Hi there,
I've got some radar data in my visad display, which I am overlaying
over a filled in map and some other stuff. The radar data is from
a McIDAS ADDE image server.
The bad bit is that a large black box surrounds the small amounts
of rain (radar data).
So what I want to do is set 0 values in the radar data to be
transparent.
This is something along the lines of mapping radarValue to ALPHA,
but not quite, as I don't want a linear relationship.. I want to
define my own function (in loose language). This seems to be
possible with mapping samples to colours, where you get your mouse
and choose the R, G and B intensities for that sample, on a
contiguous sample space thingy.
Can I do this for alpha? How do I do it programatically? I don't
want the user having to drag his mouse around just to set 'no rain'
to be transparent.
thanks in advance,
Andrew.
--
Andrew Donaldson
Email: A.Donaldson@xxxxxxxxxx Bureau of Meteorology
Phone: +61 3 9669 4537 P.O. Box. 1289K/150 Lonsdale St,
Fax: +61 3 9669 4128 Melbourne, Australia.
