1000 -sx_screen; container.graphics.clear (); container.graphics.beginFill (0xFF00); container.graphics.drawRect (1000 +sx_screen -4, 465/2 -4, 8, 8); container.graphics.endFill (); container.graphics.lineStyle (1, 0xFF0000); container.graphics.moveTo (1000 +sx_screen -dm, 465/2 -40); container.graphics.lineTo (1000 +sx_screen -dm, 465/2 +40); container.graphics.moveTo (1000 +sx_screen +dp, 465/2 -40); container.graphics.lineTo (1000 +sx_screen +dp, 465/2 +40); container.graphics.drawEllipse (1000 +sx_screen -dm, 465/2 - B, 2*A, 2*B); // randomize sphere.rotateX += Math.random (); sphere.rotateY += Math.random (); sphere.rotateZ += Math.random (); } } }