First, let me assume you are talking about Max's 'Multi/Sub Object' material. (If you are simply talking about a 'Composite' material type (a way to export multitexture data), then just multiple TextureUnitState's would do.)
So, what we need in this case is what you're talking sort of talking about - using the same geometric data and a seperate material. What I would do (and will be doing - Multi/Sub support is an important feature in my 3dsmax exporter) is create another class that keeps track of all these "split" shape3d's in an extended Shape3D class (MultiShape3D or something) - which would also implement GeometryUpdater. This class' updateData() method will also call all contained shape3d's GeometryArray's updateData() method in turn. Since you will want all transforms between the split geometry to be identical (to avoid surface tearing and such) this new class can be simply added as a child of a transform and all the shape3d's within will be thus transformed. That's my 3 cents. http://www.geocities.com/Psionic1981 for an early, early demo of my upcoming java3d based game. Chris Forrester. Btw. I've never tried it personally, but it seems from all I've read that Indexed(Quad/Tri/TriStrip)GeometryArray is a much worse choice than (Quad/Tri/TriStrip)GeometryArray, since java3d must un-indexify the data before sending it to the card. Or conversely, if you use the beta j3d, the USE_COORD_INDEX_ONLY combined with indexed arrays should be quick. >From: Michael Nischt <[EMAIL PROTECTED]> >Reply-To: Discussion list for Java 3D API <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] >Subject: Re: [JAVA3D] Geometry Update >Date: Mon, 1 Apr 2002 23:06:19 +0200 > >Hi Doug, > > > This will work in the current implementation, but it is technically > > one of those "undefined behavior" cases. > >in case david's suggestion isn't safe for the future - I hope there will be >an 'official' way, beause I don't know how to handle 3DSMax's >MutiMaterials >of a mesh instead >and I need to share the vertices for effiecient vertex blending.. > >greetings >-Michael Nischt > > > > > > > Doug Twilleager > > Java 3D Team > > Sun Microsystems > > > > >Subject: Re: [JAVA3D] Geometry Update > > >To: [EMAIL PROTECTED] > > >MIME-version: 1.0 > > >Delivered-to: [EMAIL PROTECTED] > > > > > >Ooh this is a good one! > > > > > >Since it is considered illegal to update the vertices of by-ref >geometry > > >outside of a geometry updater it would be "bad" to do as you have >suggested. > > >However, I am not sure if it would actually be a problem if you do this >from > > >a behavior since I would expect that both geometry array's would >already >be > > >winging their way to the card. But if you wanted to play it safe, try > > >making a dummy updator that does nothing but invoke the other updater >on >the > > >other geometry array. This should lock both at the same time. You >could > > >even build a generic class that could manage "shared by-ref geometry" >to > > >provide this locking. > > > > > >Dave Yazel > > > > > >-----Original Message----- > > > > > >From: Michael Nischt [mailto:[EMAIL PROTECTED]] > > >Sent: Monday, April 01, 2002 1:16 PM > > >To: [EMAIL PROTECTED] > > >Subject: [JAVA3D] Geometry Update > > > > > > > > >hello everyone, > > > > > >I have an question concerning geometry-update, with shared vertices: > > > > > >Two (Indexed)GeometryArrays (BY_REFERENCE) share the same vertices >(with > > >different indices), because some parts have different Materials. > > >I decided to put the same cordinate/normal arrays in both and I update >one > > >with a GeometryUpdater, and both were updated correct. :-) > > > > > >But I am wondering if this legal, because the second one has no > > >GeometryUpdater ? do I have to put an dummy updater for the second one >? > > > > > >greetings > > >-Michael Nischt > > > > > >btw. a Test application is attached for better understanding > > > > > > > > > > > > > >=========================================================================== > > 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". _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.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".
