Hi Chris, We are dealing with proteins here which is much complex and compact shape than DNA. It is very much possible that a user zooms out to a level where he can view the whole molecule on the screen. I agree to you that some of the sphere will be at such a scale where they are equivalent to a particle system. the thing is, how much ever small a sphere is, it has a different look then a 2D particle. There are tools in the market(ofcourse not in Java3D) which are capable of rendering such a large number of spheres, so I think we should be able to do it in Java3D as well.
cheers, Nitin > -----Original Message----- > From: Chris Forrester [mailto:[EMAIL PROTECTED]] > Sent: Thursday, April 18, 2002 11:57 PM > To: [EMAIL PROTECTED] > Subject: Re: [JAVA3D] Spheres > > > Yeah, i'm a bit confused here - why do people need so many > spheres? I'm > sorry, but it just seems like inefficient program design to > need 10,000 > seperate spheres drawing in a scene at once. At this scale, > it seems like a > particle system, and i'm pretty sure you could get huge > speedups by not > having to go through a full transformgroup stack each frame > for each of your > 10,000 spheres. > > I mean, if it's for dna analysis or something just build a > trianglestrip of > all the spheres in the chain, and attach all of these into a single > transform. > Java3d will technically do this already, but you need to > compile to get this > working, and that means no more modifications to the group > afterwards unless > you detach/reattach, etc. > > It's just one of the maxims of efficient coding - > "If it takes too much time, you're doing it wrong" > > > >From: "Nitin.Jain" <[EMAIL PROTECTED]> > >Reply-To: Discussion list for Java 3D API > <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] > >Subject: Re: [JAVA3D] Spheres > >Date: Wed, 17 Apr 2002 14:10:13 +0530 > > > >Hi, > > > >By default the Spheres share the geometry. You can do it > your self as well > >by taking the geometry out of first sphere and create new > Shape3D objects > >using this geometry and the appearance you like. > >Sphere sp1 = new Sphere(radius, ap); > >Geometry geom = sp1.getShape().getGeometry(); > >Shape3D sp2 = new Shape3D(geom,ap); > >Shape3D sp3 = new Shape3D(geom,anotherAp); > > > >the crux of the problem, "lot of Sphere", lies in the > number...can you > >specify how many spheres u need to draw? > > > > > >nitin > > > -----Original Message----- > > > From: Raśl [mailto:[EMAIL PROTECTED]] > > > Sent: Wednesday, April 17, 2002 3:19 AM > > > To: [EMAIL PROTECTED] > > > Subject: [JAVA3D] Spheres > > > > > > > > > Hello to everybody! > > > > > > > > > I have to create a lot of spheres with the > > > com.sun.j3d.utils.geometry.Sphere class. > > > > > > I want to the spheres share their geometry but not the appearance. > > > > > > > > > if I use that ... > > > > > > > > > Sphere sp1 = new Sphere(radius, ap); > > > Sphere sp2 = new Sphere(radius, ap); > > > Sphere sp3 = new Sphere(radius, anotherAp); > > > > > > which spheres are sharing geometry?? > > > > > > Thanks a lot. > > > > > > ============================================================== > > > ============= > > > 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". > > > > > ------------------------ > > Chris Forrester > > http://www.geocities.com/Psionic81 > > > _________________________________________________________________ > Chat with friends online, try MSN Messenger: http://messenger.msn.com > > ============================================================== > ============= > 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".
