Thanks for the suggestion but it still isn't what I am looking for. I too
have modified the picking behaviors and the callback methods to fit my needs.
One other thing that was missing in the SUN implementation is the ability
to set the scaling factor for the mouse when using the picking
behaviors. I had to add fields into the picking behaviors that connected
to the corresponding ones in the mouse behaviors so that I could adjust the
scaling factors in the callback methods.
SUN should have provided a means to do this.
I still want to be able to translate, rotate and zoom from arbitrary
viewpoints and not have the object react as if I am viewing it from the XY
plane normal.
At 10:12 AM 05/15/2000 -0500, you wrote:
>My solution to this problem was to create a method that updated the
>TransformGroup associated with the ViewingPlatform (whereas the MouseRotate,
>etc are generally applied to a geometry related transform). In other words
>I am moving my viewpoint around the geometry, rather than moving the
>geometry in front of a stationary viewpoint. I accomplished this using the
>following code
>
> void UpdateViewTransform()
> {
> file://First we setup a transform for our default
>(az=el=0.0) condition
> Transform3D t3d = new Transform3D();
> Point3d center = new Point3d(0.0,0.0,0.0);
> Point3d eye = new Point3d(zoomTrans,0.0,0.0);
> Vector3d up = new Vector3d(0.0,0.0,1.0);
> t3d.lookAt(eye, center, up);
> t3d.invert();
>
> file://Now create the az/el transform
> Transform3D viewT3D = new Transform3D();
> file://Note that the order of setEuler is roll,pitch,yaw
> viewT3D.setEuler(new Vector3d(0.0, -currentEl, currentAz));
> viewT3D.mul(t3d);
>
> file://Now do any panning transform
> t3d = new Transform3D();
> t3d.setTranslation(new Vector3d(panXTrans,panYTrans,0.0));
> viewT3D.mul(t3d);
>
> TransformGroup viewTG =
>world.getViewingPlatform().getViewPlatformTransform();
> viewTG.setTransform(viewT3D);
> }
>
>I modify the values of currentAz, currentEl, zoomTrans, and the
>pan(XY)Trans, through callbacks from a modified MouseBehavior (modeled after
>the MouseRotate,etc) method. If you look at these methods you will observe
>a MouseBehaviorCallback class. I created my own similar interface which
>includes GetCurrentAz, SetCurrentAz, GetCurrentEl, SetCurrentEl, Zoom, and
>Pan. In the MouseXxxx methods there are scale factors that determine the
>amount of rotation,etc. for a given mouse movement. I modify that value
>each time I zoom so that when I am in close the rotate, pan, and zoom are
>slower than when I am farther away. Also note that in the above routine I
>am using a left handed elevation (thus the negation of the elevation value).
>I hope this helps.
>
>
>John P. Williams
>[EMAIL PROTECTED]
>Voice 850.314.6700
>Fax 850.314.7508
>
>----- Original Message -----
>From: Eric Reiss <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Sunday, May 14, 2000 11:41 PM
>Subject: [JAVA3D] Mouse / picking behaviors and arbitrary views
>
>
> > I was wondering if anyone knew of a better implementation of the picking
> > and mouse behaviors than that provided by SUN for allowing objects to be
> > translated, rotated and zoom from an arbitrary viewpoint other than one
> > normal to the XY plane.
> >
> > When I move to a view that isn't normal to the XY plane and try to
> > translate an object, horizontal and vertical mouse movements only move the
> > object within the XY plane. I want them to move the object in a plane
> > represented by the view (this is the more intuitive approach).
> >
> > Rotations are fixed about the Y and X axis instead of arbitrary axis
>formed
> > by vertical and horizontal components of the view.
> >
> > Likewise, the Zoom is just along the Z axis instead of along a path normal
> > to the arbitrary view.
> >
> > Any help would be greatly appreciated.
> > ***********************************************************************
> > Eric Reiss - http://www.sigda.acm.org/Eric/
> > Email: [EMAIL PROTECTED]
> >
> > SIGDA Internet Server Manager - http://www.sigda.acm.org/
> >
> > Assistant Systems Manager - School of Engineering
> > University of Pittsburgh
> > ***********************************************************************
> >
> >
>===========================================================================
> > To unsubscribe, send email to [EMAIL PROTECTED] and include in the
>body
> > of the message "signoff JAVA3D-INTEREST". For general help, send email to
> > [EMAIL PROTECTED] and include in the body of the message "help".
> >
> >
>
>===========================================================================
>To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
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>[EMAIL PROTECTED] and include in the body of the message "help".
***********************************************************************
Eric Reiss - http://www.sigda.acm.org/Eric/
Email: [EMAIL PROTECTED]
SIGDA Internet Server Manager - http://www.sigda.acm.org/
Assistant Systems Manager - School of Engineering
University of Pittsburgh
***********************************************************************
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff JAVA3D-INTEREST". For general help, send email to
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