David Thompson:
|> If you have some arbitrary field with colors and a colormap, and you
|>want to convert it to field with direct colors, what's the simplest way to
|>do that? Map comes to mind, but I clearly don't want interpolation.
|>
|> Is there a module for this I've forgotten about?
|
|I would assume that Lookup could be used quite easily, but its ins
|and outs always get me and takes me quite a while to remember how to
|use it.
Lookup works well:
cmap = Extract ( field, "color map" );
#cmap_field = Construct( {[0]}, {[1]}, 256, cmap );
field2 = Mark ( field, "colors" );
do_it = Lookup ( field2, cmap, "colors" );
If the "color map" is fed into Lookup as a naked array (cmap), it's about
as fast as using Color with a colormap field (cmap_field) -- 4 seconds. If
you feed cmap_field into Lookup though, it takes quite a bit longers (30
seconds) for some reason.
Thanks David. I prefer the Lookup method since the speed is comparable and
you don't have to build the dummy field to get it to work.
Randy
--
Randall Hopper (mailto:[EMAIL PROTECTED])
Lockheed Martin Operation Support
EPA Scientific Visualization Center
US EPA N127-01; RTP, NC 27711
