Hi Vladimir, > Some months ago you told me that it was impossible > to create an offscreen DisplayImplJ3D (because of Java3D). > > Does the new version of java3D allow it? Yes. Our plan is to use Java3D classes, constructors and methods that are specific to version 1.2.1 via reflection so that our code will compile even for those folks who have earlier versions of Java3D installed. However, in the case of off screen rendering we discovered a situation that Java reflection cannot handle. Specifically, our VisADCanvasJ3D class extends Canvas3D in order to override its postSwap() and renderField() methods, but then for off screen rendering VisADCanvasJ3D must invoke the Canvas3D constructors directly via "super(...)" rather than via reflection. This will cause a compile error on a machine without Java3D version 1.2 or later installed. So our new VisADCanvasJ3D.java has a constructor for off screen rendering that throws an Exception rather than working, and the Exception directs you to comment-out some of its code and uncomment some other code to actually get off-screen rendering. I have attached a offscreen.jar file containing source for DisplayImplJ3D.java, DisplayRendererJ3D.java and VisADCanvasJ3D.java which you can unpack and compile in your visad/java3d directory to get off screen rendering. However, you must first edit VisADCanvasJ3D.java to comment-out some code in its off screen constructor and uncomment some other code in that constructor. Sorry for the inconvience, but we try hard to make sure our code is easy for everyone to compile. The main() method of VisADCanvasJ3D.java is an example of using off-screen rendering in a DisplayImplJ3D. Cheers, Bill ---------------------------------------------------------- Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706 hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738 http://www.ssec.wisc.edu/~billh/vis.html
Attachment:
offscreen.jar
Description: application/java-archive
visad archives: