[Papervision3D] How to apply quaternions to a 3DObject

[Andy Zupko]

To use quaternions you simply need to multiply them back into your  
objects transformation matrix.  Something like this:

var rotation:Quaternion = Quaternion.createFromAxisAngle(rotAxis.x,  
rotAxis.y, rotAxis.z, radians);
rotation.normalize();
			
do3d.transform.calculateMultiply3x3(rotation.toMatrix(),  
do3d.transform);

createFromAxisAngle simply handles the sin/cos math for you, but you  
can manually set your xyzw in the constructor as well.

You only need to do a 3x3 transform since you aren't using them for  
translation (if you need help with that just ask - I have been having  
a serious love affair with quaternions as of late).

You can see how to use it more fully at http://blog.zupko.info/? 
p=143.  Check the rollMe function in the source.

hope that helps

-andy


On Jul 7, 2008, at 2:00 AM, AngelicD wrote:

>
> Hi, basically i just need to rotate a 3d object such as a Plane,  
> using a
> quaternion, that is i have the x,y,z,w values and i need to apply it  
> to the
> 3d object.
>
> Don't seem to be able to figure out how to apply it directly to the  
> object,
> I can do rotationX, rotationY, rotationZ fine (pitch, yaw, roll) but  
> not
> directly through quaternions.
>
> Please Help,
>
> Thanks
>
> -- 
> View this message in context: http://www.nabble.com/How-to-apply-quaternions-to-a-3DObject-tp18310482p18310482.html
> Sent from the Papervision3D mailing list archive at Nabble.com.
>
>
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