Thanks... I tried something similar to this but I instantiated the Transform3d with the rotation matrix as one of the constructor's parameters. The API reference says you can do this but it didn't work. I'll try your suggestion (using setRotation) and see if that does the trick.
Oh, one more question... is there an easy way to create a rotation matrix based on a pair of Points or Vectors describing two endpoints? I don't necessarily know the angle for rotations. Sometimes I start with the endpoints. -- John On Sun, 30 Sep 2001, Eric Reiss wrote: > Date: Sun, 30 Sep 2001 13:48:34 -0400 > From: Eric Reiss <[EMAIL PROTECTED]> > Reply-To: Discussion list for Java 3D API <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Subject: Re: [JAVA3D] How to rotate objects? > > This is actually very simple. > > Suppose you already know the TransformGroup for an object you want to > rotate to a specific angle around the X axis. Lets call this Object > TransformGroup JohnTG. > > Transform3D tempT3D = new Transform3D(); > (JohnTG).getTransform(tempT3D); > > Matrix3d someRotationMatrix = new Matrix3d(); > someRotationMatrix .setIdentity(); > someRotationMatrix .rotX(Math.PI/2.0); // This angle is whatever you want > to make it. > > tempT3D.setRotation(someRotationMatrix ); > (JohnTG).setTransform(tempT3D); > > > If you want to rotate around more than just the X axis, then do your rotY > and rotZ in the XYZ order and do it immediately after the rotX method and > before the setRotation method. > > > > > At 01:35 PM 09/30/2001 -0400, you wrote: > >All, > > > >I've run into a problem that neither the Java3d examples or the Sun API > >reference seem to be able to explain to me.... and that is how to perform > >rotation traansforms. All the examples I've seen either use a mouse event > >or an Alpha/Interpolator.... but all I want to do is just create a > >cylinder and rotate it to a specific orientation in three-space. > > > >Sounds pretty simple but I haven't been able to figure it out from the > >tools available. > > > >Now, I will tell you that I have tried creating a Maatrix3d, normalizing > >it and then doing rotX, rotY and rotZ and then pumping that into a > >Transform3d. But this doesn't actually seem to do anything. > > > >Can anyone post some example code or point me to the right place? > > > >-- John > > > >-- > >_____________________________________________________ > > > >John T. Nelson > >President | Computation.com Inc > >mail: | [EMAIL PROTECTED] > >company: | http://www.computation.com/ > >journal of computation: | http://www.computation.org/ > >_____________________________________________________ > >"Providing quality IT consulting services since 1992" > > > >=========================================================================== > >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". > > *********************************************************************** > Eric N. Reiss > MEMS Manager > Swanson Center for Product Innovation > Department of Mechanical Engineering > School of Engineering - University of Pittsburgh > > 3700 O'Hara Street > 647 Benedum Hall > Pittsburgh, Pennsylvania 15261 > Phone: 412-624-9696 > FAX: 412-624-7701 > Email: [EMAIL PROTECTED] > http://www.sigda.org/Eric/ > *********************************************************************** > > =========================================================================== > 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". > -- _____________________________________________________ John T. Nelson President | Computation.com Inc mail: | [EMAIL PROTECTED] company: | http://www.computation.com/ journal of computation: | http://www.computation.org/ _____________________________________________________ "Providing quality IT consulting services since 1992" =========================================================================== 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".
