Comments on: getting 2d coords from displayobject3d

By: jkozniewski

jkozniewski — Thu, 12 Jun 2008 14:22:36 +0000

Hi…
@Slaymantis
I’ve recently wrote a method to do the reverse ( 2d->3d coords ):

private function setScreenCoords( do3d:DisplayObject3D, camera :CameraObject3D, x:Number, y:Number ) : void {

var persp:Number = (camera.focus * camera.zoom) / (camera.focus + do3d.view.n34);

do3d.x = x / persp;
do3d.y = -y / persp;

}

By: Slaymantis

Slaymantis — Wed, 21 May 2008 18:11:32 +0000

how would you write a function convertTo3DCoords then.
so you can input 2d coords and get them in relation to the 3d coords? I tried the .screen fix but doesnt seem to move the object around

By: Maciek

Maciek — Wed, 07 May 2008 01:28:52 +0000

To make this work again open this file branches\GreatWhite\src\org\papervision3d\objects\DisplayObject3D.as

Then go to empty line 756 and put this extra line of code:

calculateScreenCoords( renderSessionData.camera );

right above this two lines:

var screenZs :Number = 0;
var children :Number = 0;

By: Joshua Mostafa

Joshua Mostafa — Mon, 28 Apr 2008 23:16:00 +0000

Because it didn’t work - at least against the bleeding edge of Great White in SVN at my last checkout.

By: Mike Manh

Mike Manh — Mon, 28 Apr 2008 17:25:20 +0000

Why not use object.screen.x and object.screen.y?

By: barbara

barbara — Thu, 17 Apr 2008 14:35:23 +0000

Hi!
Just for info, if your viewport doesn’t fill the whole stage, it’s just a matter of adding the viewport.width/2 and the viewport.height/2 to the Point’s x and y coordinates respectively.
Cheers!

By: Sean

Sean — Tue, 08 Apr 2008 20:17:06 +0000

Great find! Now, do you happen to know how to reverse it?

Starting a pv3d project where I’m going to have to be jumping back and forth between 3d and MCs, and thought I would ask before spending the better part of the day figuring out how to reverse it.

If not, I’ll share my results (when I figure it out). Thanks