Hi,

I'm using local3DToGlobal with PerspectiveProjection.  My problem is that when I don't use PerspectiveProjection local3DToGlobal works as expected. But when I use PerspectiveProjection local3DToGlobal appears to give a random Point that doesn't make sense to me.  However, if I have the local3DToGlobal in a function that's called with the Event.ENTER_FRAME it works as expected.

It's hard for me to explain, but I have code.

The red circle is suppose to follow the black circle end of the stick graphic. The red circle is using regular x and y positions, while the stick is using x, y and z (3D). If you call the onEnterFrameMethod directly the red circle wont wrap the circle end of the stick.  If you comment out the PerspectiveProjection code, then the red circle will wrap the circle end of the stick.  If you uncomment the PerspectiveProjection code, and then use an event listener to call the onEnterFrameMethod, the red circle will wrap the circle end of the stick.

Can anyone explain this?

Thanks!

package

{

import flash.display.Sprite;

import flash.events.Event;

import flash.geom.Point;

import flash.geom.Vector3D;

import flash.geom.PerspectiveProjection;

[SWF(width=800, height=800)]

public class LocalGlobal extends Sprite

{

private var _sprite:Sprite;

private var _tracker:Sprite;

private var _angle:Number = 0;

public function LocalGlobal()

{

var perspective:PerspectiveProjection = new PerspectiveProjection();

perspective.fieldOfView = 58;

var point:Point = new Point(400, 400);

perspective.projectionCenter = point;

transform.perspectiveProjection = perspective;

//

_sprite = new Sprite();

_sprite.graphics.lineStyle(10);

_sprite.graphics.lineTo(200, 0);

_sprite.graphics.drawCircle(200, 0, 10);

_sprite.x = 400;

_sprite.y = 400;

addChild(_sprite);

_tracker = new Sprite();

_tracker.graphics.lineStyle(2, 0xff0000);

_tracker.graphics.drawCircle(0, 0, 20);

addChild(_tracker);

//addEventListener(Event.ENTER_FRAME, onEnterFrameMethod);

onEnterFrameMethod();

}

private function onEnterFrameMethod(event:Event = null):void

{

_sprite.rotationX += 1;

_sprite.rotationY += 1.2;

_sprite.rotationZ += .5;

_sprite.x = 400 + Math.cos(_angle) * 100;

_sprite.y = 400 + Math.sin(_angle) * 100;

_sprite.z = 200 + Math.cos(_angle * .8) * 400;

_angle += .05;

var p:Point = _sprite.local3DToGlobal(new Vector3D(200, 0, 0));

_tracker.x = p.x;

_tracker.y = p.y;

}

}

}