Thanks, I think I'm beginning to see.
Do I understand this correctly?
There is only one axis of rotation and in order to change the
"apparent" axis of rotation, you need to transform your
RotationInterpolator to the proper orientation.
Does this have any effect on the rest of the scene or does
it just apply to the individual RotationInterpolator. The viewing
axis orientation of the total scene still remains the same (+y top,
+x right, -z into screen), right?
Dave J.
> -----Original Message-----
> From: J. Lee Dixon [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, November 06, 2000 8:51 AM
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] Axis of rotation question
>
> Dave,
>
> Yeah, this one is a bit funny. Think of it this way. The axis of
> rotation starts out as the y-axis. Your "axisOfRotation" will be a
> transform that will move the positive y-axis to your desired rotation
> axis. For example:
>
> // To rotate around positive x-axis, rotate the y-axis by -90 deg about
> Z
> Transform3D axisOfRotation = new Transform3D();
> axisOfRotation.rotZ( Math.toRadians(-90) );
> rotinterp = new RotationInterpolator(myalpha, mytarget, axisOfRotation,
> minimumAngle, maximumAngle);
>
> If instead you wanted to rotate about the positive z-axis, then:
> axisOfRotation.rotX( Math.toRadians(90) );
>
> Hope this helps.
> -Lee
>
> J. Lee Dixon
> SAIC - Celebration, FL
> 407-566-1438
> [EMAIL PROTECTED] AOL: LeeOrlando
>
>
> -----Original Message-----
> From: Jarzabek, David [mailto:[EMAIL PROTECTED]]
> Sent: Monday, November 06, 2000 9:10 AM
> To: [EMAIL PROTECTED]
> Subject: [JAVA3D] Axis of rotation question
>
>
> I'm working my way through the tutorial and I wanted to make
> the YoYo example rotate around the X-Axis rather than the Y-Axis.
> The constructor for the RotationInterpolator class has a rotation
> axis parameter, but it is of class Transform3D, rather than something
> a bit more obvious like a class member defining the axis of rotation.
>
> I was successful in rotating the model so that the ends of the
> yoyo were vertical rather than horizontal, but the axis of rotation
> was still not what I was looking for.
>
> I'm sure the answer is trivial, but I still haven't made the connection.
>
> Thanks, Dave J
>
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