> and then ingested by the netCDF backend to VisAD, then it would appear
> as the following FlatField:
>
> recnum -> (x, y, z, u, v, w)
>
> which is probably not what you want. Undoubtably, you want a VisAD
> FlatField like the following:
>
> (x, y, z) -> (u, v, w)
>
> Unfortunately, the "plain" netCDF conventions don't carry enough
> semantics with them to distinguish independent variables from dependent
> ones, which is why the first form of FlatField is created.
However, a FlatField with MathType:
(recnum -> (x, y, z, u, v, w))
can still be displayed my mapping x -> XAxis, y -> YAxis,
z -> ZAxis, then perhaps u -> Flow1X, v -> Flow1Y, w -> Flow1Z
(this will make little vectors at each x, y, z location) or
some other set of mappings.
If you want to do something like contouring u, v and w values,
then you need a FlatField with MathType:
(x, y, z) -> (u, v, w)
You could construct such a FlatField like this:
FlatField field = ... // this has type (recnum -> (x, y, z, u, v, w))
float[][] values = field.getFloats();
RealTupleType range
(RealTupleType) ((FunctionType) field.getType()).getRange();
RealTupleType domain = new RealTupleType(
(RealType) range.getComponent(0),
(RealType) range.getComponent(1),
(RealType) range.getComponent(2));
RealTupleType new_range = new RealTupleType(
(RealType) range.getComponent(3),
(RealType) range.getComponent(4),
(RealType) range.getComponent(5));
float[][] samples = new float[3][];
samples[0] = values[0];
samples[1] = values[1];
samples[2] = values[2];
// WARNING: the Delaunay tetrahedralization used by this
// Irregular3DSet constructor is slow for large numbers of samples
Set set = new Irregular3DSet(domain, samples);
FlatField new_field
new FlatField(new FunctionType(domain, new_range), set);
float[][] new_values = new float[3][];
new_values[0] = values[3];
new_values[1] = values[4];
new_values[2] = values[5];
new_field.setSamples(new_values);
There may be a few bugs in this, but its the general idea.
Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
whibbard@xxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
