NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
VisAD now includes volume rendering - that is rendering a 3-D Field as a transparent fog. This is only applied for Fields (generally FlatFields) whose domain Set is a Linear3DSet, when the 3 domain RealTypes are mapped to XAxis, YAxis and ZAxis, when range values are mapped only to color, Alpha and RangeSelect, and when texture mapping is enabled and point mode is disabled in the GraphicsModeControl (these are the defaults). Note that unless some value if mapped to Alpha in such a way that most "outer" volume samples are pretty transparent, the volume image will be a boring solid block. visad/examples/Test61.java illustrates how to use volume rendering. If you want volume rendering for a FlatField whose domain Set is not a Linear3DSet, you can use the FlatField's resample method to resample the FlatField's values to a Linear3DSet. Experience with Vis5D and other systems has shown that volume rendering can make interesting images for publication but is less useful for day-to-day data analysis. 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
visad archives: