> Thanks for your help -- moving to the gridded set works great, except for
> a couple of things.
>
> Trying to resample the FlatField over the newly created domain (to change
> the z-axis value of the horizontal slice) creates the following exception:
>
> visad.SetException: Gridded3DSet.valueToGrid: ManifoldDimension must be 3
> at visad.Gridded3DSet.valueToGrid(Gridded3DSet.java:686)
> at visad.GriddedSet.valueToInterp(GriddedSet.java:319)
> at visad.FlatField.resample(FlatField.java:3350)
> at sennev.SEView1b.setCDLevel(sennev/SEView1b.java:205)
This Exception indicates that the domain Set of your
FlatField has domain dimension less than 3 (e.g., 2).
Your original volume data should be a FlatField whose
domain dimension = 3, and your Set argument to this
FlatField's resample() method should have manifold
dimension = 2. The resample method should return a
FlatField whose domain Set has manifold dimension = 2.
> This is not a severe problem as I am able to simply recreate the flatfield
> without any memory or performance problems.
>
> The second issue is that using the gridded 3D set creates a grid of points
> to make up the horizonal slice, whereas we are intending a 'solid',
> continuous surface that is also transparent (using the Display.Alpha
> scalar map). I can make the surface appear continuous by increasing the
> point size until the entire plane is filled, although zooming in to the
> display still makes the gaps between points apparent, but the alphaMap
> seems to have no effect of making the surface transparent with the 3D set,
> which worked previously using the 2D set mapped to a value on the Z-Axis.
This is strange, and may be because of something about
your MathType and ScalarMaps. If you have a FlatField
whose domain Set is a Gridded3DSet with manifold dimension
= 2 (the result of the resample() call above), then with
proper ScalarMaps your display should be a 'solid' surface,
possibly transparent.
> | ____________
> | / /
> | / / <--- transparent, solid
> | / . /
> |/__:_________/
> | /
> | /
> |/
> /_____________
Cheers, Bill
