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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Don, I looked into automated export of VisAD displays a bit ago. The quickest way that I found used the package CyberVRML97 (http://www.cybergarage.org/vrml/cv97/cv97java/index.html). Export was easy as all one had to do was created a VRML tree using the VisAD root branch group from a DisplayRendererJ3D instance and then write it out using the cv97 API. When using cv97 with VisAD (as implemented at that time) the issues were: 1) Each node in the scene graph had to have CAPABILITY_ALLOW_READ set. The required changes were implemented in VisAD at one time, but had to be reverted for compatibility with older Java3D releases where the required capabilities didn't exist. 2) The polygon winding orders in the VisAD marching cubes implementation are inconsistent as the polygon normals of the triangle strips appear to alternate pointing towards increasing and decreasing values of the 3d scalar grid. The VRML renderer we used (Cortona) culled polygons based on the winding order and the surfaces would display with alternate polygons culled. VisAD turns off culling so this artifact isn't visible until export. We ended up implementing our own export implementation. If you have specific questions I should be able to help you... Tom Kunicki - Senior Software Engineer Imago Scientific Instruments Corporation 6300 Enterprise Lane Madison, WI 53719 Voice: 608.274.6880 x203 Fax: 608.442.0622 mailto:tkunicki@xxxxxxxxx > Subject: VRML output > > I looked through the archives and found a couple of people > who were investigating outputing the Java3D scene graphs as > VRML. Has anyone done this and if so, are they willing to > share the code? > > Don NOTICE: These communications may contain privileged or other confidential information for the sole use of the designated recipients. If you have received it in error, please advise the sender by reply email and immediately delete the message and any attachments without reviewing, copying or disclosing the contents. ============================================================================== To unsubscribe visad, visit: http://www.unidata.ucar.edu/mailing-list-delete-form.html ==============================================================================
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