Away3D Forum Problem with lookAt function for Object3D in Away3D 4

luddet, Newbie
Posted: 24 October 2011 08:27 AM Total Posts: 4

I have a problem with lookAt not functioning properly since I updated to the release version of Flash11 and Away3D 4. Everything worked fine during the incubator build, and also during the Flash 11 beta build.

This is the case:
I have a mesh in an Object3d which is the player that is on a coordinate, lets say 0,0,0 that another mesh in an object3d (an opponent) should look at and follow.

The opponent object is in the same space as the player object and I have made sure that the opponent is getting the correct coordinates (0,0,0) from the player to look at.

The opponent is however looking at an completely different direction than the player is at. The opponent continues to look at that direction even if the coordinates are updated by moving the player. However, when the player is circling round the opponent, the opponent at some angle is turning to follow the player, but when the player reaches a certain angle position the opponents turns back to look at its initial distant point.

var opponentMesh:PrimitiveBase = ((opponent.skin as Away3D4Mesh).mesh as Cube).position;
 
opponentMesh.lookAt((player.skin.mesh as Cube).position); 

What is wrong?
To me it seems to be the Object3D.lookAt function not calculating the looking objects rotation correctly.
I have not changed anything in this behavior, that worked fine before I updated to the release flash player and the newer away version.

Thanks for your help, it is really appreciated!
/Ludwig

Jeff, Newbie
Posted: 26 October 2011 12:09 AM Total Posts: 30 [ # 1 ]

Hi,

I had the same issue than you, as a temporary fix copy & paste the lookAt code from previous release. In my case, it works fine.

luddet, Newbie
Posted: 26 October 2011 06:54 AM Total Posts: 4 [ # 2 ]

Thank you! I will try that.
It looks as it might be a problem with away combined with jiglib physics. I can get meshes without any physical connections to lookAt objects but physical meshes seem to break somehow.

Rob Bateman, Administrator
Posted: 06 November 2011 06:26 PM Total Posts: 120 [ # 3 ]

I’ve just submitted a fix to the lookAt problem on github. please try out the latest build to see if the issues you were experiencing have been fixed!

cheers

Rob

John Brookes, Moderator
Posted: 06 November 2011 07:04 PM Total Posts: 732 [ # 4 ]

I miss old lookAt )

Little example.

Idea is to have a child object (trident) lookAt some world position while keeping the X axis parallel to the ground.

This works in the old lookat (one that doenst use pointTo)
https://github.com/away3d/away3d-core-fp11/blob/3e1aff496f1df83c046139043e320a205414a102/src/away3d/core/base/Object3D.as

/*
 * This uses lookAt on a child that looks at a world position.
 * Childs X axis (big red arrow) always parallel with the ground
 */

package 
{
 import away3d.cameras.lenses.PerspectiveLens;
 import away3d.containers.ObjectContainer3D;
 import away3d.containers.Scene3D;
 import away3d.containers.View3D;
 import away3d.controllers.HoverController;
 import away3d.debug.AwayStats;
 import away3d.debug.Trident;
 import away3d.primitives.WireframeGrid;
 import flash.display.Sprite;
 import flash.display.StageAlign;
 import flash.display.StageScaleMode;
 import flash.events.Event;
 import flash.events.MouseEvent;
 import flash.geom.Matrix3D;
 import flash.geom.Vector3D;
 
 public class PointAtTest extends Sprite 
 {
  private var view:View3D;
  private var scene:Scene3D;
  //camera controls
  private var camController:HoverController;
  private var move:Boolean = false;
  private var lastPanAngle:Number;
  private var lastTiltAngle:Number;
  private var lastMouseX:Number;
  private var lastMouseY:Number;
  
  
  private var container:ObjectContainer3D;
  private var childObject:Trident;
  private var lookAtVector:Vector3D;
  
  public function PointAtTest():void 
  {
   if (stage) init();
   else addEventListener(Event.ADDED_TO_STAGE, init);
  }
  
  private function init(e:Event = null):void 
  {
   removeEventListener(Event.ADDED_TO_STAGE, init); 
   // entry point
   stage.scaleMode = StageScaleMode.NO_SCALE;
   stage.align = StageAlign.TOP_LEFT;
   
   
   int3D();
   initObjects();
   initListeners();
  }
  
  private function int3D():void 
  {
   view = new View3D();
   view.backgroundColor = 0x0
   addChild(view);
   
   scene = view.scene ;
   
   camController = new HoverController(view.camera, null, 0);
   camController.yFactor = 1;
   camController.steps = 32
   camController.minTiltAngle = -90
   camController.distance = 1500
  }
  
  private function initObjects():void 
  {
   var grid:WireframeGrid = new WireframeGrid(10, 1000, 2, 0x0,null,true);
   scene.addChild(grid);
   
   container = new ObjectContainer3D();
   container.rotationX = 20;
   container.x = -200;
   container.y = 200;
   container.z = -200;
   scene.addChild(container);
   
