Away3D Forum Pixel perfect plane

Karim Beyrouti, Administrator
Posted: 26 March 2012 01:53 PM Total Posts: 30

Hello Forum,

This has been discussed before, however I am having dificulty finding a solution that works with Away 4.0. I am trying to get pixel prefect positioning of a plane, i.e. getting a plane that is 128 x 32 to show up
at those dimensions on the screen. Any pointers ?

Kind regards

Karim Beyrouti, Administrator
Posted: 26 March 2012 03:28 PM Total Posts: 30 [ # 1 ]

Getting closer to solving this one, however it’s not quite there:

Sample: http://kurst.co.uk/samples/pixelprecision/

the SWF is calculating the fieldOfView based on the objects distance from the camera - and setting that to get pixel precision:

var dist    : Number  = Vector3D.distance( planeMesh.position , awayView.camera.position );
    var fieldOfView : Number  = (360 / Math.PI) * Math.atan(awayView.view.height / (2 * dist));
    lens.fieldOfView    = fieldOfView;// lens is a PerspectiveLens 

I would rather solve this to find the object’s Z position rather than changing the FOV, but am a little confused on how to
proceed from here.

Source: http://kurst.co.uk/samples/pixelprecision/src.zip

Thanks

- karim

bardo, Member
Posted: 27 March 2012 02:27 PM Total Posts: 79 [ # 2 ]

i use this

public static function pixelPerfectCameraValue(camera:Camera3D,h:Number  ):Number {
   var h:Number = h;
   var fovy:Number = (camera.lens as PerspectiveLens).fieldOfView*Math.PI/180;
   return  -(h/2) / Math.tan(fovy/2);
  } 

move the object on is back vector with this value

ie:

var positionCamera:Vector3D = Matrix3DUtils.getForward(camera.transform);
   var newPos:Vector3D = new Vector3D(camera.position.x + positionCamera.x * -(Utils3d.pixelPerfectCameraValue(camera, 450)), camera.position.y + positionCamera.y * -(Utils3d.pixelPerfectCameraValue(camera, 450) ), camera.position.z + positionCamera.z * -(Utils3d.pixelPerfectCameraValue(camera, 450))) 

dont know if there is another method, maybe more correct.

Karim Beyrouti, Administrator
Posted: 27 March 2012 03:21 PM Total Posts: 30 [ # 3 ]

Yep - that worked a treat:
http://kurst.co.uk/samples/pixelprecision/pixelperfect.html

updated source for this if it helps anyone:
http://kurst.co.uk/samples/pixelprecision/pixelperfect.zip

Thank you !

bardo, Member
Posted: 27 March 2012 05:07 PM Total Posts: 79 [ # 4 ]

de nada!

Pixel perfect plane Software: Away3D 4.x

Karim Beyrouti, Administrator Posted: 26 March 2012 01:53 PM Total Posts: 30 Hello Forum, This has been discussed before, however I am having dificulty finding a solution that works with Away 4.0. I am trying to get pixel prefect positioning of a plane, i.e. getting a plane that is 128 x 32 to show up at those dimensions on the screen. Any pointers ? Kind regards
Karim Beyrouti, Administrator Posted: 26 March 2012 03:28 PM Total Posts: 30 [ # 1 ] Getting closer to solving this one, however it’s not quite there: Sample: http://kurst.co.uk/samples/pixelprecision/ the SWF is calculating the fieldOfView based on the objects distance from the camera - and setting that to get pixel precision: `var dist : Number = Vector3D.distance( planeMesh.position , awayView.camera.position ); var fieldOfView : Number = (360 / Math.PI) * Math.atan(awayView.view.height / (2 * dist)); lens.fieldOfView = fieldOfView;// lens is a PerspectiveLens` I would rather solve this to find the object’s Z position rather than changing the FOV, but am a little confused on how to proceed from here. Source: http://kurst.co.uk/samples/pixelprecision/src.zip Thanks - karim
bardo, Member Posted: 27 March 2012 02:27 PM Total Posts: 79 [ # 2 ] i use this `public static function pixelPerfectCameraValue(camera:Camera3D,h:Number ):Number { var h:Number = h; var fovy:Number = (camera.lens as PerspectiveLens).fieldOfViewMath.PI/180; return -(h/2) / Math.tan(fovy/2); }` move the object on is back vector with this value ie: `var positionCamera:Vector3D = Matrix3DUtils.getForward(camera.transform); var newPos:Vector3D = new Vector3D(camera.position.x + positionCamera.x -(Utils3d.pixelPerfectCameraValue(camera, 450)), camera.position.y + positionCamera.y * -(Utils3d.pixelPerfectCameraValue(camera, 450) ), camera.position.z + positionCamera.z * -(Utils3d.pixelPerfectCameraValue(camera, 450)))` dont know if there is another method, maybe more correct.
Karim Beyrouti, Administrator Posted: 27 March 2012 03:21 PM Total Posts: 30 [ # 3 ] Yep - that worked a treat: http://kurst.co.uk/samples/pixelprecision/pixelperfect.html updated source for this if it helps anyone: http://kurst.co.uk/samples/pixelprecision/pixelperfect.zip Thank you !
bardo, Member Posted: 27 March 2012 05:07 PM Total Posts: 79 [ # 4 ] de nada!

Pixel perfect plane

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