Right first query. I've read some archived posts concerning how to display more than one PolygonAttribute style at a time i.e. a filled poly with the edges also visible. I would like something simliar whereby I see a wireframe with the points/vertices also visible so I can select the points for dragging. Some alternatives I have seen are: 1. Some people have suggested duplicating the shape with one for each of the PolygonAttribute styles. 2. Another possibility would involve drawing a small sphere/cube at the position of the vertex ala the IntersectTest demo available with Java3D. 3. Drawing a 2D image over the canvas3D at the vertex point using J3DGraphics2D.
Any thoughts on these methods? I think the second one is probably the way to go. > > From: David Rush <[EMAIL PROTECTED]> > Date: Fri 22/Mar/2002 14:46 CET > To: [EMAIL PROTECTED] > Subject: Re: [JAVA3D] On-the-fly object editing > > This all sounds very promising, but I may need to come back with more queries. Ta >very much. > > David > > > > > From: Daniel Selman <[EMAIL PROTECTED]> > > Date: Fri 22/Mar/2002 01:39 CET > > To: [EMAIL PROTECTED] > > Subject: Re: [JAVA3D] On-the-fly object editing > > > > David, > > > > Some pointers for you. > > > > 1. Yes, you can achieve this within Java 3D, and using retained (scenegraph) > > mode. > > > > 2. You need to set the appropriate READ and WRITE capability bits on the > > Shape3D and GeometryArrays for your Geometry. > > > > 3. Then use a Picking Behavior with GEOMETRY-based picking. Once you have a > > PickResult you can query for the nearest vertex etc. You may want to think > > about rubber-banding a group of vertices... > > > > 4. Once you've selected some vertices you will need to go into "drag mode". > > While the drag is happening you will need to update the GeometryArray with > > the positions of the new vertices. You may want to experiment with setting > > BY_REFERENCE for your GeometryArrays so that you don't have to copy the > > entire vertex position array to-and-fro while the drag is happening. > > > > Check out the sample code from my book for some starting points > > (particularly building blocks for the behaviors you will need to write). > > > > You might also want to look at the skin-and-bones animation example on the > > www.j3d.org website, it uses dynamic geometry updates for the animation. > > > > My particle code (also on www.j3d.org, in the CVS repository) uses > > BY_REFERENCE geometry updates extensively. > > > > Best of luck. Let us know how you get along, and if you can make the > > "PickingDeformationBehavior" general purpose, and share it with us, all the > > better! > > > > Sincerely, > > > > Daniel Selman > > > > Author - "Java 3D Programming" > > http://www.manning.com/selman > > > > -----Original Message----- > > From: Discussion list for Java 3D API > > [mailto:[EMAIL PROTECTED]]On Behalf Of David Rush > > Sent: Thursday, March 21, 2002 4:34 PM > > To: [EMAIL PROTECTED] > > Subject: On-the-fly object editing > > > > > > Hi there, > > > > This is my first post to this list so i hope you guys can help me out. For > > my final year project i am implementing a 3D object editor in Java3D. At > > the mo it can load objects from various file formats using the available > > loaders, and allows for editing of materials, lights, textures etc. What i > > am really looking to implement is the ability to dynamically edit the > > objects by clicking and dragging on the individual vertices. I am not > > exactly sure how to go about this yet, I have some ideas but i'm not sure if > > they are within the limitations set by Java3D. Does anybody have any > > theories on how i might achieve this? I also have a hunch that to do this > > would involve using immediate/mixed-mode rendering but i'm not sure how this > > would fit in with the architecture of my program at the moment. > > > > Thanks for any help you can give, > > > > David Rush > > > > =========================================================================== > > 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". > > =========================================================================== 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".
