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Hi Jorge, Everything you describe sounds correct Note that Ugo has just updated his tutorial to include an section on volume rendering with RGBA. That may help. If you can't figure it out, you can send me your program and perhaps a data file so I can run it. 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
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