Caue
Thanks for the haXe port, I think for absolute and relative rotational
globe movement quaternion's although heavy are the way to go. I sent
this to the sandy list thanks for porting Ralph's code to haXe hope to
find time to try using it with my proxy display object approach.
Cheers
;j
Begin forwarded message:
Subject: Re: [Sandy] arcball haxe?
Ralph
Re: flash 3d engines arcBall very simple approach using Ralph's code.
I started to think about how to port it to an engine, but then
realized it was far simpler to use a dummy DisplayObject3D and pass
across the quaternion to the 3d objects matrix, ideally routing the
mouse events from the 3D object, so some tweaks would be needed but
setting the _alpha of the BoxSprite is a quick way to test my
initial test suggests...
So the main code mod is to store the drag _quaternion so I changed
this class...
public function dragTo(vector:Vector3D):void
{
var v:Vector3D = startVector.crossProduct(dragVector);
dragQuat.x = v.x;
dragQuat.y = v.y;
dragQuat.z = v.z;
dragQuat.w = startVector.dotProduct(dragVector);
QuaternionUtil.multiplyQuats(dragQuat, startQuat, newQuat);
_quaternion.x = -newQuat.x;
_quaternion.y = -newQuat.y;
_quaternion.z = newQuat.z;
_quaternion.w = newQuat.w;
transformComponents[1] = newQuat;
_displayObject.transform.matrix3D.recompose(transformComponents,
Orientation3D.QUATERNION);
}
For some reason I had to negate x and y that might have been for the
globe I was using?
Then I added a getter that you could call every frame.....
public function get
matrix3D():org.papervision3d.core.math.Matrix3D
{
return _quaternion.matrix;
}
can be set as.... _sphere.transform = arcBall.matrix3D;
But in Sandy it would probably be like
public function get matrix3D():sandy.core.data.Matrix4
{
return QuaternionMath.getRotationMatrix( _quaternion );
}
can be set as.... _sphere.matrix = arcBall.matrix3D;
And in Away....
public function get matrix3D():away3d.core.math.Matrix3D
{
return Matrix3D.quaternion2matrix( _quaternion );
}
can be set as.... _sphere.transform = arcBall.matrix3D;
Hope to try in haxe in the future as Caue ( Thanks :) ) has
kindly changed the syntax over on Ralph's code over on the away3d
list, I am not sure if you can use native quaternions on the
Away3DLite engine but that would be very interesting if you can.
Hopefully this approach will prove useful to anyone trying to mix
dragging and geolocation onto a single globe. Now if anyone can
suggest the best way to implement tweening and some momentum -
slurps and an array for average speed come to mind... or maybe I can
just tween but should not specify tween engine.
I have only tested the concept on papervision and for the other
engines please check I have read the docs properly, I do aim to try
them but not at mo.
cheers
;j
On 15 Feb 2010, at 12:09, Ralph Hauwert wrote:
Hey Justin,
The source is there to be used, so if you see a chance to port it,
that would be great. It's not much code in any case, that being
said : it's not meant for any engine, but could be easily ported to
do so ?
Regards,
Ralph.
On Feb 13, 2010, at 7:09 PM, Justin Lawerance Mills wrote:
Hi
Has arcball
http://www.unitzeroone.com/blog/2009/09/08/source-better-flash-10-3d-interaction-arcball/
been ported to haXe yet or should I give it a go, I presume it
would be engine agnostic? Wanted to look at using with haxe
away3Dlite and sandy3D with moving across some zupko pv3d
geolocation code.
Cheers
;j
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