   //just for show
  // var containerTrident:Trident= new Trident(400);
  // container.addChild(containerTrident);
   
   
   childObject = new Trident(2000);
   childObject.y = 200
   container.addChild(childObject);
  
  }
  
  private function handleEnterFrame(e:Event):void 
  {
   if (move) {
    camController.panAngle = 0.3 * (stage.mouseX - lastMouseX) + lastPanAngle;
    camController.tiltAngle = 0.3 * (stage.mouseY - lastMouseY) + lastTiltAngle;
   }
   
   
   //some movement
   container.moveForward(1)
   container.rotationY +=0.5
   container.rotationX -=0.5
   
   lookAtVector = new Vector3D(-500, 0, -500);
   var m3:Matrix3D = container.transform.clone();
   m3.invert()
   lookAtVector = Matrix3D(m3).transformVector(lookAtVector.clone());
   var up:Vector3D = Matrix3D(m3).deltaTransformVector(new Vector3D(0,1,0));
   childObject.lookAt(lookAtVector, up); 
   
   view.render();
  }
  
  private function onMouseDown(event:MouseEvent):void
  {
   lastPanAngle = camController.panAngle;
   lastTiltAngle = camController.tiltAngle;
   lastMouseX = stage.mouseX;
   lastMouseY = stage.mouseY;
   move = true;
   stage.addEventListener(Event.MOUSE_LEAVE, onStageMouseLeave);
  }
  
  /**
   * Mouse up listener for navigation
   */
  private function onMouseUp(event:MouseEvent):void
  {
   move = false;
   stage.removeEventListener(Event.MOUSE_LEAVE, onStageMouseLeave);
  }
  
  private function onMouseWheel(event:MouseEvent):void
  {
   camController.distance -= event.delta * 10;
   trace(camController.distance)
  }
 
  
  /**
   * Mouse stage leave listener for navigation
   */
  private function onStageMouseLeave(event:Event):void
  {
   move = false;
   stage.removeEventListener(Event.MOUSE_LEAVE, onStageMouseLeave);
  }
  
  private function onStageResize(event : Event) : void
  {
   view.width = stage.stageWidth;
   view.height = stage.stageHeight;
  }
  
  private function initListeners():void 
  {
   addEventListener(Event.ENTER_FRAME, handleEnterFrame);
   stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
   stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
   stage.addEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel);
   stage.addEventListener(Event.RESIZE, onStageResize);
  }
 }
 
} 

John Brookes, Moderator
Posted: 07 November 2011 03:52 PM Total Posts: 732 [ # 5 ]

“original away3d lookat code has been reinstated”

Rob, lookAt still fails on the Z with that.

If I use this old version of lookAt
https://github.com/away3d/away3d-core-fp11/blob/3e1aff496f1df83c046139043e320a205414a102/src/away3d/core/base/Object3D.as

Only one (z=0 x=0) north pole fails. Which has always been the case.

The latest commit still fails on all z=0

just remembered I use the old hoverDragControl camera thing from the examples not included in rar

File Attachments

src.rar (File Size: 5KB - Downloads: 0)

Rob Bateman, Administrator
Posted: 08 November 2011 05:39 PM Total Posts: 120 [ # 6 ]

how about the “further fix to lookat code” commit?

John Brookes, Moderator
Posted: 08 November 2011 06:24 PM Total Posts: 732 [ # 7 ]

Yep that works

Wonders what the //ridiculous matrix error is

Rob Bateman, Administrator
Posted: 09 November 2011 01:16 AM Total Posts: 120 [ # 8 ]

JohnBrookes - 08 November 2011 06:24 PM
Wonders what the //ridiculous matrix error is

for more info on that, you can look here

https://bugbase.adobe.com/index.cfm?event=bug&id=3021531

ANDI, Newbie
Posted: 17 July 2013 12:37 PM Total Posts: 4 [ # 9 ]

In my example the same error occurs.

I thought about manually rotatting the camera with
camera.rotationX and camera.rotationY
But it does not work.

here is my code:

var cameraRotatorX:Number = stage.width / 2 - mouseX;
    var cameraRotatorY:Number  =  stage.height / 2 - mouseY;
    cameraRotatorY += 0.0+cameraRotatorY/100 ;
    cameraRotatorX += 0.0+cameraRotatorX/100 ;
    
   
    camera.y =   Math.sin(  cameraRotatorX  / 180 * Math.PI  ) * cameraDis;  
  
      camera.x = Math.sin(cameraRotatorY / 180 * Math.PI) * cameraDis;
    camera.z =    Math.cos(- cameraRotatorX / 180 * Math.PI) *   Math.cos(cameraRotatorY / 180 * Math.PI)   *     cameraDis; 
   // camera.lookAt(new Vector3D(  ) );
     camera.rotationX =180-cameraRotatorX;
     camera.rotationY = 180 +   cameraRotatorY; 

does someone know about using camera.rotationZ ?

Problem with lookAt function for Object3D in Away3D 4 Software: Away3D 4.x

luddet, Newbie Posted: 24 October 2011 08:27 AM Total Posts: 4 I have a problem with lookAt not functioning properly since I updated to the release version of Flash11 and Away3D 4. Everything worked fine during the incubator build, and also during the Flash 11 beta build. This is the case: I have a mesh in an Object3d which is the player that is on a coordinate, lets say 0,0,0 that another mesh in an object3d (an opponent) should look at and follow. The opponent object is in the same space as the player object and I have made sure that the opponent is getting the correct coordinates (0,0,0) from the player to look at. The opponent is however looking at an completely different direction than the player is at. The opponent continues to look at that direction even if the coordinates are updated by moving the player. However, when the player is circling round the opponent, the opponent at some angle is turning to follow the player, but when the player reaches a certain angle position the opponents turns back to look at its initial distant point. `var opponentMesh:PrimitiveBase = ((opponent.skin as Away3D4Mesh).mesh as Cube).position; opponentMesh.lookAt((player.skin.mesh as Cube).position);` What is wrong? To me it seems to be the Object3D.lookAt function not calculating the looking objects rotation correctly. I have not changed anything in this behavior, that worked fine before I updated to the release flash player and the newer away version. Thanks for your help, it is really appreciated! /Ludwig
Jeff, Newbie Posted: 26 October 2011 12:09 AM Total Posts: 30 [ # 1 ] Hi, I had the same issue than you, as a temporary fix copy & paste the lookAt code from previous release. In my case, it works fine.
luddet, Newbie Posted: 26 October 2011 06:54 AM Total Posts: 4 [ # 2 ] Thank you! I will try that. It looks as it might be a problem with away combined with jiglib physics. I can get meshes without any physical connections to lookAt objects but physical meshes seem to break somehow.
Rob Bateman, Administrator Posted: 06 November 2011 06:26 PM Total Posts: 120 [ # 3 ] I’ve just submitted a fix to the lookAt problem on github. please try out the latest build to see if the issues you were experiencing have been fixed! cheers Rob
John Brookes, Moderator Posted: 06 November 2011 07:04 PM Total Posts: 732 [ # 4 ] I miss old lookAt ) Little example. Idea is to have a child object (trident) lookAt some world position while keeping the X axis parallel to the ground. This works in the old lookat (one that doenst use pointTo) https://github.com/away3d/away3d-core-fp11/blob/3e1aff496f1df83c046139043e320a205414a102/src/away3d/core/base/Object3D.as /* * This uses lookAt on a child that looks at a world position. * Childs X axis (big red arrow) always parallel with the ground / package { import away3d.cameras.lenses.PerspectiveLens; import away3d.containers.ObjectContainer3D; import away3d.containers.Scene3D; import away3d.containers.View3D; import away3d.controllers.HoverController; import away3d.debug.AwayStats; import away3d.debug.Trident; import away3d.primitives.WireframeGrid; import flash.display.Sprite; import flash.display.StageAlign; import flash.display.StageScaleMode; import flash.events.Event; import flash.events.MouseEvent; import flash.geom.Matrix3D; import flash.geom.Vector3D; public class PointAtTest extends Sprite { private var view:View3D; private var scene:Scene3D; //camera controls private var camController:HoverController; private var move:Boolean = false; private var lastPanAngle:Number; private var lastTiltAngle:Number; private var lastMouseX:Number; private var lastMouseY:Number; private var container:ObjectContainer3D; private var childObject:Trident; private var lookAtVector:Vector3D; public function PointAtTest():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); // entry point stage.scaleMode = StageScaleMode.NO_SCALE; stage.align = StageAlign.TOP_LEFT; int3D(); initObjects(); initListeners(); } private function int3D():void { view = new View3D(); view.backgroundColor = 0x0 addChild(view); scene = view.scene ; camController = new HoverController(view.camera, null, 0); camController.yFactor = 1; camController.steps = 32 camController.minTiltAngle = -90 camController.distance = 1500 } private function initObjects():void { var grid:WireframeGrid = new WireframeGrid(10, 1000, 2, 0x0,null,true); scene.addChild(grid); container = new ObjectContainer3D(); container.rotationX = 20; container.x = -200; container.y = 200; container.z = -200; scene.addChild(container); //just for show // var containerTrident:Trident= new Trident(400); // container.addChild(containerTrident); childObject = new Trident(2000); childObject.y = 200 container.addChild(childObject); } private function handleEnterFrame(e:Event):void { if (move) { camController.panAngle = 0.3 (stage.mouseX - lastMouseX) + lastPanAngle; camController.tiltAngle = 0.3 * (stage.mouseY - lastMouseY) + lastTiltAngle; } //some movement container.moveForward(1) container.rotationY +=0.5 container.rotationX -=0.5 lookAtVector = new Vector3D(-500, 0, -500); var m3:Matrix3D = container.transform.clone(); m3.invert() lookAtVector = Matrix3D(m3).transformVector(lookAtVector.clone()); var up:Vector3D = Matrix3D(m3).deltaTransformVector(new Vector3D(0,1,0)); childObject.lookAt(lookAtVector, up); view.render(); } private function onMouseDown(event:MouseEvent):void { lastPanAngle = camController.panAngle; lastTiltAngle = camController.tiltAngle; lastMouseX = stage.mouseX; lastMouseY = stage.mouseY; move = true; stage.addEventListener(Event.MOUSE_LEAVE, onStageMouseLeave); } /** * Mouse up listener for navigation / private function onMouseUp(event:MouseEvent):void { move = false; stage.removeEventListener(Event.MOUSE_LEAVE, onStageMouseLeave); } private function onMouseWheel(event:MouseEvent):void { camController.distance -= event.delta 10; trace(camController.distance) } /** * Mouse stage leave listener for navigation */ private function onStageMouseLeave(event:Event):void { move = false; stage.removeEventListener(Event.MOUSE_LEAVE, onStageMouseLeave); } private function onStageResize(event : Event) : void { view.width = stage.stageWidth; view.height = stage.stageHeight; } private function initListeners():void { addEventListener(Event.ENTER_FRAME, handleEnterFrame); stage.addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown); stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUp); stage.addEventListener(MouseEvent.MOUSE_WHEEL, onMouseWheel); stage.addEventListener(Event.RESIZE, onStageResize); } } }
John Brookes, Moderator Posted: 07 November 2011 03:52 PM Total Posts: 732 [ # 5 ] “original away3d lookat code has been reinstated” Rob, lookAt still fails on the Z with that. If I use this old version of lookAt https://github.com/away3d/away3d-core-fp11/blob/3e1aff496f1df83c046139043e320a205414a102/src/away3d/core/base/Object3D.as Only one (z=0 x=0) north pole fails. Which has always been the case. The latest commit still fails on all z=0 just remembered I use the old hoverDragControl camera thing from the examples not included in rar File Attachments src.rar (File Size: 5KB - Downloads: 0)
Rob Bateman, Administrator Posted: 08 November 2011 05:39 PM Total Posts: 120 [ # 6 ] how about the “further fix to lookat code” commit?
John Brookes, Moderator Posted: 08 November 2011 06:24 PM Total Posts: 732 [ # 7 ] Yep that works Wonders what the //ridiculous matrix error is
Rob Bateman, Administrator Posted: 09 November 2011 01:16 AM Total Posts: 120 [ # 8 ] JohnBrookes - 08 November 2011 06:24 PM Wonders what the //ridiculous matrix error is for more info on that, you can look here https://bugbase.adobe.com/index.cfm?event=bug&id=3021531
ANDI, Newbie Posted: 17 July 2013 12:37 PM Total Posts: 4 [ # 9 ] In my example the same error occurs. I thought about manually rotatting the camera with camera.rotationX and camera.rotationY But it does not work. here is my code: var cameraRotatorX:Number = stage.width / 2 - mouseX; var cameraRotatorY:Number = stage.height / 2 - mouseY; cameraRotatorY += 0.0+cameraRotatorY/100 ; cameraRotatorX += 0.0+cameraRotatorX/100 ; camera.y = Math.sin( cameraRotatorX / 180 * Math.PI ) * cameraDis; camera.x = Math.sin(cameraRotatorY / 180 * Math.PI) * cameraDis; camera.z = Math.cos(- cameraRotatorX / 180 * Math.PI) * Math.cos(cameraRotatorY / 180 * Math.PI) * cameraDis; // camera.lookAt(new Vector3D( ) ); camera.rotationX =180-cameraRotatorX; camera.rotationY = 180 + cameraRotatorY; does someone know about using camera.rotationZ ?

Problem with lookAt function for Object3D in Away3D 4

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