thanks for your reply. yes, i get your point, doing a direct manipulation through a Transform3D acting on the specific TransformGroup of a given particle is certainly faster. especially if you present every particle as a single point. as you say then one just updates the translational component of the TransformGroup.
still, i am not sure how to do this if you do not represent your particle as a point, but have all your particles connected in a graph-like (or bond-like) manner using pair-wise LineArray's. since your Shape3d is now a line, i think one would need to separately rotate, translate and possibly scale the line. or am i missing the point? the way i solved this for now is to replace the original Shape3D with the new one containing a line that represents the next positions. this is faster than replacing the complete BranchGroup, but still rather slow. Is there be a faster way to rotate, translate and scale a given LineArray, possibly through a Transform3D, which would do the complete operation automatically? thanks m On Mon, 25 Aug 2003, Lewis Walker wrote: > You just want to perform animation by moving the particle, is that > correct? > That's what TransformGroups are for. A TransformGroup specifies the > position, rotation etc. of its children. So just parent your particle > with a TransformGroup, and for every frame, set the translation > component of the Transform3D of the TransformGroup equal to the new > position read in from your file. > > That is how animation is intended. Effectively changing the structure of > the Scene Graph each frame is VERY expensive, and should be avoided! > > Lewis. > > -----Original Message----- > From: Discussion list for Java 3D API > [mailto:[EMAIL PROTECTED] On Behalf Of Mika Kastenholz > Sent: 25 August 2003 09:26 > To: [EMAIL PROTECTED] > Subject: [JAVA3D] fast SceneGraph update? > > > what is the fastest way to update a SceneGraph? > > imagine reading in particle position frames from a coordinate file and > displaying them as balls or connected lines so as to obtain a continuous > trajectory. the scene itself should be able to allow for rotation and > translation while updating the positions. > > currently, i am simply creating a new BranchGroup with the new positions > and using the setChild() method to replace the old BranchGroup. this > works, is however very slow once you need to traverse through a number > of Nodes/TransformGroups/BranchGroups by using the getChild() method. in > addition, the rotation/translation gets jerky even though everything > runs as a separate thread. is there a faster way of doing this? > > thanks in advance > m > > ======================================================================== > === > 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 > 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 of the message "signoff JAVA3D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
